Ответ:
[tex]\left\{\begin{array}{l}2x-3y+z=2\\3x+2y+3z=1\\-x+2y-2z=6\end{array}\right\ \ \Rightarrow \ \ \ \ \left(\begin{array}{cccl}-1&2&-2&|\ 6\\2&-3&1&|\ 2\\3&2&3&|\ 1\end{array}\right)\sim[/tex]
1 строку * 2 +2 стр. ; 1 стр. * 3 +3 стр.
[tex]\sim \left(\begin{array}{cccl}-1&2&-2&|\ 6\\0&1&-3&|\ 14\\0&8&-3&|\ 19\end{array}\right)\sim \ \ \ 2str\cdot (-8)+3str\ \ \ \left(\begin{array}{cccl}-1&2&-2&|\ 6\\0&1&-3&|\ 14\\0&0&21&|-93\end{array}\right)[/tex]
[tex]\left\{\begin{array}{lll}-x+2y-2z=6\\\qquad \ \ y-3z=14\\\ \ \ \qquad 21z=-93\end{array}\right\ \ \ \left\{\begin{array}{lll}x=2y-2z-6\\y=14+3z\\z=-\dfrac{31}{7}\end{array}\right\ \ \left\{\begin{array}{lll}x=\dfrac{10}{7}+\dfrac{62}{7}-6=\dfrac{30}{7}\\y=14-\dfrac{93}{7}=\dfrac{5}{7}\\z=-\dfrac{31}{7}\end{array}\right[/tex]
[tex]Otvet:\ \ \left\{\begin{array}{lll}x=\dfrac{30}{7}\\y=\dfrac{5}{7}\\z=-\dfrac{31}{7}\end{array}\right[/tex]
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Ответ:
[tex]\left\{\begin{array}{l}2x-3y+z=2\\3x+2y+3z=1\\-x+2y-2z=6\end{array}\right\ \ \Rightarrow \ \ \ \ \left(\begin{array}{cccl}-1&2&-2&|\ 6\\2&-3&1&|\ 2\\3&2&3&|\ 1\end{array}\right)\sim[/tex]
1 строку * 2 +2 стр. ; 1 стр. * 3 +3 стр.
[tex]\sim \left(\begin{array}{cccl}-1&2&-2&|\ 6\\0&1&-3&|\ 14\\0&8&-3&|\ 19\end{array}\right)\sim \ \ \ 2str\cdot (-8)+3str\ \ \ \left(\begin{array}{cccl}-1&2&-2&|\ 6\\0&1&-3&|\ 14\\0&0&21&|-93\end{array}\right)[/tex]
[tex]\left\{\begin{array}{lll}-x+2y-2z=6\\\qquad \ \ y-3z=14\\\ \ \ \qquad 21z=-93\end{array}\right\ \ \ \left\{\begin{array}{lll}x=2y-2z-6\\y=14+3z\\z=-\dfrac{31}{7}\end{array}\right\ \ \left\{\begin{array}{lll}x=\dfrac{10}{7}+\dfrac{62}{7}-6=\dfrac{30}{7}\\y=14-\dfrac{93}{7}=\dfrac{5}{7}\\z=-\dfrac{31}{7}\end{array}\right[/tex]
[tex]Otvet:\ \ \left\{\begin{array}{lll}x=\dfrac{30}{7}\\y=\dfrac{5}{7}\\z=-\dfrac{31}{7}\end{array}\right[/tex]