y-x-2xy=0
y-x=2xy
x-y=-2xy
(3x+xy-3y)/(y-xy-x)
=[3(x-y)+xy]/[(y-x)-xy]
=(-6xy+xy)/(2xy-xy)
=-5xy/xy
=-5
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
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