设A,B都是三阶矩阵,A=且满足(A*)一1B=ABA+2A2,则B=________.

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问题 设A,B都是三阶矩阵,A=且满足(A*)一1B=ABA+2A2,则B=________.

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答案[*]

解析 |A|=一3,A*=|A|A一1=一3A一1,则(A*)一1B=ABA+2A2化为=ABA+2A2,注意到A可逆,得=BA+2A或一B=3BA+6A,则B=一6A(E+3A)一1
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