证明题。。。请帮帮忙
所有跟帖:
• 有很多办法 -haha2000- ♂ (568 bytes) () 01/28/2009 postreply 06:08:50
• or you can simply count it, if your teacher does not -idiot94- ♂ (43 bytes) () 01/29/2009 postreply 06:20:54
• 回复:证明题。。。请帮帮忙 -chang2009- ♂ (49 bytes) () 01/31/2009 postreply 04:10:53