假设r(A)=n,则方程AX=0只有零解（因为其解空间的维数=n-r(A)=0）
又AB=O,则对于B的每个列向量b,均有Ab=O
即b为方程AX=0的解,故b=O,从而B=O
与条件B非零矛盾,假设不成立,r(A)
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