Să se determine inversa matricei [tex]A=\left([tex]\begin{array}{rrr}1 & -3 & -1 \\ -1 & 4 & 1 \\ 1 & 9 & -2\end{array}\right)[/tex] luând [tex]A^{-1}=\left(\begin{array}{ccc}x & y & z \\ m & n & p \\ u & v & z\end{array}\right)[/tex].[/tex]