Resposta:
Alternativa a)
Explicação passo a passo:
[tex]\displaystyle AB =\left[\begin{array}{ccc}0.1+3.3&-2.1+1.3\\0.2-3.4&-2.2+1.(-4)\end{array}\right] =\left[\begin{array}{ccc}0+9&-2+3\\0-12&-4-4\end{array}\right] =\left[\begin{array}{ccc}9&1\\-12&-8\end{array}\right][/tex]
