为啥美国学生数学很简单,做出的东西却很牛?

这篇文章里提到了这本书

http://mp.weixin.qq.com/s?__biz=MjM5ODI1OTU2MA==&mid=401831255&idx=1&sn=fa722006874f8a4d713ed7a0a9bd7cbf&scene=2&srcid=12297RLdbj4QKIVIqKmGz7CL&from=timeline&isappinstalled=0#wechat_redirect