Question

URGENTE!!!!
pra hoje, por favor, quem responder só pelos pontos vai ser denunciado

Answer 1

$\left[\begin{array}{ccc}-1&2&3\\-1&2&1\end{array}\right]-\left[\begin{array}{ccc}2&-2&-1\\-1&2&2\end{array}\right]= \\\\\\ \left[\begin{array}{ccc}-1&2&3\\-1&2&1\end{array}\right]+\left[\begin{array}{ccc}-2&2&1\\1&-2&-2\end{array}\right]= \\\\\\ \left[\begin{array}{ccc}-3&4&4\\0&0&-1\end{array}\right]$