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【多选题】
若A,B都是n阶不可逆矩阵，则下列说法正确的是_______A.
A+B是不可逆矩阵
B.
AB是可逆矩阵
C.
AB是不可逆矩阵
D.
是不可逆矩阵
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A.
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B.
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C.
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D.
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B.
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C.
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D.
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