已知1/x+1/y=4,则x-2xy-y/2x-2y+7xy=?
1个回答
2014-01-09
展开全部
解:
1/x-1/y=4
y-x=4xy
x-y=-4xy
x-2xy-y/2x+7xy-2y
=[(x-y)-2xy]/[(2x-2y)+7xy]
=(-4xy-2xy)/(-8xy+7xy)
=-6xy/(-xy)
=6
1/x-1/y=4
y-x=4xy
x-y=-4xy
x-2xy-y/2x+7xy-2y
=[(x-y)-2xy]/[(2x-2y)+7xy]
=(-4xy-2xy)/(-8xy+7xy)
=-6xy/(-xy)
=6
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询