答案：x=9758,y=1666

由1/x+1/2009=1/y得到xy=2009(x-y)=7×7×41×(x-y),
设x,y的最大公因子为K,令x=Km,y=Kn,m与n互质,那么xy=2009(x-y)=7×7×41×(x-y)变为Kmn=7×7×41×(m-n),m与n互质,所以mn与m-n也互质,所以mn是7×7×41的因子；而由x,y均为四位数,所以m