回复：请教前辈：怎么证明这个问题？

来源: 于 2005-09-04 20:32:15 [旧帖] [给我悄悄话] 本文已被阅读：次

I addressed such questione some time ago. Check my previous posts by searching "WorthIt". You will find the suggestons to handle such kind of questions.