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矩陣AB是0矩陣——》矩陣B的任一列向量x都是方程Ax=0的解, 1.如果A列滿秩,即R(A)=s,由方程解的性質——》方程只有0解——》x的所有元素都為0——》R(B)=0——》R(A)+R(B)=s. 2.如果A非列滿秩,即R(A)=a
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