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数学中的恒成立问题常涉及函数、数列、方程、不等式及导数方面的知识,具有形式灵活、综合性强、不同知识交汇等特点,有利于考查学生的综合解题能力,是近年来高考的一大热点。下面我主要谈谈已知某不等式恒成立,求其中的参数范围的求解方法。一、最值法分析:(1)所给不等式只有一边含有变量即为a逸f(x)(或a臆f(x))型时,且当不等式另一边的函数的最值较易求出时,可直接求出
The problem of constant establishment in mathematics often involves the knowledge of functions, series, equations, inequalities and derivatives, and has the characteristics of flexible forms, comprehensiveness and convergence of different knowledge, which is conducive to examining students’ comprehensive ability to solve problems. In recent years, A big hot spot. Below I mainly talk about known inequality constant established, seeking the solution to the range of parameters. First, the most value of law analysis: (1) The given inequality is only one side contains a variable that is a yi f (x) (or a imaginary f (x)) type, and when the inequality of the other side of the function of the more easy When out, can be directly obtained