不等式恒成立问题是不等式中一类常见的题型,在各地的高考、模拟试题中屡见不鲜。此类问题侧重考查不等式与函数、数列、几何的综合应用,不仅知识面覆盖广,而且对基本数学思想(如化归思想、函数思想、方程思想、数形结合思想等)的应用提出了极高的要求．学生对此类问题往往感觉难以下手,事实上,此 The problem of inequality and constant establishment is a common type of problem in inequalities. It is not uncommon in local college entrance examinations and simulation tests. This type of problem focuses on examining the application of inequalities and functions, sequences, and geometries. It not only covers a wide range of knowledge, but also puts forward the application of basic mathematics (such as returning thoughts, function ideas, equations, ideas, etc.). High demand. Students often feel uncomfortable with such issues. In fact, this