“数形结合”思想在一次函数中的应用是中考命题的一个热点,也是平时学习一次函数解决应用问题的一个重点.“数形结合”的中心思想就是把问题的数量关系转化为图像的性质或者把图像的性质转化为数量关系来解决问题.在解一次函数应用问题时,如果把数与形结合起来考虑,就可以使复杂的问题简单化,抽象的问题具体化. The application of the idea of ​​“combination of numbers and forms” in a function is a hot topic in the test of senior high school entrance examination and also a key point for learning a function to solve the application problem in the ordinary time. “The central idea of” combination of numbers and shapes "is to transform the quantitative relationship of problems In order to solve the problem, the nature of the image or the nature of the image can be transformed into the quantitative relation.When the problem of applying the one-way function is solved by combining the number with the shape, the complex problem can be simplified and the abstract problem can be concrete.