对于恒成立不等式求参数范围问题,在近几年各省区的高考命题中常有出现,命题呈现形式多样化。下面就这类问题常见类型和解决,本文给出几种常一、变更主元,构造关于该主元的含参函数根据实际情况的需要,确定合适的主元(一般知道取值范围的变量看作主元),构造关于该主元的含参函数,研究该函数的性质。 For constant establishment of inequality parameters of the scope of the problem, in recent years, the province's college entrance examination propositions often appear, the proposition presents a variety of forms. The following types of common problems and solutions, this paper gives a few common, change the principal element, construct the parameter containing the principal element based on the actual situation needs to determine the appropriate elements (generally know the range of variables As the main element), constructs the parametric function with respect to the principal element and studies the properties of the function.