不等式的证明方法灵活多变,综合性强,有些如用常规的代数方法,要么无从下手难以奏效,要么思维冗长过程繁琐,但若针对题设条件及其给出的数量关系进行观察、分析、联想,赋予特定的几何情境,构造与条件相适应的几何图形,利用几何直观与几何知识,则往往可使问题迅速解决.下面举例说明. The inequality proving method is flexible and comprehensive, and some of them use conventional algebraic methods, and they are either ineffective or inconvenient, but they are observing and analyzing the relationship between the conditions of the questions and their numerical relationships. Lenovo, to give a specific geometric situation, construct a geometry that adapts to the conditions, use geometric intuition and geometry knowledge, it can often make the problem quickly resolved. The following examples illustrate.