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\left(\begin{matrix}2&3\\5&4\end{matrix}\right)+\left(\begin{matrix}2&0\\-1&1\end{matrix}\right)
Só pode somar ou subtrair duas matrizes se ambas as matrizes tiverem o mesmo número de linhas e colunas.
\left(\begin{matrix}2+2&3\\5-1&4+1\end{matrix}\right)
Para somar duas matrizes, some os elementos correspondentes.
\left(\begin{matrix}4&3\\5-1&4+1\end{matrix}\right)
Some 2 com 2.
\left(\begin{matrix}4&3\\4&4+1\end{matrix}\right)
Some 5 com -1.
\left(\begin{matrix}4&3\\4&5\end{matrix}\right)
Some 4 com 1.