Rob2233 发表于 2017-2-23 21:45 - j, X/ m% ?5 A. h$ M, R! n+ J7 Y1 c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, 4 U; D# o4 i: k这应该是比 ...
0 }+ }3 e0 {( k! Q. ~. ~* f1 Sthanks 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.