问题描述: 线性代数练习题5 1个回答 分类:数学 2014-10-29 问题解答: 我来补答 答:a11A21=-a11a12a33+a11a13a32a12A22=a11a12a33-a12a13a31a13A23=-a11a13a32+a12a13a31相加得0 展开全文阅读