Question

Qual é a resposta dessas três questões?

Answer 1

Resposta:

Explicação passo-a-passo:

1)

$\left[\begin{array}{ccc}8&15\\7&13\end{array}\right]$ = 8 . 13 - (7 . 15) = 104 - 105 = - 1

2)

$\left[\begin{array}{ccc}1&3&0\\2&5&1\\2&1&3\\1&3&0\\2&5&1\end{array}\right]$ = 21 - 19 = 2

Elemento `a direita:

1 . 5 . 3 + 2 . 1 . 0 + 2 . 3 . 1 = 15 + 0 + 6 = 21

Elemento `a esquerda:

-(0 . 5 . 2) -  (1. 1. 1) - (3. 3. 2) = 0 - 1 - 18 = - 19

3)

$\left[\begin{array}{ccc}2&1\\5&3\end{array}\right] X \left[\begin{array}{ccc}3&-1\\-5&2\end{array}\right] = \left[\begin{array}{ccc}2 . 3 + 1 . (-5)&2 . (-1) + 1 . 2\\5 . 3 + 3. (-5)&5.(-1) + 3 . 2\end{array}\right] =\left[\begin{array}{ccc}1&0\\0&1\end{array}\right]$

$D =\left[\begin{array}{ccc}1&0\\0&1\end{array}\right] = 1 - 0 = 1$