二次函数作为最基本的初等函数,既简单又具有丰富的内涵和外延.学生在学习它的时候要充分掌握函数的解析式和图象特征,实现数形的自然结合,这是学习二次函数知识的一种重要思想方法.同时,二次函数知识在高中也会经常地被用到,它和初中数学之间存在着很多的衔接点,贯穿于整个高中阶段,特别是二次函数图象与性质的研究.所以,学生要深入研究 Quadratic function as the most basic elementary function, both simple and rich connotation and extension.Students in learning it to fully grasp the analytic function and image features, to achieve natural combination of numbers, which is to learn the second Function knowledge of an important way of thinking.At the same time, the quadratic function knowledge in high school will often be used, there is a lot of convergence point and junior high school mathematics, runs through the entire high school stage, especially the quadratic function graph Like the nature of the study. Therefore, students should further study