2x+3=负5y 求4x+10y-1/6x+15y的值

问题描述:

2x+3=负5y 求4x+10y-1/6x+15y的值

题目应该是这样吧
2X+3=-5Y,求 (4X+10Y-1)/(6X+15Y)吧.
唯一知道的是:2X+5Y=-3
所以
(4X+10Y-1)/(6X+15Y)= (2(2X+5Y)-1)/(3(2X+5Y)=(-7)/(-9)=7/9