有一種證明方法,我覺得還不錯
令0.999999999999999999999999999999.....................=S
則
10S-S=9.999999999999999999999999........................-0.99999999999999999999999...........................
=9
又10S-S=9S=9
所以S=1
siuhochung 寫到:
P.S. Do you afraid of SARS? 景棉樓有人出事