1）不是所有的公式都要論證。2）那個公式是可以（不言自明的）

來源: 於 2009-10-02 12:59:54 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

0.5+0.5=1 is acceptable by most people. This indicates that not all the equations are require to prove.