设Am×n,Bn×n,Cn×m其中AB=A,BC=0,r(A)=n,则|CA—B|=________.

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问题 设Am×n,Bn×n,Cn×m其中AB=A,BC=0,r(A)=n,则|CA—B|=________.

选项

答案(一1)n

解析 因AB=A,A(B—E)=0,r(A)=n,故B-E=0,B=E,且由BC=0,得C=0,故|CA—B|=|—E|=(一1)N
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