n=2,your first Q is wrong. In fact t, you can choice any (n-1)

来源: 于 2010-09-14 10:41:32 [旧帖] [给我悄悄话] 本文已被阅读：次

Eqs by Math beauty.My answer is good for my copy and that every factor is same as what.Please see my last deduce.