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已知1/x-1/y=3,求(3x+4xy-3y)/(x-2xy-y)的值
人气:419 ℃ 时间:2020-04-10 01:17:37
解答
1/x-1/y通分=(y-x)/xy=3
y-x=3xy
x-y=-3xy
所以原式=[3(x-y)+4xy]/[(x-y)-2xy]
=[3(-3xy)+4xy]/[(-3xy)-2xy]
=-5xy/(-5xy)
=1
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