Rob2233 发表于 2017-2-23 21:45 9 T( T6 l5 l5 x2 q! x: U( r, s如果觉得难度不够的话,可以试试加拿大公开赛(Canadian Open Mathematics Challenge)的题, 1 B8 p9 j& J( q: b' l m( y这应该是比 ...
7 h* H( S# B; T+ d1 ]) q: ` Lthanks a lot as parents, but i guess my daughter going to hate you. i won't let her know who you are. please keep sending this kind good resource for all parents.