函数是中学数学中永恒的主题 ,它的应用非常广泛 .本文针对一些非函数中的参数(或变量 )范围探求问题 ,通过观察、分析题设结构和隐含信息 ,进而以条件中的元素为“元件” ,以数学关系为“支架” ,依托创造性思维构造一种相依的辅助函数 ,再利用函数的有关性质 ,使问题化难为易 The function is an eternal theme in middle school mathematics, and its application is very extensive. This paper seeks problems for some non-function parameter (or variable) ranges, and observes, analyzes the problem structure and implicit information, and then uses the elements in the condition as “Elements” is a “bracket” in terms of mathematics, relying on creative thinking to construct a dependent auxiliary function, and making use of the relevant properties of functions to make it difficult to solve problems.