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Multiplicamos linha por coluna:
a)![\left[\begin{array}{ccc}-3.2+ 4.(-1) &-3.1+4.0 &-3.3+4.4\\5.2+(-1).(-1)&5.1+ (-1.0)&5.3+(-1.4)\\\end{array}\right] = \left[\begin{array}{ccc}-10&-3&-3\\11&5&11\\\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-3.2%2B+4.%28-1%29+%26amp%3B-3.1%2B4.0+%26amp%3B-3.3%2B4.4%5C%5C5.2%2B%28-1%29.%28-1%29%26amp%3B5.1%2B+%28-1.0%29%26amp%3B5.3%2B%28-1.4%29%5C%5C%5Cend%7Barray%7D%5Cright%5D+%3D+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-10%26amp%3B-3%26amp%3B-3%5C%5C11%26amp%3B5%26amp%3B11%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}-3.2+ 4.(-1) &-3.1+4.0 &-3.3+4.4\\5.2+(-1).(-1)&5.1+ (-1.0)&5.3+(-1.4)\\\end{array}\right] = \left[\begin{array}{ccc}-10&-3&-3\\11&5&11\\\end{array}\right]")
b)![\left[\begin{array}{ccc}-1.(-2)+3.3&-1.1+3.4&\\1.(-2)+0.3&1.1+3.4&\\4.(-2)+5.3&4.1+5.4&\end{array}\right] = \left[\begin{array}{ccc}11&11\\-2&1\\7&24\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-1.%28-2%29%2B3.3%26amp%3B-1.1%2B3.4%26amp%3B%5C%5C1.%28-2%29%2B0.3%26amp%3B1.1%2B3.4%26amp%3B%5C%5C4.%28-2%29%2B5.3%26amp%3B4.1%2B5.4%26amp%3B%5Cend%7Barray%7D%5Cright%5D++%3D+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D11%26amp%3B11%5C%5C-2%26amp%3B1%5C%5C7%26amp%3B24%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}-1.(-2)+3.3&-1.1+3.4&\\1.(-2)+0.3&1.1+3.4&\\4.(-2)+5.3&4.1+5.4&\end{array}\right] = \left[\begin{array}{ccc}11&11\\-2&1\\7&24\end{array}\right]")
a)
b)
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Fica difícil explicar por aqui porque não tenho como enviar foto.