smartman: interesting. after your son wrote it, could you please post a few problems (most difficult and easiest) for us to get a feel of it? thanks in advanc ...
yuki-1217: 乖儿子~~
都市小人物: 把“Gauss Mathematics Contest”打上百度就可以看到了。
都市小人物: 是的,经常和儿子说:妈妈是你最好的朋友。儿子也把俺当成好朋友,母子俩无话不说。周边的朋友很羡慕呢 谢谢您的到访。祝好!