二次函数是华师大版九年级下册数学第二十七章的内容,也是初中数学的重点和难点。这一章学生学起来比较困难,在前面的教学中笔者采用多种教学方法让学生理解,但效果还是不太理想。因此,笔者改进了教学方法,分析了学生理解能力的差异,从 Quadratic function is the content of the twenty-seventh chapter of the ninth grade undergraduate mathematics version of the Normal Normal University, but also the focus and difficulty of junior high school mathematics. This chapter students learn more difficult, in the previous teaching I use a variety of teaching methods for students to understand, but the effect is still not ideal. Therefore, I improved the teaching method, analyzed the differences in students’ ability to understand, from