教师:理顺目录,明确知识体系,有效瞻前顾后用好教材目录的前提是教师自己要理顺目录,不仅对知识点有一个横向的视野,而且要有纵向的穿透,寻求数学的源与流,就是我们常说的要“瞻前顾后”。在教学中,要帮助学生构建知识系统,准确把 Teachers: straighten out the directory, a clear knowledge system, an effective way to make good use of the textbook directory on the premise that teachers themselves to straighten out the directory, not only has a horizontal knowledge of the point of view, but also have a longitudinal penetration, to find the source and flow of mathematics , That is what we often say “looking ahead”. In teaching, to help students build a knowledge system, accurate