2m-｛n+[4m-3（m+2n）]｝-5n化简求值

分类: 作业答案 • 2021-12-19 11:03:10

问题描述：

答

2m-｛n+[4m-3（m+2n）]｝-5n
=2m-n-[4m-3（m+2n）]-5n
=2m-n-4m+3（m+2n）-5n
=2m-4m+3m-n+6n-5n
=m

答

=2m-[n+4m-3m-6n)-5n
=2m-n-4m+3m+6n-5n
=m(2-4+3)+n(-1+6-5)
=m

答

2m-{n+[4m-3(m+2n)]}-5n
原式=2m-{n+[4m-3m-6n]}-5n
=2m-n-4m+3m+6n-5n
=2m-4m+3m-n+6n-5n
=m

答