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已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
人气:459 ℃ 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
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