{"id":301,"date":"2023-07-06T16:09:27","date_gmt":"2023-07-06T16:09:27","guid":{"rendered":"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/"},"modified":"2023-07-06T16:09:27","modified_gmt":"2023-07-06T16:09:27","slug":"discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti","status":"publish","type":"post","link":"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/","title":{"rendered":"Discussione di sistemi di equazioni utilizzando il metodo gaussiano"},"content":{"rendered":"<p>In questa sezione vedremo <strong>come discutere e risolvere un sistema di equazioni con il metodo di Gauss-Jordan<\/strong> . Cio\u00e8, determinare se si tratta di un sistema compatibile determinato (DCS), un sistema compatibile indeterminato (ICS) o un sistema incompatibile. Inoltre, troverai esempi ed esercizi risolti per poter praticare e assimilare perfettamente i concetti.<\/p>\n<p> Per capire cosa spiegheremo dopo, \u00e8 importante che tu sappia gi\u00e0 come risolvere un sistema utilizzando il <a href=\"https:\/\/mathority.org\/it\" target=\"_blank\" aria-label=\"undefined (abre en una nueva pesta\u00f1a)\" rel=\"noreferrer noopener\">metodo di Gauss<\/a> , quindi ti consigliamo di dare un&#8217;occhiata prima di continuare.<\/p>\n<h2 class=\"wp-block-heading\"> Sistemi compatibili determinati con il metodo di Gauss<\/h2>\n<p class=\"has-background\" style=\"background-color:#dff6ff\"> Finch\u00e9 lo \u00e8 l&#8217;ultima riga della matrice gaussiana<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e51d504887586898a4b88863a128c8e2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{(0 \\ 0 \\ n \\ | \\ m)}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"85\" style=\"vertical-align: -5px;\"><\/p>\n<p> , Essere<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"n\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6b41df788161942c6f98604d37de8098_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"m\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"15\" style=\"vertical-align: 0px;\"><\/p>\n<p> due numeri qualsiasi, questo \u00e8 un <strong>SCD<\/strong> (System compatibile determinato). Pertanto, il sistema <strong>ha una soluzione unica<\/strong> .<\/p>\n<p> La stragrande maggioranza dei sistemi sono SCD.<\/p>\n<h3 class=\"wp-block-heading\"> Esempio:<\/h3>\n<p> Ad esempio, abbiamo questo sistema:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bab5d5823e45833aa691a3510a2a23eb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} 3x+2y-z=1 \\\\[2ex] 3x+8y+z=1\\\\[2ex] 6x+4y-z=-1 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"157\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> La cui matrice espansa \u00e8:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-1f8daea11edeedfd6b86bb251fe19032_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} 3x+2y-z=1 \\\\[2ex] 3x+8y+z=1\\\\[2ex] 6x+4y-z=-1 \\end{array} \\right\\}} \\ \\longrightarrow \\ \\left( \\begin{array}{ccc|c} 3 &amp; 2 &amp; -1 &amp; 1 \\\\[2ex] 3 &amp; 8 &amp; 1 &amp; 1 \\\\[2ex] 6 &amp; 4 &amp; -1 &amp; -1 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"364\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Per risolvere il sistema dobbiamo operare sulle righe della matrice e convertire a 0 tutti gli elementi sotto la diagonale principale. Quindi dalla seconda riga sottraiamo la prima riga e dalla terza riga sottraiamo la prima riga moltiplicata per 2:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d68ac25745ddc71d1e7f55f68dd4ea7a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}  3 &amp; 2 &amp; -1 &amp; 1 \\\\[2ex] 3 &amp; 8 &amp; 1 &amp; 1 \\\\[2ex] 6 &amp; 4 &amp; -1 &amp; -1 \\end{array} \\right) \\begin{array}{c}   \\\\[2ex] \\xrightarrow{f_2 -f_1}    \\\\[2ex] \\xrightarrow{f_3 -2f_1} &amp; \\end{array} \\left( \\begin{array}{ccc|c}   3 &amp; 2 &amp; -1 &amp; 1 \\\\[2ex] 0 &amp; 6 &amp; 2 &amp; 0 \\\\[2ex] 0 &amp; 0 &amp; 1 &amp; -3  \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"385\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Una volta che tutti i numeri sotto la diagonale principale sono 0, torniamo a trasformare il sistema in forma di equazione:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4457f1b034e72c6945bfe609eff52b9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 3 &amp; 2 &amp; -1 &amp; 1 \\\\[2ex] 0 &amp; 6 &amp; 2 &amp; 0 \\\\[2ex] 0 &amp; 0 &amp; 1 &amp; -3 \\end{array} \\right) \\ \\longrightarrow \\ \\left. \\begin{array}{r} 3x+2y-z=1 \\\\[2ex] 6y+2z=0\\\\[2ex] 1z=-3 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"357\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Quindi questo sistema \u00e8 <strong>SCD<\/strong> , poich\u00e9 la matrice \u00e8 spostata e l&#8217;ultima riga \u00e8 del tipo<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5d701f6e0afb7579229228d226ee2186_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(0 \\ 0 \\ n \\ | \\ m)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"85\" style=\"vertical-align: -5px;\"><\/p>\n<p> . Pertanto lo risolviamo come sempre: eliminando le incognite dalle equazioni dal basso verso l&#8217;alto.<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0c5e90a86787314220c31ecd60d6f199_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1z=-3\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"64\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-208c30aafe1c4928acff3cce03097853_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"z = \\cfrac{-3}{1}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"66\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-67c7c1bd6ec188bc7f07448caa4fb8e6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{z=-3}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"56\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p>Ora che conosciamo z, inseriamo il suo valore nella seconda equazione per trovare il valore di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0af556714940c351c933bba8cf840796_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: -4px;\"><\/p>\n<p> : <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-1db2032db54c788fd661ffa5111bf6b2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"6y+2z=0\\ \\xrightarrow{z \\ = \\ -3} \\ 6y+2(-3)=0\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"287\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-131539e858428b6f26babc9730564d48_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"6y-6=0\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"81\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ee31c7e143e7eebbe4f91b706e908a94_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"6y=6\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"51\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5283f114522b33a4ac33f83cd7b40124_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=\\cfrac{6}{6}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"44\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5489dac6d2be260d4a09edf4813fa93b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{y=1}\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"41\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> E infine facciamo lo stesso con la prima equazione: sostituiamo i valori delle altre incognite e risolviamo<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ede05c264bba0eda080918aaa09c4658_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> : <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d5505444d34955415e012a46af45f09b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"3x+2y-z=1 \\ \\xrightarrow{y \\ = \\ 1 \\ ; \\ z \\ = \\ -3} \\ 3x+2(1)-(-3)=1\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"416\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-65525763652f9a055c86603030aec3fe_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"3x+2+3=1\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"112\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-28feb5b7617223f938a89688d2e12037_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"3x=1-2-3\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"113\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-be5c4a85a1f5bd3fed2fe2f669a32357_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"3x=-4\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"66\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bf1c9bbd516dc5ab91aebc6a04b12ead_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=\\cfrac{-4}{3}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"67\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-176fc9e917ed897eefe381de76f1fe4d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x= -}\\cfrac{\\bm{4}}{\\bm{3}}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"58\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> La soluzione del sistema di equazioni \u00e8 quindi:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-42de799d301318c37cbb28213dba5bf6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x= -}\\cfrac{\\bm{4}}{\\bm{3}} \\qquad \\bm{y=1} \\qquad \\bm{z=-3}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"227\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"> Sistemi incompatibili secondo il metodo di Gauss<\/h2>\n<p class=\"has-background\" style=\"background-color:#dff6ff\"> Quando nella matrice di Gauss abbiamo una riga con tre 0 di seguito e un numero<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b7185fdc91d65f5980afc39d3554b074_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{(0 \\ 0 \\ 0 \\ | \\ n)}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"78\" style=\"vertical-align: -5px;\"><\/p>\n<p> , \u00e8 un <strong>IS<\/strong> (Sistema Incompatibile) e, pertanto, il sistema <strong>non ha soluzione<\/strong> .<\/p>\n<h3 class=\"estil_titol_H3 wp-block-heading\"> Esempio:<\/h3>\n<p> Ad esempio, immagina che dopo aver operato con la matrice gaussiana di un sistema, ci ritroviamo:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-defe65fa616eff800314ebc6dc6f552b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 4 &amp; 1 &amp; -1 &amp; 0 \\\\[2ex] 0 &amp; 3 &amp; 1 &amp; -1 \\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 2 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"149\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Come l&#8217;ultima riga<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8f44bbccb21c7112a3bbc67f6c4f1d8a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(0 \\ 0 \\ 0 \\ | \\ 2)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"76\" style=\"vertical-align: -5px;\"><\/p>\n<p> , cio\u00e8 tre 0 seguiti da un numero finale, \u00e8 un <strong>IF<\/strong> (Sistema Incompatibile) e quindi <strong>il sistema non ha soluzione<\/strong> .<\/p>\n<p> Sebbene non sia necessario saperlo, di seguito vedrai perch\u00e9 non ha una soluzione.<\/p>\n<p> Se prendiamo l&#8217;ultima riga, avremmo questa equazione:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-03ecf1cf353eb7dcd6a343a8306df351_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(0 \\ 0 \\ 0 \\ | \\ 2) \\ \\longrightarrow \\ 0z = 2\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"177\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Questa equazione non sar\u00e0 mai soddisfatta, perch\u00e9 qualunque valore assuma <em>z<\/em> , moltiplicandolo per 0 non dar\u00e0 mai 2 (qualsiasi numero moltiplicato per 0 d\u00e0 sempre 0). E poich\u00e9 questa equazione non sar\u00e0 mai soddisfatta, il sistema non ha soluzione.<\/p>\n<h2 class=\"wp-block-heading\"> Sistemi compatibili indeterminati dal metodo gaussiano<\/h2>\n<p class=\"has-background\" style=\"background-color:#dff6ff\"> Ogni volta che una riga della matrice gaussiana \u00e8 riempita con 0<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-982c672f4c665a863d3047ebc079aae5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{(0 \\ 0 \\ 0 \\ | \\ 0)}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"76\" style=\"vertical-align: -5px;\"><\/p>\n<p> , \u00e8 un <strong>SCI<\/strong> (Sistema Compatibile Indeterminato), e, quindi, il sistema <strong>ha infinite soluzioni<\/strong> .<\/p>\n<p> Vediamo un esempio di come risolvere un ICS:<\/p>\n<h3 class=\"wp-block-heading\"> Esempio:<\/h3>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-18a63dfebc1f23923714e475aad2e808_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x+y+2z=6 \\\\[2ex] 2x+3y-1z=-2 \\\\[2ex] 3x+4y+z=4 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"166\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Come sempre, realizziamo prima la <strong>matrice espansa del sistema<\/strong> :<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f273040101827fdfea5c9a4858be5567_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x+y+2z=6 \\\\[2ex] 2x+3y-1z=-2 \\\\[2ex] 3x+4y+z=4 \\end{array} \\right\\} \\ \\longrightarrow \\ \\left( \\begin{array}{ccc|c} 1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 2 &amp; 3 &amp; -1 &amp; -2 \\\\[2ex] 3 &amp; 4 &amp; 1 &amp; 4 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"373\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Ora vogliamo che tutti i numeri sotto la diagonale principale siano 0. Quindi, alla seconda riga aggiungiamo la prima riga moltiplicata per -2:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a5b1c48f6fb4af86886d5388f2b2a0b7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{lrrr|r}  &amp;2 &amp; 3 &amp; -1 &amp; -2  \\\\ + &amp; -2 &amp; -2 &amp; -4 &amp; -12  \\\\ \\hline &amp; 0 &amp; 1 &amp; -5 &amp; -14  \\end{array} \\begin{array}{l} \\color{blue}\\bm{\\leftarrow f_2} \\\\ \\color{blue}\\bm{\\leftarrow -2f_1} \\\\ \\phantom{hline} \\\\ \\end{array}\" title=\"Rendered by QuickLaTeX.com\" height=\"68\" width=\"295\" style=\"vertical-align: -29px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c889a6f147c6b0430731aa778121af52_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}  1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 2 &amp; 3 &amp; -1 &amp; -2 \\\\[2ex] 3 &amp; 4 &amp; 1 &amp; 4\\end{array} \\right) \\begin{array}{c}   \\\\[2ex]  \\xrightarrow{f_2 -2f_1}  \\\\[2ex] &amp; \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\\\[2ex] 3 &amp; 4 &amp; 1 &amp; 4 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"394\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Per convertire 3 in 0, nella terza riga aggiungiamo la prima riga moltiplicata per -3:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-53df3b7a8935a9c979dc450463a25b1f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{lrrr|r}  &amp; 3 &amp; 4 &amp; 1 &amp; 4 \\\\ + &amp; -3 &amp; -3 &amp; -6 &amp; -18  \\\\  \\hline &amp; 0 &amp; 1 &amp; -5 &amp; -14  \\end{array} \\begin{array}{l} \\color{blue}\\bm{\\leftarrow f_3} \\\\ \\color{blue}\\bm{\\leftarrow -3f_1} \\\\ \\phantom{hline} \\\\ \\end{array}\" title=\"Rendered by QuickLaTeX.com\" height=\"68\" width=\"295\" style=\"vertical-align: -29px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c5acccc51108267fef6d3320068743aa_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}  1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\\\[2ex] 3 &amp; 4 &amp; 1 &amp; 4 \\end{array} \\right) \\begin{array}{c}   \\\\[2ex]    \\\\[2ex] \\xrightarrow{f_3 -3f_1} &amp; \\end{array} \\left( \\begin{array}{ccc|c}  1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"403\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Per convertire l&#8217;1 nell&#8217;ultima riga in 0, nella terza riga aggiungiamo la seconda riga moltiplicata per -1:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a386320e49668f86c83fa99665df4851_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{lrrr|r}  &amp; 0 &amp; 1 &amp; -5 &amp; -14   \\\\ + &amp; 0 &amp; -1 &amp; 5 &amp; 14  \\\\ \\hline &amp; 0 &amp; 0 &amp; 0 &amp; 0  \\end{array} \\begin{array}{l} \\color{blue}\\bm{\\leftarrow f_3} \\\\ \\color{blue}\\bm{\\leftarrow -1f_2} \\\\ \\phantom{hline} \\\\ \\end{array}\" title=\"Rendered by QuickLaTeX.com\" height=\"68\" width=\"282\" style=\"vertical-align: -29px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a02e4819adfbe7b80d2952f87f113757_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}   1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\end{array} \\right) \\begin{array}{c}   \\\\[2ex]    \\\\[2ex] \\xrightarrow{f_3 -1f_2} &amp; \\end{array} \\left( \\begin{array}{ccc|c}   1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 0 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"403\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Poich\u00e9 <strong>l&#8217;ultima riga \u00e8 tutta 0<\/strong> , possiamo rimuoverla:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6aea469dceab08e6aa62571922eb2824_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 0  \\end{array} \\right) \\ \\longrightarrow \\ \\left( \\begin{array}{ccc|c}   1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"376\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> E poich\u00e9 abbiamo un&#8217;intera riga piena di 0, questo \u00e8 uno <strong>SCI.<\/strong><\/p>\n<p> Ci ritroviamo quindi con il seguente sistema:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-598c031f4cba5a865952a57ed46f0f95_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}   1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; -5 &amp; -14  \\end{array} \\right) \\ \\longrightarrow \\ \\left. \\begin{array}{r} x+y+2z=6 \\\\[2ex] y-5z=-14 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"65\" width=\"357\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-background\" style=\"background-color:#dff6ff\"> Quando il sistema \u00e8 uno SCI \u00e8 necessario prendere il valore del parametro da un&#8217;incognita<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> . E <strong>dobbiamo risolvere il sistema in base a questo parametro<\/strong><\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ff991fffb1b86160766a7edd85fcb4f2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> .<\/p>\n<div class=\"adsb30\" style=\" margin:px; text-align:\"><\/div>\n<p> Pertanto assegniamo il valore di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> alla <em>z<\/em> :<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-67f77b7061fcc45e08104094a17ece7f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"z = \\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"43\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Anche se avremmo potuto scegliere anche qualsiasi altra incognita di cui apprezzare il valore<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> .<\/p>\n<p> Ora isoliamo <em>y<\/em> dalla seconda equazione e lasciamo che sia una funzione di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> : <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-adaf77dbbf7d0556e9d53db96af6bef9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y-5z=-14 \\ \\xrightarrow{z \\ = \\ \\lambda} \\  y-5(\\lambda )= -14\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"294\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0d7706e1d35463a9926dbc303cb4ab43_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y-5\\lambda=-14\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"106\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-32e5a1e5b147d0473cc608b87aa89494_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y =-14+  5\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"105\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> E infine eliminiamo <em>x<\/em> dalla prima equazione e la lasciamo anche in funzione di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> : <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-71ea139c729093d688e98a581fd329dc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x+y+2z=6 \\ \\xrightarrow{ y \\ = \\ -14 + 5\\lambda \\ ; \\ z \\ = \\  \\lambda } \\ x+ (-14+ 5\\lambda )+2(\\lambda ) = 6\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"484\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-aa2f4abf72f8d384d6767f8c05e565eb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x-14 +5\\lambda +2\\lambda = 6\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"164\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-25822a08cad8c0b1899177dbcdf85545_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=14- 5\\lambda -2\\lambda + 6\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"164\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-7314023de779f37d222132402c95b418_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=20- 7\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"92\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Le soluzioni del sistema sono quindi:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c67a3cb191f6fadc69e98891cd55b932_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{z = \\lambda} \\qquad \\bm{y =-14+ 5\\lambda } \\qquad \\bm{x=20 - 7\\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"311\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Come puoi vedere, quando il sistema \u00e8 SCI lasciamo le soluzioni a seconda del parametro<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> . E ricorda che ha infinite soluzioni, perch\u00e9 a seconda del valore che assume<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> , la soluzione sar\u00e0 l&#8217;una o l&#8217;altra.<\/p>\n<p> Prima di passare agli esercizi risolti, devi sapere che sebbene in questo articolo utilizziamo il metodo di Gauss, un altro modo per discutere e risolvere sistemi di equazioni lineari \u00e8 <a href=\"https:\/\/mathority.org\/it\/teorema-di-de-rouche-frobenius-con-esempi-ed-esercizi-risolti\/\">il teorema di Rouche<\/a> . In effetti, probabilmente \u00e8 pi\u00f9 usato.<\/p>\n<h2 class=\"wp-block-heading\"> Esercizi risolti per la discussione di sistemi di equazioni utilizzando il metodo Gauss-Jordan <\/h2>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-118\"><\/div>\n<\/div>\n<h3 class=\"wp-block-heading\"> Esercizio 1<\/h3>\n<p> Determina quale tipo di sistema \u00e8 coinvolto e risolvi il seguente sistema di equazioni utilizzando il metodo di Gauss: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-be4ba1bd1ce7452e66c5189d995d948c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x+y+2z=6 \\\\[2ex] 2x+3y+5z=8 \\\\[2ex] 3x+3y+6z=9  \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"152\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E3F2FD boto_ver_solucion\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E3F2FD\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>vedi soluzione<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> La prima cosa che dobbiamo fare \u00e8 la matrice estesa del sistema:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b600f3fc0d79a06eb972dbacb673a780_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x+y+2z=6 \\\\[2ex] 2x+3y+5z=8 \\\\[2ex] 3x+3y+6z=9 \\end{array} \\right\\}  \\longrightarrow \\left( \\begin{array}{ccc|c} 1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex]  2 &amp; 3 &amp; 5 &amp; 8 \\\\[2ex] 3 &amp; 3 &amp; 6 &amp; 9 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"320\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora dobbiamo rendere 0 tutti i numeri sotto l&#8217;array principale.<\/p>\n<p class=\"has-text-align-left\"> Eseguiamo quindi operazioni sulle righe per cancellare gli ultimi due termini della prima colonna:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a1d832d5bb115666614ae96822c360eb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex]  2 &amp; 3 &amp; 5 &amp; 8 \\\\[2ex]3 &amp; 3 &amp; 6 &amp; 9 \\end{array} \\right) \\begin{array}{c} \\\\[2ex] \\xrightarrow{f_2 - 2f_1} \\\\[2ex] \\xrightarrow{f_3 - 3f_1}&amp; \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; 1 &amp; 2 &amp; 6 \\\\[2ex] 0 &amp; 1 &amp; 1 &amp; -4 \\\\[2ex] 0 &amp; 0 &amp; 0 &amp; -9 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"344\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Abbiamo ottenuto una riga della matrice composta da tre 0 seguiti da un numero. Si tratta quindi di un <strong>IS<\/strong> (Sistema Incompatibile) e il sistema <strong>non ha soluzione.<\/strong><\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\"> Esercizio 2<\/h3>\n<p> Determina di che tipo di sistema si tratta e trova la soluzione del seguente sistema di equazioni utilizzando il metodo di Gauss: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-7f5aba495f2c6a301e923ee3c6238012_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x-2y+3z=1 \\\\[2ex] -2x+5y-z=5 \\\\[2ex] -x+3y+2z=6 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"156\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E3F2FD boto_ver_solucion\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E3F2FD\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>vedi soluzione<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> La prima cosa che dobbiamo fare \u00e8 la matrice estesa del sistema:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f8bb5e5ab85946bddad72067fe17d937_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x-2y+3z=1 \\\\[2ex] -2x+5y-z=5 \\\\[2ex] -x+3y+2z=6  \\end{array} \\right\\}  \\longrightarrow \\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex]  -2 &amp; 5 &amp; -1 &amp; 5 \\\\[2ex] -1 &amp; 3 &amp; 2 &amp; 6 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"365\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora dobbiamo rendere 0 tutti i numeri sotto l&#8217;array principale.<\/p>\n<p class=\"has-text-align-left\"> Eseguiamo quindi operazioni sulle righe per cancellare gli ultimi due termini della prima colonna:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-83e48becaaa6683719ac57eb7d118943_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex]  -2 &amp; 5 &amp; -1 &amp; 5 \\\\[2ex] -1 &amp; 3 &amp; 2 &amp; 6 \\end{array} \\right) \\begin{array}{c} \\\\[2ex] \\xrightarrow{f_2 + 2f_1} \\\\[2ex] \\xrightarrow{f_3 + f_1}  \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"385\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora proviamo a rimuovere l&#8217;ultimo elemento dalla seconda colonna:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-16a1afc0eb224ee5f05c9e313586854d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7  \\end{array} \\right) \\begin{array}{c} \\\\[2ex]  \\\\[2ex] \\xrightarrow{f_3 -f_2} \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7 \\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 0 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"351\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ma otteniamo un&#8217;intera riga di 0. Quindi questo \u00e8 uno <strong>SCI<\/strong> e il sistema ha <strong>infinite soluzioni.<\/strong><\/p>\n<p class=\"has-text-align-left\"> Ma poich\u00e9 si tratta di un ICS, possiamo risolvere il sistema in base a<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> . Eliminiamo quindi la riga 0:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c838c5f1b229d4c8a43ac9ddd8e3629_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7 \\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 0 \\end{array} \\right) \\ \\longrightarrow \\ \\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"331\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Esprimiamo ora la matrice sotto forma di un sistema di equazioni in incognite:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b3fd941d33fec646d16b8181430c9986_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; -2 &amp; 3 &amp; 1 \\\\[2ex] 0 &amp; 1 &amp; 5 &amp; 7  \\end{array} \\right) \\ \\longrightarrow \\ \\left. \\begin{array}{r} 1x-2y+3z=1 \\\\[2ex] 1y+5z=7 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"65\" width=\"352\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Diamo il valore di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> Per<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bc71729520f0274771a717ce2c320783_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"z :\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"18\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-abcd65ca2a131b846dcf56a5af3e8288_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{z = \\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"43\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Sostituiamo il valore di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4586e340cb83d5b642972e97a288fec2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"z\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> nella seconda equazione per trovare il valore di <\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a70e6a4387a816f153e8597195143f54_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y :\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"18\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ef9d3e908b97a8fa0fc67ffbc41e1b9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1y+5z=7 \\ \\xrightarrow{z \\ = \\ \\lambda} \\ 1y+5(\\lambda )=7\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"265\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c7b130da4f2704ffbf775f40ee7a3d5d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y+5\\lambda =7\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"83\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-88c6088a22d57673e995b351f06c1e0d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{y=7-5\\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"82\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E facciamo lo stesso con la prima equazione: sostituiamo i valori delle altre incognite e cancelliamo <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0a2431573b3a6b42537cbb0647aae6db_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x :\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"19\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a42277e0281993d410553779736ed6ee_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1x-2y+3z=1 \\ \\xrightarrow{y \\ = \\ 7-5\\lambda \\ ; \\ z \\ = \\ \\lambda} \\ 1x-2(7-5\\lambda )+3(\\lambda )=1\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"477\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8160e68cd793ee02ea9bdf693739d9de_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x-14+10\\lambda+3\\lambda=1\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"172\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2d0cc29914223f805421366e5a6163e8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=1+14-10\\lambda-3\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"172\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ba56c9f5b4e3df85c8487bbf22c468f8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x=15-13\\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"101\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> La soluzione del sistema di equazioni \u00e8 quindi: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-1457d59269c1eecd481f141507f7ca94_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x=15-13\\lambda} \\qquad \\bm{y=7-5\\lambda} \\qquad \\bm{z = \\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"298\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-119\"><\/div>\n<\/div>\n<h3 class=\"wp-block-heading\"> Esercizio 3<\/h3>\n<p> Trova di che tipo di sistema si tratta e risolvi il seguente sistema di equazioni con il metodo di Gauss: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b04370b42854e53c650ca0eae14aadb5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} 4x-4y+z=-4 \\\\[2ex] x+3y+z=2 \\\\[2ex] x+5y+2z=6 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"157\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E3F2FD boto_ver_solucion\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E3F2FD\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>vedi soluzione<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> La prima cosa che dobbiamo fare \u00e8 la matrice estesa del sistema:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ff2c7644e19fdf405f3c5c42ffc0ee98_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} 4x-4y+z=-4 \\\\[2ex] x+3y+z=2 \\\\[2ex] x+5y+2z=6\\end{array} \\right\\}  \\longrightarrow \\left( \\begin{array}{ccc|c} 4 &amp; -4 &amp; 1 &amp; -4 \\\\[2ex]  1 &amp; 3 &amp; 1 &amp; 2 \\\\[2ex] 1 &amp; 5 &amp; 2 &amp; 6 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"352\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Per applicare il metodo di Gauss, \u00e8 pi\u00f9 semplice se il primo numero nella prima riga \u00e8 1. Cambieremo quindi l&#8217;ordine delle righe 1 e 2:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-471d89605d4bf6ddef1896a8fbe4c5ea_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 4 &amp; -4 &amp; 1 &amp; -4 \\\\[2ex]  1 &amp; 3 &amp; 1 &amp; 2 \\\\[2ex] 1 &amp; 5 &amp; 2 &amp; 6 \\end{array} \\right) \\begin{array}{c} \\xrightarrow{f_1 \\rightarrow f_2} \\\\[2ex] \\xrightarrow{f_2 \\rightarrow f_1} \\\\[2ex] &amp; \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; 3 &amp; 1 &amp; 2  \\\\[2ex] 4 &amp; -4 &amp; 1 &amp; -4 \\\\[2ex] 1 &amp; 5 &amp; 2 &amp; 6  \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"101\" width=\"381\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora dobbiamo rendere 0 tutti i numeri sotto l&#8217;array principale.<\/p>\n<p class=\"has-text-align-left\"> Eseguiamo quindi operazioni sulle righe per cancellare gli ultimi due termini della prima colonna:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f4d5cbc50b87927077018175c4678e90_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}  1 &amp; 3 &amp; 1 &amp; 2  \\\\[2ex] 4 &amp; -4 &amp; 1 &amp; -4 \\\\[2ex] 1 &amp; 5 &amp; 2 &amp; 6 \\end{array} \\right) \\begin{array}{c} \\\\[2ex] \\xrightarrow{f_2 - 4f_1} \\\\[2ex] \\xrightarrow{f_3 -f_1} \\end{array} \\left( \\begin{array}{ccc|c}  1 &amp; 3 &amp; 1 &amp; 2  \\\\[2ex] 0 &amp; -16 &amp; -3 &amp; -12 \\\\[2ex] 0 &amp; 2 &amp; 1 &amp; 4 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"417\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora convertiamo l&#8217;ultimo elemento della seconda colonna in zero:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9013720883fd719e2bd0779bfbaa7a9f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}1 &amp; 3 &amp; 1 &amp; 2  \\\\[2ex] 0 &amp; -16 &amp; -3 &amp; -12 \\\\[2ex] 0 &amp; 2 &amp; 1 &amp; 4   \\end{array} \\right) \\begin{array}{c} \\\\[2ex]  \\\\[2ex] \\xrightarrow{8f_3 + f_2} \\end{array} \\left( \\begin{array}{ccc|c}1 &amp; 3 &amp; 1 &amp; 2  \\\\[2ex] 0 &amp; -16 &amp; -3 &amp; -12 \\\\[2ex] 0 &amp; 0 &amp; 5 &amp; 20 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"448\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Questo sistema \u00e8 <strong>SCD<\/strong> , poich\u00e9 siamo riusciti a spostare la matrice e l&#8217;ultima riga \u00e8 del tipo<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5d701f6e0afb7579229228d226ee2186_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(0 \\ 0 \\ n \\ | \\ m)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"85\" style=\"vertical-align: -5px;\"><\/p>\n<p> . Pertanto, avr\u00e0 <strong>una soluzione unica.<\/strong><\/p>\n<p class=\"has-text-align-left\"> Una volta che tutti i numeri sotto la diagonale principale sono 0, possiamo risolvere il sistema di equazioni. Per fare ci\u00f2, esprimiamo nuovamente la matrice sotto forma di un sistema di equazioni in incognite:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0f0433738d5d0a22bdd3b04dbd44fd1e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; 3 &amp; 1 &amp; 2  \\\\[2ex] 0 &amp; -16 &amp; -3 &amp; -12 \\\\[2ex] 0 &amp; 0 &amp; 5 &amp; 20 \\end{array} \\right) \\ \\longrightarrow \\ \\left. \\begin{array}{r} x+3y+1z=2 \\\\[2ex] -16y-3z=-12 \\\\[2ex] 5z=20 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"402\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E risolviamo le incognite delle equazioni dal basso verso l&#8217;alto. Risolviamo prima l&#8217;ultima equazione: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a71cace2e71d01970e94195b1c2ffe8b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"5z=20\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"60\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f4bbdadf2ee34baa77ffe1e658850927_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{z}=\\cfrac{20}{5} = \\bm{4}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"85\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora sostituiamo il valore di z nella seconda equazione per trovare il valore di y: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-77c84cccb610ceeb681601f6a4805fd5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-16y-3z=-12 \\ \\xrightarrow{z \\ = \\ 4} \\ -16y-3(4)=-12\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"352\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-72b89c805a36e7f423b722a176cdf7d8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-16y-12=-12\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"134\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-41071516425cd346030975b58a32ebd4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-16y=-12+12\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"134\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b8d50f9873947a16018789af09740e00_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-16y=0\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"72\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-30a6ccf8b222af4383b58c7f5fc166b2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{y}=\\cfrac{0}{-16}= \\bm{0}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"99\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E facciamo lo stesso con la prima equazione: sostituiamo i valori delle altre incognite e risolviamo per x: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6f5523088917941892ceaefd1f6ce733_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x+3y+1z=2  \\ \\xrightarrow{y \\ = \\ 0 \\ ; \\ z \\ = \\ 4} \\ x+3(0)+1(4)=2\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"391\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-88d555fb46e6615b9885d98abc17a0ef_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x+0+4=2\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"103\" style=\"vertical-align: -2px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2a1137f222574a52be67af062fadde9f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=2-4\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"73\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6505a1b32f86c9deb3ab0716f13c3949_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x=-2}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"56\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> La soluzione del sistema di equazioni \u00e8 quindi: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6ac2b4e4cbdb1d0f8b4f92bfd5d6bb33_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x=-2} \\qquad \\bm{y=0} \\qquad \\bm{z=4}\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"211\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\">Esercizio 4<\/h3>\n<p> Determina di che tipo di sistema si tratta e risolvi il seguente sistema di equazioni con il metodo di Gauss: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4e8a133547b4719d7833a792550fd322_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x-y+4z=2 \\\\[2ex] -3x-3y+3z=7 \\\\[2ex] -2x-4y+7z=9 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"165\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E3F2FD boto_ver_solucion\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E3F2FD\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>vedi soluzione<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> La prima cosa che dobbiamo fare \u00e8 la matrice estesa del sistema:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cc41f78456a922a0fbff419d336b0b46_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left. \\begin{array}{r} x-y+4z=2 \\\\[2ex] -3x-3y+3z=7 \\\\[2ex] -2x-4y+7z=9  \\end{array} \\right\\}  \\longrightarrow \\left( \\begin{array}{ccc|c}1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex]  -3 &amp; -3 &amp; 3 &amp; 7 \\\\[2ex] -2 &amp; -4 &amp; 7 &amp; 9\\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"360\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora dobbiamo rendere 0 tutti i numeri sotto l&#8217;array principale.<\/p>\n<p class=\"has-text-align-left\"> Eseguiamo quindi operazioni sulle righe per cancellare gli ultimi due termini della prima colonna:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ff92912f653c6aca7ceb7c990c9635a3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex]  -3 &amp; -3 &amp; 3 &amp; 7 \\\\[2ex] -2 &amp; -4 &amp; 7 &amp; 9\\end{array} \\right) \\begin{array}{c} \\\\[2ex] \\xrightarrow{f_2 + 3f_1} \\\\[2ex] \\xrightarrow{f_3 + 2f_1} \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13\\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13\\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"389\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ora proviamo a rimuovere l&#8217;ultimo elemento dalla seconda colonna:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-3c6904a64a721f3a92bef8c6b7d713cf_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c}1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13\\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13\\end{array} \\right) \\begin{array}{c} \\\\[2ex]  \\\\[2ex] \\xrightarrow{f_3 -1f_2} \\end{array} \\left( \\begin{array}{ccc|c} 1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13\\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 0 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"98\" width=\"393\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ma otteniamo un&#8217;intera riga di 0. Quindi questo \u00e8 uno <strong>SCI<\/strong> e il sistema ha <strong>infinite soluzioni.<\/strong><\/p>\n<p class=\"has-text-align-left\"> Ma poich\u00e9 si tratta di un ICS, possiamo risolvere il sistema in base a<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> . Eliminiamo quindi la riga 0:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6d856e2c1246f3629d68a7bcd3cd759a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13\\\\[2ex] 0 &amp; 0 &amp; 0 &amp; 0 \\end{array} \\right) \\ \\longrightarrow \\ \\left( \\begin{array}{ccc|c} 1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13 \\end{array} \\right)\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"366\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Esprimiamo ora la matrice sotto forma di un sistema di equazioni in incognite:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a4cf1265bfc12f94580de183230c8b7c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left( \\begin{array}{ccc|c} 1 &amp; -1 &amp; 4 &amp; 2 \\\\[2ex] 0 &amp; -6 &amp; 15 &amp; 13 \\end{array} \\right) \\ \\longrightarrow \\ \\left. \\begin{array}{r} 1x-1y+4z=2 \\\\[2ex] -6y+15z=13 \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"65\" width=\"370\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Diamo il valore di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2b5c45836864531b8e37025dabadd24a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> Per<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bc71729520f0274771a717ce2c320783_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"z :\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"18\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-abcd65ca2a131b846dcf56a5af3e8288_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{z = \\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"43\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Sostituiamo il valore di<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4586e340cb83d5b642972e97a288fec2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"z\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> nella seconda equazione per trovare il valore di <\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a70e6a4387a816f153e8597195143f54_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y :\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"18\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-505fd2d7f1d3de194527308d053c4588_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-6y+15z=13 \\ \\xrightarrow{z \\ = \\ \\lambda} \\ -6y+15(\\lambda )=13\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"328\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-28edac5e241772779578f73cf500c7ac_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-6y+15\\lambda =13\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"122\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4bd3cf3776b4e1ef1495979ad265bbd3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-6y =13-15\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"122\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-077278683cc8adf383b53504ee01f6af_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{y =} \\mathbf{\\cfrac{13-15\\lambda }{-6}}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"103\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E facciamo lo stesso con la prima equazione: sostituiamo i valori delle altre incognite e cancelliamo <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0a2431573b3a6b42537cbb0647aae6db_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x :\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"19\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5e5a39e7562e2bf3d3b969f5db5294f6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1x-1y+4z=2 \\ \\xrightarrow{y \\ = \\ \\frac{13-15\\lambda }{-6} \\ ; \\ z \\ = \\ \\lambda} \\ 1x-1\\left(\\cfrac{13-15\\lambda }{-6} \\right)+4(\\lambda)=2\" title=\"Rendered by QuickLaTeX.com\" height=\"54\" width=\"526\" style=\"vertical-align: -23px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0dde1c51e85f2547d89aa435671f9f80_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x-\\cfrac{13-15\\lambda }{-6} +4\\lambda=2\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"174\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-3493f037522f90054e681e659ebe4a43_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=2+\\cfrac{13-15\\lambda }{-6} -4\\lambda\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"174\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Abbiamo una somma con frazioni. Pertanto, riduciamo tutti i termini a un denominatore comune: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-47d211adb8dac8be1f446457d37313f6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=\\cfrac{-6 \\cdot 2}{-6}+\\cfrac{13-15\\lambda }{-6} -\\cfrac{-6 \\cdot 4 \\lambda}{-6}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"266\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9a5bf6ea2922cec38e35f9448285dfa9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=\\cfrac{-12}{-6}+\\cfrac{13-15\\lambda }{-6} -\\cfrac{-24 \\lambda}{-6}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"240\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Dato che ora hanno tutti lo stesso denominatore, possiamo raggrupparli in un&#8217;unica frazione:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-21d28bc7a89872df5d1bfbcb2889898c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=\\cfrac{-12+13-15\\lambda-(-24 \\lambda) }{-6}\" title=\"Rendered by QuickLaTeX.com\" height=\"40\" width=\"242\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ed infine operiamo sul numeratore: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9d1cba1b643fbb1bfed40441b1c51c34_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=\\cfrac{-12+13-15\\lambda+24 \\lambda }{-6}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"215\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e99f60f5d3036dcf3151e112a16bbfdc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x=}\\mathbf{\\cfrac{1+9\\lambda }{-6} }\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"84\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> La soluzione del sistema di equazioni \u00e8 quindi:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2c43d0a3db9ba3aabcd68aafb4c781cd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{x=15-13\\lambda} \\qquad \\bm{y =} \\mathbf{\\cfrac{13-15\\lambda }{-6}} \\qquad \\bm{z = \\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"318\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In questa sezione vedremo come discutere e risolvere un sistema di equazioni con il metodo di Gauss-Jordan . Cio\u00e8, determinare se si tratta di un sistema compatibile determinato (DCS), un sistema compatibile indeterminato (ICS) o un sistema incompatibile. Inoltre, troverai esempi ed esercizi risolti per poter praticare e assimilare perfettamente i concetti. Per capire cosa &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/\"> <span class=\"screen-reader-text\">Discussione di sistemi di equazioni utilizzando il metodo gaussiano<\/span> Leggi altro &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-301","post","type-post","status-publish","format-standard","hentry","category-spiegazioni-matematiche"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Discussione dei sistemi di equazioni utilizzando il metodo gaussiano -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Discussione dei sistemi di equazioni utilizzando il metodo gaussiano -\" \/>\n<meta property=\"og:description\" content=\"In questa sezione vedremo come discutere e risolvere un sistema di equazioni con il metodo di Gauss-Jordan . Cio\u00e8, determinare se si tratta di un sistema compatibile determinato (DCS), un sistema compatibile indeterminato (ICS) o un sistema incompatibile. Inoltre, troverai esempi ed esercizi risolti per poter praticare e assimilare perfettamente i concetti. 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dei sistemi di equazioni utilizzando il metodo gaussiano -","og_description":"In questa sezione vedremo come discutere e risolvere un sistema di equazioni con il metodo di Gauss-Jordan . Cio\u00e8, determinare se si tratta di un sistema compatibile determinato (DCS), un sistema compatibile indeterminato (ICS) o un sistema incompatibile. Inoltre, troverai esempi ed esercizi risolti per poter praticare e assimilare perfettamente i concetti. Per capire cosa &hellip; Discussione di sistemi di equazioni utilizzando il metodo gaussiano Leggi altro &raquo;","og_url":"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/","article_published_time":"2023-07-06T16:09:27+00:00","og_image":[{"url":"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e51d504887586898a4b88863a128c8e2_l3.png"}],"author":"Squadra di Mathority","twitter_card":"summary_large_image","twitter_misc":{"Scritto da":"Squadra di Mathority","Tempo di lettura stimato":"6 minuti"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/#article","isPartOf":{"@id":"https:\/\/mathority.org\/it\/discussione-di-sistemi-di-equazioni-utilizzando-il-metodo-di-gauss-con-esercizi-risolti\/"},"author":{"name":"Squadra di 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