You can read "BOROTHER' 1/4 answer,but

来源: 于 2011-01-09 10:14:14 [旧帖] [给我悄悄话] 本文已被阅读：次

Change X-Y=2M,X*Y=1,

.....

X=2M+Y,...Y<10^(-100)

So,Answer is 0.