Rob2233 发表于 2017-2-23 21:45 8 A% q# b- @7 c9 i, D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, % a- o J' e9 T9 S0 m这应该是比 ...
! K" ?" x4 K/ A% _9 x) j5 D1 ythanks 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.