m+2n+n-2m等于多少
问题描述:
m+2n+n-2m等于多少
答
m+2n+n-2m
=m-2m+2n+n
=-m+3n
m+2n+n-2m等于多少
m+2n+n-2m
=m-2m+2n+n
=-m+3n