有理数体现了数形结合思想。平面直角坐标架起了数与形之间的桥梁。函数及其图像内容突显了数形结合的思想方法。数形结合的思想就是把问题的数量关系和空间形式结合起来考查的思想,根据解决问题的需要,给“数”的问题以直观图形的描述,揭示出问题的几何特征,变抽象为直观;给“形”的问题以数的度量,分析数据之间的关系,更能从本质上认识“形”的几何属性,简而言之“数形互相取长补短”。 Rational numbers embody the idea of ​​combining numbers and shapes. Planar rectangular coordinates set up a bridge between the number and form. Function and its image content highlight the idea of ​​combining numbers and forms. According to the need of solving the problem, the problem of “number ” is described by the intuitive graphics to reveal the geometric characteristics of the problem, and the abstract is Intuitive; To “Shape ” The problem of measuring the number, the analysis of the relationship between the data, and more essential to understand the “shape ” geometric attributes, in short, “the number complement each other”.