已知3n-2m-1=0,求,(1)6n-4m的值;(2)(m+n)-(3m-2n-7)的值
2个回答
3n-2m-1=0 得:3n-2m=1
1、6n-4m=2(3n-2m)=2x1=2
2、(m+n)-(3m-2n-7)
=m+n-3m+2n+7
=3n-2m+7
=1+7
=8
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