设A为三阶矩阵,detA=1/2,求det[1/(2A)-5A*]
人气:155 ℃ 时间:2020-01-31 22:56:34
解答
因为 A* = |A|A^-1 = (1/2)A^-1
所以
|(2A)^-1-5A*|
= |(1/2)A^-1-(5/2)A^-1|
= |(-2)A^-1|
= (-2)^3 |A^-1|
= -8 |A|^-1
= -16.
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