haitao: 不用引入pi这么复杂了 [阅读: 451] 2007-09-19 15:29:56 12^2 ==?== 9^2+6^2 144 ==?== 81+36=117 2边都除以/9 16 ==?== 13 (16-13)/16=3/16 也就是少了 1/5 左右