(pfv) calcule as determinantes
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a) Cortamos a primeira coluna e a primeira linha, depois multiplicamos o determinante pelo primeiro termo, veja:
![\left[\begin{array}{ccc}3&5&0\\-2&1&6\\4&2&-2\end{array}\right] = \left[\begin{array}{ccc}1&6\\2&-2\\\end{array}\right] =1*(-2)-2*(-2)=2\\\\\\D=2*3=6](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26amp%3B5%26amp%3B0%5C%5C-2%26amp%3B1%26amp%3B6%5C%5C4%26amp%3B2%26amp%3B-2%5Cend%7Barray%7D%5Cright%5D+%3D++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B6%5C%5C2%26amp%3B-2%5C%5C%5Cend%7Barray%7D%5Cright%5D+%3D1%2A%28-2%29-2%2A%28-2%29%3D2%5C%5C%5C%5C%5C%5CD%3D2%2A3%3D6 "\left[\begin{array}{ccc}3&5&0\\-2&1&6\\4&2&-2\end{array}\right] = \left[\begin{array}{ccc}1&6\\2&-2\\\end{array}\right] =1*(-2)-2*(-2)=2\\\\\\D=2*3=6")
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b)![\left[\begin{array}{ccc}3&6&9\\4&7&10\\5&8&11\end{array}\right] = \left[\begin{array}{ccc}7&10\\8&11\\\end{array}\right] =7*11-10*8= -3\\\\D=-3*3=-9](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26amp%3B6%26amp%3B9%5C%5C4%26amp%3B7%26amp%3B10%5C%5C5%26amp%3B8%26amp%3B11%5Cend%7Barray%7D%5Cright%5D+%3D++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D7%26amp%3B10%5C%5C8%26amp%3B11%5C%5C%5Cend%7Barray%7D%5Cright%5D+%3D7%2A11-10%2A8%3D+-3%5C%5C%5C%5CD%3D-3%2A3%3D-9 "\left[\begin{array}{ccc}3&6&9\\4&7&10\\5&8&11\end{array}\right] = \left[\begin{array}{ccc}7&10\\8&11\\\end{array}\right] =7*11-10*8= -3\\\\D=-3*3=-9")
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Forte abraço!
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b)
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Forte abraço!
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