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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
行列式\(\left| \begin{matrix} 1 & 4 & 7 \\ 2 & 5 & 8 \\ 3 & 6 & 9 \\\end{matrix} \right|\)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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