没有

来源: 于 2016-02-24 18:18:42 [旧帖] [给我悄悄话] 本文已被阅读：次

let x =0.099999999999999...

then 10x = 0.999999999999999...

10x - x = 0.9   =>

9x = 0.9   =>

x = 0.1 = 1/10