已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值

分类: 作业答案 • 2021-12-19 20:37:04

问题描述：

答

(5x-xy+5y)/(3xy-x-y)=[5(x+y)-xy]/[3xy-(x+y)]
=[5(x+y)-2(x+y)]/[6(x+y)-(x+y)]
=1/2