设行列式中元素aij的代数余子式为Aij(i,j=1,2),则a11A21+a12A22=__________.

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问题 设行列式中元素aij的代数余子式为Aij(i,j=1,2),则a11A21+a12A22=__________.

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解析
所以有a11A12+A12A22=0.
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