顶教授，解释的很清楚，反正俺看明白啦。。。：））

你一定要多来指导！

所有跟帖： 

• 不好意思，俺教这个教了十年了。 -trivial- ♀ (138 bytes) () 04/17/2010 postreply 20:37:32

• 以后有难题就在这里请教了。 -唐宁街- ♂ (0 bytes) () 04/17/2010 postreply 20:59:57

• congrats to your daughter going to national! -A-Momy- ♀ (0 bytes) () 04/17/2010 postreply 21:04:42

• She did not get into national, she made school B team. -唐宁街- ♂ (0 bytes) () 04/17/2010 postreply 21:09:24

• which grade is she in? -A-Momy- ♀ (0 bytes) () 04/17/2010 postreply 21:10:41

• 7,this is first time she did any math outside regular class. -唐宁街- ♂ (0 bytes) () 04/17/2010 postreply 21:11:56

• that is good. .. she still has chance next year. -A-Momy- ♀ (0 bytes) () 04/17/2010 postreply 21:16:41

• 4 student (A team) represent school and individual, -唐宁街- ♂ (50 bytes) () 04/17/2010 postreply 21:33:14