抓住所解不等式的结构特征,适当构造函数,利用函数的性质和图象解不等式,往往会优化解题过程,甚至出奇制胜,给人耳目一新的感觉。一、构造函数利用函数的性质解不等式1.利用函数的定义域解不等式 Grasping the structural features of the solution inequality, properly constructing the function, and using the nature of the function and the solution of the inequality of the image will often optimize the problem solving process, even surprisingly winning, giving people a fresh feeling. First, the constructor uses the nature of the function to solve the inequality 1. The use of the function definition domain solution inequality