答：
2y+3/y=x
2y^2+3=xy
xy-2y^2=3
(x-y)(x-2y)-(2y-x)^2
=(x-y)(x-2y)-(x-2y)^2
=(x-2y)(x-y-x+2y)
=(x-2y)y
=yx-2y^2
=3虽然刚发完一分钟就找到答案了 还是谢谢你啊不客气，祝你学习进步