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含参数不等式恒成立问题一直是高考的热点内容,也是各地模拟考试追逐的热点.这类问题其实是有规律可循的,只要抓住其本质属性,问题的求解就变得非常简单,并且可以做到触类旁通.一、分离参数法与引进“虚零点”并举分离参数是这类问题常见的处理方法,但有时分离参数后所得函数的最值比较难求,往往需要引进无法具体确定的零点(不妨称为“虚零点”),以方便问题的求解.
Constant inequality with parametric inequality has always been a hot topic in college entrance examination, and it is also a hot spot for simulation examinations all over the world. Such questions are actually followed in the law. Just by grasping its essential properties, the solution to the problem becomes very simple and can First, the separation of the parameter method and the introduction of “virtual zero ” and the separation of parameters is a common treatment of such problems, but sometimes the separation of the parameters obtained after the function of the more difficult to find, often need to introduce can not be specifically identified Zero (may wish to call “imaginary zero ”), in order to facilitate the solution of the problem.