从某种意义上说，一堂课有如一台戏，有开端发展，也有高潮终结。如果平铺直叙，便缺少艺术的魅力和美感。因此，教师要根据学生的认知规律，精心安排４０分钟，使教学过程成为跌宕有致，引人入脏的美的流程。１．妙趣横生的引入美。如果每节数学课的开始部分，教师能创设一定 In a sense, a lesson is like a drama, has started to develop, but also the climax of the end. If the straightforward narrative, they lack the charm and beauty of art. Therefore, teachers should be based on the cognitive laws of students, carefully arranged for 40 minutes, the teaching process into the ups and downs, the introduction of dirty beauty of the process. 1. Interesting introduction of the United States. If the beginning of each math class, teachers can create a certain