已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值
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已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y
已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值
已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值
已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值
∵1/x-1/y=3
∴y-x=3xy
x-y=-3xy
2x+3xy-2y/x-2xy-y
=[2(x-y)+3xy]/[(x-y)-2xy]
=(-6xy+3xy)/(-3xy-2xy)
=-3xy/(-5xy)
=3/5
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