2m-{n+[4m-3(m+2n)]}-5n化简求值

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

2m-{n+[4m-3(m+2n)]}-5n化简求值
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

7

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

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