不等式是高中数学的重点知识,也是研究数学的重要工具,高考中通常会结合函数定义域、值域(最值)、单调性,方程根与系数的关系等知识点进行考查。本文想探讨一下对于不等式中一类求变量最值(或取值范围)的问题,如何把握函数解析式(或变量之间的等量关系)介入运算的时机,优化运算策略,突破最值问题的难点。 Inequality is the key knowledge of high school mathematics, but also an important tool to study mathematics. The college entrance examination usually combines knowledge domain such as function domain, value domain (most value), monotonicity, equation root and coefficient. In this paper, we want to explore how to grasp the timing of function analysis (or equivalent relation between variables), optimize the operation strategy, and break through the most value problem for the most value (or range of values) of the first type of variables in inequality Difficulties.