二次函数是中学数学的重要内容 ,其最值问题是学生学习的难点之一 ,是历年高考的一个重要知识点 .因此 ,有必要研究解决这类问题的简明方法 .现举例说明如下 ,供参考 .1　轴线确定法根据所给区间与抛物线的对称轴的位置关系确定最值 ,是最重要最基本的方法 .例 1　求函数 f(x) The quadratic function is an important part of middle school mathematics. The question of the most value is one of the difficulties for students to learn, and it is an important knowledge point for the college entrance examination over the years. Therefore, it is necessary to study concise methods for solving such problems. Reference 1. Axis determination method The most important and most basic method is to determine the best value according to the positional relationship between the given interval and the axis of symmetry of the parabola. Example 1 Find the function f(x)