已知x分之1-y分之1=-3,则则代数式3x-2xy-3y分之x=3xy-y=
人气：472 ℃ 时间：2019-12-01 13:07:26
解答
x分之1-y分之1=-3
所以
(y-x)/xy=-3
y-x=-3xy
从而
3x-2xy-3y分之x+3xy-y
=（3xy+3xy）/(3×3xy-2xy)
=6/7
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