二次函数是重要的数学基础 ,内涵丰富 ,应用广泛 .在中学数学中 ,二次函数的身影随处可见 .不过 ,由于数学阶段性和渐进性的缘故 ,高中学生对二次函数相关知识的学习比较分散 ,教材中也欠缺系统的归纳和提升 .因此 ,学生应在适当的时候 ,及时加以总结、巩固和提高 .二次函数作 The quadratic function is an important mathematical foundation, rich in connotation, and widely used. In secondary school mathematics, quadratic functions can be seen everywhere. However, because of the stage and asymmetry of mathematics, high school students learn about quadratic function-related knowledge. It is relatively decentralized, and the teaching materials also lack systematic induction and promotion. Therefore, students should summarize, consolidate, and improve them in a timely manner.