a-a = a ×c -b× c= a -b× 2=a-a = a ×c -b× c= a -b× 2= 这是五年级的方程问题先答先给悬赏

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a-a = a ×c -b× c= a -b× 2=
a-a = a ×c -b× c= a -b× 2= 这是五年级的方程问题先答先给悬赏

0,c（a-b）,a-2b