回复：回复：My daughter's 3rd grade math. Need help...
jinjing
2010-01-17 21:02:07
( reads)
72.It is too difficult for child.8!/(4!*4!)
72.It is too difficult for child.8!/(4!*4!)
jinjing
2010-01-17 21:10:41回复：回复：回复：My daughter's 3rd grade math. Need help...