Question

Alguém poderia me ajudar nessas questões?​

Answer 1

Resposta:

1)Basta somarmos os elementos correspondentes:

$C=\left[\begin{array}{cc}3&4\\5&1\end{array}\right] + D= \left[\begin{array}{cc}0&2\\3&4\end{array}\right] \\\\C+D= \left[\begin{array}{cc}3&6\\8&5\end{array}\right]$

2) Para calcularmos determinantes basta multiplicarmos a digonal principal e a diagonal secundaria, e subtrairmos.

$\left[\begin{array}{ccc}6&4\\8&6\end{array}\right] \\\\6*6 - 8*4\\36-32=4\\DetB= 4$

3)

$A=\left[\begin{array}{ccc}5&7\\2&4\end{array}\right] B=\left[\begin{array}{ccc}3&6\\2&1\end{array}\right]\\\\\\A) A+B= \left[\begin{array}{ccc}8&13\\4&5\end{array}\right] \\\\\\B)A-B=\left[\begin{array}{ccc}2&1\\0&3\end{array}\right] \\\\\\C) A*B =\left[\begin{array}{ccc}15&42\\4&4\end{array}\right]$