《普通高中数学课程标准(实验)》指出,教师应根据不同的内容目标及学生的实际情况,给学生留下延伸、拓展的空间和时间.在苏教版数学教材中,有许多开放性和探索性的问题,特别是一些课后习题,都是很典型的,是经过精选的,具有代表性的.对课本习题进行合理而有度地剖析、变式、延伸、推广、拓展、纵横联系,不仅能加深对概念、公式、定理的理 “Ordinary high school mathematics curriculum standards (experiment)” pointed out that teachers should be based on different content goals and the actual situation of students, leaving students extended and expanded space and time in the Sujiao version of mathematics textbooks, there are many open and Exploratory problems, especially after-school exercises, are typical, well-chosen and representative, and reasonably and quantitatively analyzed, practiced, extended, promoted and expanded textbook exercises Contact, not only can deepen the concept, formula, theorem of reason