共50条信息
行列式\(\begin{vmatrix}1 & 4 & 7 \\ 2 & 5 & 8 \\ 3 & 6 & 9\end{vmatrix}\begin{matrix} \\ \\ \end{matrix} \)中,元素\(7\)的代数余子式的值为\((\) \()\)
若矩阵\(\begin{pmatrix}{a}_{11} & {a}_{12} \\ {a}_{21} & {a}_{22}\end{pmatrix} \)满足:\({a}_{11},{a}_{12},{a}_{21},{a}_{22}∈\left\{0,1\right\} \),且\(\begin{vmatrix}{a}_{11} & {a}_{12} \\ {a}_{21} & {a}_{22}\end{vmatrix}=0 \),则这样的互不相等的矩阵共有
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