五阶行列式D=det(aij)中应有一项? A a11a23a45a53a44 B a11a23a34a45a54 C.a11a23a35a52a44

Question

Da12a23a35a51a44

Answer 1

这类题目把握两点
1. 行标与列标1到n都出现
2. 按行标自然序排好后, 正负号由列标排列的逆序数的奇偶性确定

A 行标缺3
B 列标缺2
C 行列标全 a11a23a35a52a44 = a11a23a35a44a52
t(13542) = 0+1+2+1 = 2 正确
D 不管了

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