1)不是所有的公式都要论证。2)那个公式是可以(不言自明的)

来源: 2009-10-02 12:59:54 [博客] [旧帖] [给我悄悄话] 本文已被阅读:

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