由条件可得x-y=-3xy;
(3x+2xy-3y)/(x-2xy-y)=[3(x-y)+2xy]/[(x-y)-2xy]=(-9xy+2xy)/(-3xy-2xy)=7/5
已知x分之1-y分之1=3,求分式x-2xy-y分之3x+2xy-3y的值
已知x分之1-y分之1=3,求分式x-2xy-y分之3x+2xy-3y的值
数学人气：974 ℃时间：2019-11-07 15:10:03
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