有两个n阶方阵AB如果AB=CC不等于0那么能否推出AB可逆？
不能推出AB可逆。因为如果B是一个非可逆的方阵，那么AB也是非可逆的。例如，令A为一个n阶单位矩阵，B为一个非可逆的n阶方阵，那么AB=C=C不等于0，但AB是非可逆的。
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