一般地,中学生在初中和高中两个阶段将面临数学课程对他们的四次大的挑战,任何一次的不适应,都可能使他们丧失对教学的学习兴趣,产生畏惧情绪,从而在两极分化中成为被淘汰者。这就是所说的四大难关。一“、四大难关”的成因立足于帮助学生顺利度过“四大难关”,教材研究的首要任务是应该搞清各个“难关”的成因。对此作宏观分析,我们容易概括出下面三个方面的成因: In general, middle school students will face four major challenges to their mathematics courses in both the junior high school and high school. Any unsuitability may cause them to lose interest in teaching and generate fear, and thus in polarization. Become eliminated. This is called the four major difficulties. The causes of the “four major difficulties” are based on helping students to get through the “four major difficulties”. The primary task of the teaching materials research is to find out the causes of each “difficulty”. For this macro analysis, we can easily summarize the causes of the following three aspects: