已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值._数学解答

已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.

人气：292 ℃　时间：2019-10-10 06:30:34

解答

∵x-y/xy=3
∴x-y=3xy
2x+3xy-2y/x-2xy-y
=[2(x-y)+3xy]/[(x-y)-2xy]
=(6xy+3xy)/(3xy-2xy)
=9xy/(xy)
=9