m-{n-2m+[3m-(6m+3n)+5n]}=

分类: 作业答案 • 2021-12-19 11:05:15

问题描述：

答

m-{n-2m+[3m-(6m+3n)+5n]}
=m-n+2m-[3m-(6m+3n)+5n]
=3m-n-3m+(6m+3n)-5n
=-6n+6m+3n
=6m-3n