1/x-1/y=2 y-x=2xy x-y=-2xy 3x+xy-3y/x-xy-y =[3(x-y)+xy]/[(x-y)-xy] =(-6xy+xy)/(-2xy-xy) =-5xy/(-3xy) =5/3
1/x-1/y=2,3x+xy-3y/x-xy-y等于多少
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