Resposta :

[tex] A=\left[\begin{array}{ccc}2.1+3.1&2.1+3.2&2.1+3.3\\2.2+3.1&2.2+3.2&2.2+3.3\end{array}\right] \\ \\ \boxed{\boxed{A=\left[\begin{array}{ccc}5&8&11\\7&10&13\end{array}\right] }}[/tex]

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