a-a = a ×c -b× c= a -b× 2=

问题描述:

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