构造函数 探索解题新路

Building a New Function and Exploring a New Method to the Problem

从题目本身的特点出发,构造一个辅助函数,再利用函数的特性(奇偶性,单调性,可导性等)以及函数的图象来解决问题。对培养学生认知(从特殊到一般,然后再从一般到特殊)及思想能力大有裨益。

Some problems can be solved by building a complementary function and using its character and its graph. It is good to cultivate students’ recognition and thinking ability.