二次函数的区间最值是指二次函数在某个特定的区间上的最大(小)值,这类题往往含有参数,是高考的热点与难点,解答时常用到分类讨论与数形结合的思想.首先需要对参数的变化范围进行合理的分类,再根据参数的变化范围作出相应的图形,从图形上可以直观地看出二次函数在这个特定的区 The interval maximum value of the quadratic function refers to the maximum (small) value of the quadratic function in a certain interval. Such questions often contain parameters and are the hotspots and difficulties of the college entrance examination. The answers are often used to discuss classification and combination of numbers and shapes. The idea is to first classify the change range of the parameters reasonably, and then make corresponding graphs according to the change range of the parameters. From the graph, it can be seen intuitively that the quadratic function is in this specific area.