设A,B都是三阶矩阵,A=,且满足(A*)-1B=ABA+2A2z,则B=___________.

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问题 设A,B都是三阶矩阵,A=,且满足(A*)-1B=ABA+2A2z,则B=___________.

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答案[*]

解析 |A|=—3,A*=|A|A-1=一3A-1,则(A*)-1B=ABA+2A2化为一[550*]AB=ABA+2A2,注意到A可逆,得一B=BA+2A或一B=3BA+6A,则B=一6A(E+3A)-1,E+3A=
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