在不等式中,常常会遇到以“恒成立”和“存在”为题设条件的两类求参数范围的问题.“恒成立”和“存在”问题实质上是“任意性”和“存在性”问题.在一般情况下,这两类问题总可以通过分离变量进行等价转化,化归为以下几种模式,通过求函数的最值或函数值域的确界解决.学生在学习数学的过程 In inequality, we often encounter two kinds of problems of seeking the range of parameters with the condition of “constant establishment ” and “existence ”. “Constantly established ” and “Existence ” The problem is essentially In general, these two types of problems can always be transformed equivalently by separating the variables into the following modes, by finding the value or function of the function The realms of the range are solved. Students are learning math