已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值

问题描述:

已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值

设x=3t y=4t z=5t
4x+3y-2z=12t+12t-10t=14t
x+y+z=12t
所以答案是14/12=7/6