含参不等式恒成立与函数零点问题是近几年高考的热点问题.解决含参不等式恒成立问题的思路有:(1)将不等式问题转化为求最值问题.但有时会遇到最大值最小值点不好求的情况,导致无法求出最值或极值;(2)分离参数,再求函数的最值.有时也会遇到参数不好分离或者最值不好求的情况.解决函数零点问题通常是直接求函数图象与x轴的交点或者转化为求方程的根,往往无法直接 Constant inequality with parametric inequality and zero point in function are the hot issues in college entrance examination in recent years. The idea of ​​solving the problem of constitutive invariant is as follows: (1) The inequality problem is transformed into the most value problem, but sometimes the maximum The value is not good for the situation, resulting in unable to find the most value or extreme value; (2) separation of parameters, and then seeking the value of the function, sometimes encountered parameters are not good separation or the worst value for the situation. The zero point of the function is usually the direct intersection of the x-axis and the function image or the conversion to the root of the equation, which often can not be directly