图象问题的关键无非就是轴、点、线(斜率)、面(面积)的应用,但有些同学并不能深刻的理解图象的应用原则,造成学生乱用图象的斜率和面积来解题而带来错误,本文重点介绍图象的斜率和面积的应用原则. The key to the image problem is nothing more than the application of axes, points, lines (slope) and area (area). However, some students do not have a profound understanding of the application of the image principle, causing students to misuse the slope and area of ​​the image to solve problems Bring errors, this article focuses on the application of the principle of the slope and area of ​​the image.