已知1/x+1/y=3,求分式3x-2xy+3y/ - 知识问答

已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值

1个回答

1/x+1/y=3
∴x+y=3xy
3x-2xy+3y/x+xy+y
=[3(x+y)-2xy]/[(x+y)+xy]
=(9xy-2xy)/(3xy+xy)
=7/4

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