我们在处理某些数学问题时,通过观察、分析、类比、联想等思维过程,运用函数概念和性质构造一个适当的函数,把问题转化为一个函数问题,从而使原问题得以解决.这样的解题方法就是辅助函数法.构造函数的前提和基础是熟悉函数的概念,牢固掌握各类初等函数的性质.构造函数的过程要求我们敏锐地观察、正确地 When dealing with some mathematical problems, we solve the original problem by transforming the question into a function problem through the thinking process such as observation, analysis, analogy and association, and using the concept and nature of the function to construct an appropriate function. Problem method is the auxiliary function method. The precondition and basis of the constructor is familiar with the concept of the function, a firm grasp of the nature of various elementary functions. Constructor process requires our keen observation, correctly