设n阶方阵A满足A2一A-2En=0,则A-1=_______,(A-En)-1=________,(A+2En)-1=_______.

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问题 设n阶方阵A满足A2一A-2En=0,则A-1=_______,(A-En)-1=________,(A+2En)-1=_______.

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答案[*]

解析  由A(A—En)=2En
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