柯西不等式是高中数学新课程的一个新增内容,是数学中一个基本而重要的不等式,是推证其它很多不等式的基础,尤其是应用柯西不等式可有效解决求最值的问题.近年来,在高考试卷中越来越多地出现可与之有关的问题,熟练掌握柯西不等式去灵活地解决问题尤其重要,往往可以收到出奇制胜事半功倍的效果.本文拟通过一些例题分析它在各方面的应用. Cauchy inequality is a new content in high school mathematics new curriculum, is a basic and important inequality in mathematics, is to infer that many other inequalities, especially the use of Cauchy inequality can effectively solve the problem of seeking the most value. , More and more questions appear in the entrance examination papers.It is especially important to master the Cauchy inequality to solve the problem flexibly.It can often receive the surprising success with less.The article is going to analyze it in various aspects application.