(3m一2n)一(2m一3n)=?
问题描述:
(3m一2n)一(2m一3n)=?
答
是这样的,3m-2n-2m+3n
=3m-2m-2n+3n
= m+n
(3m一2n)一(2m一3n)=?
是这样的,3m-2n-2m+3n
=3m-2m-2n+3n
= m+n