若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
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若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
即x+y=xy/2
原式=[3(x-y)-xy]/[3xy-(x+y)]
=[3(xy/2)-xy]/[3xy-(xy/2)]
=(xy/2)/(5xy/2)
=1/5
五分之一
由条件可知 xy=2(x+y)
将上式代入后面的式子 可得（x+y）/(5x+5y)=1/5
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