Question

construa uma matriz A=(aij)2x3 tal que aij= {j, se i=j 2i-j, se i ≠ j

Answer 1

A = $\left[\begin{array}{ccc}a11&a12&a13\\a21&a22&a23\end{array}\right]$
 A = $\left[\begin{array}{ccc}1&0&-1\\3&2&1\end{array}\right]$