Question

B) = (a i j) 2×2, em que B i j = 2 i-j
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Answer 1

$\Large\boxed{\begin{array}{l}\sf B=(b_{ij})_{2\times2},bij=2i-j\\\sf B=\begin{bmatrix}\sf b_{11}&\sf b_{12}\\\sf b_{21}&\sf b_{22}\end{bmatrix}\\\sf b_{11}=2\cdot1-1=2-1=1\\\sf b_{12}=2\cdot1-2=2-2=0\\\sf b_{21}=2\cdot2-1=4-1=3\\\sf b_{22}=2\cdot2-2=4-2=2\\\huge\sf B=\begin{bmatrix}\sf1&\sf0\\\sf3&\sf2\end{bmatrix}\end{array}}$