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

來源: 於 2010-09-14 10:41:32 [舊帖] [給我悄悄話] 本文已被閱讀：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.