1/x-1/y=-3 y-x+3xy=0 x=y+3xy
x+3xy-y/3x-2xy-3y=(x+3xy-y)/(3x-2xy-3y)=(6xy)/(7xy)=6/7
已知1/x-1/y=-3,则x+3xy-y/3x-2xy-3y=
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