从2012年《中小学数学》(初中版)第3期李玉荣的《“如图”与“无图”的困惑》一文中(下面称原文),我们知道“如图”就是题中提供了图形,“无图”就是题中没有提供图形,解题者根据题意画出正确图形,或者符合题意的图形复杂,可能有多种情况,需要解题者分类讨论,再分别画出每一种情况的图形. From the article “Confusion” of “No Picture” and “No Picture” in “Elementary and Middle School Mathematics” (Junior High School Edition) No. 3 in 2012 (hereinafter referred to as original text), we know that “ Is the title of the provided graphics, ”no picture " is the question did not provide graphics, solve the problem according to the problem of drawing the correct graphics, or in line with the problem of the graphics complex, there may be a variety of situations, you need to solve the problem Discuss, and then draw a graph of each situation separately.