Question

❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗!!!!!!​

Answer 1

Resposta:

❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗❗

Explicação passo-a-passo:

$2A = \left[\begin{array}{ccc}(-1).2&0.2\\2.2&1.2\end{array}\right] = \left[\begin{array}{ccc}-2&0\\4&2\end{array}\right]$

$\frac{1}{2}. B= \frac{B}{2} = \left[\begin{array}{ccc}\frac{4}{2}&\frac{2}{2}\\\frac{1}{2}&\frac{0}{2}\end{array}\right] = \left[\begin{array}{ccc}2&1\\\frac{1}{2}&0\end{array}\right]$

Então, $2A - \frac{1}{2}.B =$ $\left[\begin{array}{ccc}-2&0\\4&2\end{array}\right] - \left[\begin{array}{ccc}2&1\\\frac{1}{2}&0\end{array}\right] = \left[\begin{array}{ccc}-4&-1\\\frac{7}{2}&2\end{array}\right]$

Alternativa A.