若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值 急 快 急需答案!

问题描述:

若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值 急 快 急需答案!

3(2m-n)/m+2n-m+2n/2m-n+3
=3×5-1/5+3
=18-0.2
=17.8