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Utilizarei a Regra de Saurrus para responder à questão:
![\left[\begin{array}{ccc}2&0&1\\4&0&2\\9&0&-3\end{array}\right] \left\begin{array}{ccc}2&0\\4&0\\9&0\end{array}\right \\ \\ \\ -9*0*1=0 \\ 0*2*2=0 \\ -(-3)*4*0=0 \\ \\ 1*4*0=0 \\ 0*2*9=0 \\ 2*0*(-3)=0 \\ \\ Det=0+0+0+0+0+0=0 \\ \\ Det=0](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2%26amp%3B0%26amp%3B1%5C%5C4%26amp%3B0%26amp%3B2%5C%5C9%26amp%3B0%26amp%3B-3%5Cend%7Barray%7D%5Cright%5D+++%5Cleft%5Cbegin%7Barray%7D%7Bccc%7D2%26amp%3B0%5C%5C4%26amp%3B0%5C%5C9%26amp%3B0%5Cend%7Barray%7D%5Cright+%5C%5C+%5C%5C++%5C%5C+-9%2A0%2A1%3D0+%5C%5C+0%2A2%2A2%3D0+%5C%5C+-%28-3%29%2A4%2A0%3D0+%5C%5C++%5C%5C+1%2A4%2A0%3D0+%5C%5C+0%2A2%2A9%3D0+%5C%5C+2%2A0%2A%28-3%29%3D0+%5C%5C++%5C%5C+Det%3D0%2B0%2B0%2B0%2B0%2B0%3D0+%5C%5C++%5C%5C+Det%3D0 "\left[\begin{array}{ccc}2&0&1\\4&0&2\\9&0&-3\end{array}\right] \left\begin{array}{ccc}2&0\\4&0\\9&0\end{array}\right \\ \\ \\ -9*0*1=0 \\ 0*2*2=0 \\ -(-3)*4*0=0 \\ \\ 1*4*0=0 \\ 0*2*9=0 \\ 2*0*(-3)=0 \\ \\ Det=0+0+0+0+0+0=0 \\ \\ Det=0")
O det=0
O det=0
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