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已知:x分之1-y分之1=3,求x+2xy-y分之x-2xy-y的值
人气:232 ℃ 时间:2020-06-07 21:02:12
解答
因1/x-1/y=3
(y-x)/(xy)=3
y-x=3xy,则x-y=-3xy
(x-2xy-y)/(x+2xy-y)
=(-3xy-2xy)/(-3xy+2xy)
=-5xy/-xy
=5
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