设a1,a2,a3是非齐次线性方程组Ax=b的解,则().
A.a1+a2也是Ax=b的解
B.a1-a2也是Ax=b的解
C.a1-a2是对应的齐次线性方程组的解
D.a1+a2+a3也是Ax=b的解
正确答案是C
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