回复：请教前辈：怎么证明这个问题？

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.

所有跟帖： 

• 谢谢，有那么多帖子，实在搜索不到，希望能再发一帖， -NIW66- ♂ (53 bytes) () 09/05/2005 postreply 09:23:38

• 回复：谢谢，有那么多帖子，实在搜索不到，希望能再发一帖， -WorthIt- ♀ (748 bytes) () 09/05/2005 postreply 10:20:17