(-a+3b)+(-4a+3b)去括号在合并同类项 3(m-2)+2(m+六分之七）去括号并同类项
问题描述：
(-a+3b)+(-4a+3b)去括号在合并同类项 3(m-2)+2(m+六分之七）去括号并同类项
答
(-a+3b)+(-4a+3b)
= -a+3b-4a+3b
= -5a+6b
3(m-2)+2(m+六分之七）
=3m-6+2m+3分之7
=5m-3分之11