最值问题是近几年中考命题的又一热点,现从近两年全国各地的中考试题中选取几例,分类说明其解法. 一、逐一计算求最值首先,拓宽一下最值的概念:同一事物的所有可能取值中,若存在最大的一个,则称为最大值,若存在最小的一个,则称为最小值. The problem of the most value is another hot spot of the examination proposition in recent years. Now we select a few cases from the middle school examination questions across the country in the past two years and classify the solution. First, calculate the value one by one First, broaden the concept of the most value: For all possible values ​​of the same thing, if there is the largest one, it is called the maximum value, if there is the smallest one, it is called the minimum value.