已知1⼀x+1⼀y=3,求分式3x-2xy+3y⼀x+xy+y的值

2024-12-18 17:48:07
推荐回答(1个)
回答1:

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