Rob2233 发表于 2017-2-23 21:45/ T1 E: U8 |8 W2 X( n
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,: @- `, ?& o' {- G: \& g
这应该是比 ...
/ v$ W- s! T/ F t) n: y& 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.