数形结合就是通过数(数量关系)与形(空间形式)的相互转化、互相利用来解决数学问题的一种思想方法.它既是一个重要的数学思想,又是一种常用的数学方法.有些数量关系,借助于图形的性质,可以使抽象的概念和关系直观化、形象化、简单化.适时地渗透数形结合的思想,可以达到事半功倍的效果. The combination of numbers is a way of thinking to solve mathematical problems through the mutual transformation between numbers (quantity relations) and forms (spatial forms), which is not only an important mathematical idea but also a commonly used mathematical method. Some Quantitative relationship, with the help of the nature of the graph, the concepts and relations of the abstract can be visualized, visualized and simplified, and timely and infiltrating the idea of ​​combining numbers and shapes can achieve a multiplier effect.