二元不等式即同时存在两个变量的不等式.利用函数证明此类不等式是近几年高考比较热衷的题型之一,此类问题的特点为:问题以不等式形式呈现,而“主角”往往却是导数,因此构造函数成为证明不等式的良好“载体”.如何有效合理地构造函数是使不等式获得证明的关键.下面通 Bivariate inequality means that there are two inequalities at the same time.It is proved by function that such inequalities are one of the more passionate questions in college entrance examination in recent years. The characteristics of such questions are: the question is presented in the form of inequality, It is often a derivative, so the constructor becomes a good “vector” for proving inequalities. How to construct a function efficiently and reasonably is the key to prove the inequality.