Question

me ajudem por favor ​

Answer 1

Resposta:

$A = \begin{pmatrix} 1 & 2 \\ 1 & 3 \\ \end{pmatrix}$

Matriz inversa:

forma geral:

$\left(\begin{matrix}a & b \\c & d\end{matrix}\right) = \left(\begin{matrix}d & -b \\-c & a\end{matrix}\right)$

Matriz inversa:

$\left(\begin{matrix}1 & 2 \\1 & 3\end{matrix}\right) = \left(\begin{matrix}3 & -2 \\-1 & 1\end{matrix}\right)$