Question

Me ajudem! Por favor. :)

Answer 1

6.

$\mathrm{Sejam\ duas\ matrizes\ 2\times2}\ A\ \text{e}\ B\ \text{tais que:}$

$A=\left[\begin{array}{cc}1&2\\-3&4\end{array}\right]\ \text{e}\ B=\left[\begin{array}{cc}0&-2\\3&1\end{array}\right].$

$\mathrm{A\ matriz}\ C=A+B\ \mathrm{ser\acute{a}\ dada}\ \text{por:}$

$C=\left[\begin{array}{cc}1&2\\-3&4\end{array}\right]+\left[\begin{array}{cc}0&-2\\3&1\end{array}\right] \ \therefore\ \boxed{C=\left[\begin{array}{cc}1&0\\0&5\end{array}\right] }$

$\mathrm{Letra\ C}\Longrightarrow \mathrm{F-F-V-F.}$

7.

$\mathrm{Seja\ a\ matriz}\ A=\left(a_{ij}\right)_{3\times3}\ \mathrm{tal\ que}\ a_{ij}=i^2+j^2.$

$\mathrm{O\ termo}\ a_{23}\ \mathrm{ser\acute{a}\ dado}\ \text{por:}$

$a_{23}=2^2+3^2=4+9\ \therefore\ \boxed{a_{23}=13}$

$\mathrm{Letra\ B}\Longrightarrow 13.$