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设A是m×n矩阵,A的秩为r(<n),则齐次线性方程组Ax=0的一个基础解系中含有解的个数为( ).

单选题
2022-04-02 22:49
A、n-1
B、n-3
C、n-7
D、n-2
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正确答案
A

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