不等式是高中数学的重要组成部分,它与其他章节联系紧密,是高考命题的重点.在不等式中,有一类问题是求参数在什么范围内不等式恒成立.恒成立条件下不等式参数的取值范围问题,涉及的知识面广,综合性强,同时数学语言抽象,如何从题目中提取可借用的知识模块往往捉摸不定,难以寻觅,是同学们 Inequality is an important part of high school mathematics, and it is closely linked with other chapters, which is the key point of college entrance examination proposition. In inequality, there is a kind of problem is to ask what range inequality holds. Problems, involving a wide range of knowledge, strong comprehensive, and mathematical language abstraction, how to extract borrowed knowledge from the title of the module is often unpredictable, hard to find, is the students