早教吧作业答案频道 -->数学-->
已知1/x-1/y=2,求x-8xy-y/3x+4xy-3y的值
题目详情
已知1/x-1/y=2,求x-8xy-y/3x+4xy-3y的值
▼优质解答
答案和解析
1/x-1/y=2
(y-x)/xy=2
y-x=2xy
x-y=-2xy
原式=[(x-y)-8xy]/[3(x-y)+4xy]
=[(-2xy)-8xy]/[3(-2xy)+4xy]
=-10xy/(-2xy)
=5
(y-x)/xy=2
y-x=2xy
x-y=-2xy
原式=[(x-y)-8xy]/[3(x-y)+4xy]
=[(-2xy)-8xy]/[3(-2xy)+4xy]
=-10xy/(-2xy)
=5
看了 已知1/x-1/y=2,求x...的网友还看了以下：