数学中的定值与最值问题,历来是高考的热点。求解定值与最值的基本策略有二:一是从几何角度考虑,当题目中的条件和结论明显体现几何特征及意义时,可用图形性质来解;二是从代数角度考虑,当题中的条件和结论体现出一种明显的函数关系时,可通过建立目标函数,求其目标函数的最值。 The value of mathematics and the value of the problem has always been a hot college entrance examination. There are two basic strategies for solving the fixed value and the maximum value: First, from a geometric point of view, when the conditions and conclusions in the subject clearly reflect the geometric characteristics and meanings, the graphical properties can be used to solve the problem. Second, from the perspective of algebra, When the conditions and conclusions show a clear functional relationship, we can obtain the most value of the objective function by establishing the objective function.