求二次函数的最值问题,归纳起来主要有四种类型:(1)轴定区间定;(2)轴定区间动;(3)轴动区间定;(4)轴动区间动.一般来说,讨论二次函数在区间上的最值,主要看区间是落在二次函数的哪一个单调区间上,从而用相应的单调性来求最值.下面通过例子具体谈一谈上述几种类型的探求方法. Find the quadratic function of the most value of the problem, summed up there are four main types: (1) set the axis of the interval; (2) set the axis of motion; (3) set the axis of motion; For the discussion of the quadratic function in the range of the most value, mainly in the range of the quadratic function fall in which monotonous interval, so as to use the corresponding monotonicity to find the most value. The following examples to talk about the above few Types of exploration methods.