1.问题背景去年下半年至今年上半年的一年时间内,笔者参加了湖州市高中数学教师培训班的多次活动.期间既有做客的大学教授,也有省内的特级名师;既有聆听观摩,也有幸亲自上公开课的经历.尤其是参与这样广泛的交流活动,得到同僚们的点评,也观摩了不少同行们的精彩课堂! 1. Problem Background During the year from the second half of last year to the first half of this year, the author participated in many activities of the high school mathematics teacher training class in Huzhou City, during which both university professors and super-famous teachers in the province were present; Observe, also have the privilege to personally open class experience, especially in such a wide range of exchange activities, colleagues were commented, but also to observe the wonderful class of many colleagues!