设A为三阶矩阵,A*为A的伴随矩阵,且已知|A|=1/2,求行列式|(3A)-1-2A*|的值.
因为A-1=A*/|A|, 故A*=|A|A-1=(1/2)A-1, |(3A)-1-2A*|=|(1/3)A-1-A-1| =(-1/3)3|A-1|. =-(8/27)•1/|A| =-(16/17)
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