中学数学是一个有层次的整体,可以说是不言自明的公理。但是否用这种观点来指导教学,则是一种值得探讨的艺术。比如初中的学生往往感到平面几何入门难,原因是什么呢?从学科特点和学生的心理特点分析,主要是教学内容从对“数”的学习转入对“形”的研究,使学生面临新的领域,而初中生对识图、作图以及图形大小位置关系的理解缺乏以前学 High school mathematics is a hierarchy of the whole, it can be said is self-evident axioms. However, whether to use this view to guide teaching is an art worth exploring. For example, junior high school students often feel difficult to get started with plane geometry. What is the reason? From the characteristics of the subject and the analysis of the students’ psychological characteristics, the main content is from the study of “number” to the study of “shape” Of junior high school students lack of understanding of the concept of knowledge mapping and the size of the location of the relationship between the previous study