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[单选题]
设A,B为n阶方阵,满足等式AB=0,则必有()。
A.A=0或B=0
B.A+B=0
C.|A|=0或|B|=0
D.|A|+|B|=0
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A.A=0或B=0
B.A+B=0
C.|A|=0或|B|=0
D.|A|+|B|=0
A.|A+B|=|A|+|B|
B.|A+B|=n|A||B|
C.|kA|=k|A|
D.|-kA|=(-k)^n|A|
A.det(AB)=0,则4=O,或B=O
B.det(AB)=0,则detA=0,或detB=0
C.AB=O,则4=0,或B=O
D.AB≠O,则detA≠0,或detB≠0
设n阶方阵A满足A2一A一2I=0,则必有().
A.A=2I;
B.A=—I;
C.A—I可逆;
D.A不可逆.