单选题:设α1,α2为Ax=b的解,β为对应导出组Ax=0的解,则Ax=b必有一个解为(  )

题目内容:
设α1,α2为Ax=b的解,β为对应导出组Ax=0的解,则Ax=b必有一个解为(  ) A.β+α1-α2
B.α1+α2
C.β+α1+α2
D.
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