函数是中学数学的重点内容之一,而学好函数的基本功之一又是掌握函数图象的作法.著名数学家华罗庚教授曾说过:“数形结合万般好,数形分离万事休”.数形结合确实是中学数学中最重要的思想方法之一,要用数形结合的方法解题,首先须作出函数的图象或方程的曲线,如何作出函数的图象? The function is one of the key contents of middle school mathematics, and one of the basic functions of learning a good function is to master the practice of function images. The famous mathematician Professor Hua Luogeng once said: “The combination of numbers and shapes is as good as possible, and the separation of numbers and shapes is everything.” The combination of shapes is indeed one of the most important ways of thinking in middle school mathematics. To use a combination of numbers and shapes to solve problems, you must first make a function of the image or equation of the curve, how to make a function of the image?