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共24项。
1.将该行列式前三列重复书写在该行列式的右边,可在前四列中作出两条对角线,然e5a48de588b662616964757a686964616f31333365663463后在此七列中作出相应的平行线,可得(图表一)
2.作乘积关系,可得如下八项:
a11a22a33a44,a12a23a34a41,a13a24a31a42,a14a21a32a43,a41a32a23a14,a42a33a24a11,a43a34a21a12,a44a31a22a13。这八项的符号可由它们的下标排列的逆序数确定,不难知道,此八项的符号是正负相间的。
3.同前理可得如下八项:
a11a23a34a42,a13a24a32a41,a14a22a31a43,a12a21a33a44,a41a33a24a12,a43a34a22a11,a14a32a21a13,a42a31