2m-{n+[4m-3(m+2n)]}-5n化简求值
问题描述:
2m-{n+[4m-3(m+2n)]}-5n化简求值
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