含参不等式恒成立、存在性问题历来是高考考查的热点、难点,它们之间既有联系,又有区别,还可以相互转化.对这类问题该怎样求解呢?这类问题往往涉及数形结合、分类讨论等数学思想,主要采用分离参数法(参数能够分离)、函数最值法等方法. The existence of the inequality problem has always been the hotspot and difficulty in the examination of the college entrance examination. There are both connections and differences between them, and they can be transformed into each other. How to solve these problems? This type of problem often involves the number of Combining, classifying, discussing and other mathematical ideas, the main methods are separation of parameters (parameters can be separated), the function of the most value method.