Calcule o valor de X na matriz A= [1201/1369/4120/0x34] , sabendo que det(A)=100.
(Matriz na figura abaixo)
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Reduz-se primeiro a ordem do determinante pela regra de Chió.
![\left[\begin{array}{ccc}3-2.1&6-0.1&9-1.1\\1-4.2&2-4.0&0-4.1\\x-2.0&3-0.0&4-0.1\end{array}\right] = \left[\begin{array}{ccc}1&6&8\\-7&2&-4\\x&3&4\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3-2.1%26amp%3B6-0.1%26amp%3B9-1.1%5C%5C1-4.2%26amp%3B2-4.0%26amp%3B0-4.1%5C%5Cx-2.0%26amp%3B3-0.0%26amp%3B4-0.1%5Cend%7Barray%7D%5Cright%5D+%3D++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B6%26amp%3B8%5C%5C-7%26amp%3B2%26amp%3B-4%5C%5Cx%26amp%3B3%26amp%3B4%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}3-2.1&6-0.1&9-1.1\\1-4.2&2-4.0&0-4.1\\x-2.0&3-0.0&4-0.1\end{array}\right] = \left[\begin{array}{ccc}1&6&8\\-7&2&-4\\x&3&4\end{array}\right]")
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