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1.(99-1-03)设n阶矩阵A的元素全为1,则A的个特征值是

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1.(98-1-03)设A为n阶矩阵,|A≠0,A为A的伴随矩阵,E为n阶单位矩阵.若 A有特征值,则(A)2+E必有特征值

1.(97-1-03)设=43B为三阶非零矩阵,且AB=O,则t=

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1.(961.03)设A是4×3矩阵,且A的秩r(4=2,而B=020,则 (AB)=

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