Rob2233 发表于 2017-2-23 21:45/ i z0 r+ W% t$ G* \+ t7 N, B
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,6 W: Y( p- F% |. f: c! k
这应该是比 ...
% O# W+ P# R# b& S6 U9 R- n: o9 xthanks 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.