去括号,并合并同类项：:（1）2n-(2-n)+(6n-2) (2)a+3(5a-2b)-2(3a-b)

分类: 作业答案 • 2021-12-19 15:20:14

问题描述：

答

(1)=2n-2+n+6n-2 (2) =a+15a-6b-6a+2b
=9n-4 =10a-4b

答

2n-(2-n)+(6n-2)
=2n-2+n+6n-2
=9n-4
(2)a+3(5a-2b)-2(3a-b)
=a+15a-6b-6a+2b
= 10a-4b