Question

construa as seguintes matrizes.  ME AJUDEM ?!
A = (aij)3x3 tal que aij = { 1,se i = j }
{ 0,se i ≠ j }

B = (bij)3x3 tal que bij = { i + 2j, se i ≠ j }
{ i - 3j, se i = j }

Answer 1

Oi. Segue respostas: 
$A=\left[\begin{array}{ccc}a11&a12&a13\\a21&a22&a23\\a31&a32&a33\end{array}\right] = A=\left[\begin{array}{ccc}1&0&0\\0&1&0\\0&0&1\end{array}\right]$

$B= \left[\begin{array}{ccc}a11&a12&a13\\a21&a22&a23\\a31&a32&a33\end{array}\right] \\ B= \left[\begin{array}{ccc}(1-3(1)&1+2(2)&1+2(3)\\2+2(1)&2-3(2)&2+2(3)\\3+2(1)&3+2(2)&3-3(3)\end{array}\right] = \left[\begin{array}{ccc}-2&5&7\\4&-4&8\\5&7&-6\end{array}\right]$