3/x+1=2y
3+x=2xy
2(x+1)-y=11
2x-y=9------9+y=2x
3+x=(9+y)y------x=(9+y)y-3=0.5(9+y)
(y-0.5)(9+y)=3
做到这里,接下来由楼主自己解答.