设3阶矩阵A,B满足关系式2AB-A-2B=0.证明A-E可逆.
证:由2AB-A-2B=0得2AB-A-2B+E=E整理为A(2B-E)-(2B-E)=E即(A-E)(2B-E)=E,因此A-E可逆.
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