线性代数:五阶行列式中含有因子a11a23 的项.注意是五阶不是四阶!
2个回答

若不论 项 所含的符号,有:a11a23a32a44a55、a11a23a32a45a54、a11a23a34a42a55、

a11a23a34a45a52、a11a23a35a42a54、a11a23a35a44a52 六项;

若考虑符号,则 a11a23a32a44a55 的逆序为 1

a11a23a34a45a52 的逆序为 3

a11a23a35a42a54 的逆序为 3 ,则这三项取负号,其余取正号,

∴所求项为:-a11a23a32a44a55、+a11a23a32a45a54、+a11a23a34a42a55、-a11a23a34a45a52、

-a11a23a35a42a54、+a11a23a35a44a52 .