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某些函数在闭区间上的最值,经过等价转化,均可化为闭区间上二次函数的最值.求解的关键是按对称轴与区间的位置进行分类,本文对常见的“对称轴变化但区间确定”及“对称轴确定但区间变化”两种类型例说如下:
The equivalent value of some function in the closed interval can be converted into the maximum value of the quadratic function in the closed interval after the equivalent transformation. The key to solving is to classify the position of the symmetry axis and the interval. This article deals with the common “symmetry”. “Axis change but interval determination” and “determination of symmetry axis but interval change” are two examples: