2/x+2/y=1
2(x+y)/xy=1
2(x+y)=xy
(x+y)=xy/2
(2x-xy+2y)/(3x+5xy+3y)
=(xy-xy)/(13xy/2)
=0
若2/x+2/y=1,则（2x-xy+2y）/（3x+5xy+3y）=?
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