不等式的证明是中学数学的重点和难点内容,教材中介绍了几种基本证明方法,应用这些方法确实能使很多问题得以解决.但在异彩多姿的不等式海洋中,时常会遇到结构独特的不等式,按常规证法不但过于繁琐,有时甚至难以奏效.根据不等式的结构特征,可以构造函数,利用函数的性质加以证明,下面介绍证明不等式的一种特殊方法——构造函数法. The proof of inequality is the key and difficult content of middle school mathematics. Several basic proof methods are introduced in the teaching materials. Applying these methods can really solve many problems. However, in the colorful and inequality ocean, we often encounter unique structures. Inequality, according to the conventional proof method is not only too cumbersome, and sometimes even difficult to work. According to the structural characteristics of inequality, you can construct a function, use the nature of the function to prove, the following describes a special method to prove inequality - constructor function method.