设A是m X n矩阵,秩R (A)=r,则线性方程组AX=O有非零解的充分必要条件是
设A是m X n矩阵,秩R (A)=r,则线性方程组AX=O有非零解的充分必要条件是
A、rB、r>n
C、rD、r>m
【正确答案】:A
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