x分之1-y分之1＝3 求分式x-2xy-y分之2x＋3xy-2y的值

3/5
因为1/x-1/y=3
通分得y-x/xy=3
所以x-y=-3xy
x-2xy-y/2x+3xy-2y
=2(x-y)+3xy/(x-y)-2xy
=-6xy+3xy/-5xy
=3/5
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