分类讨论是一种重要的数学思想方法,是中考的必考内容.学生在学习中经常因为忽视分类讨论思想的应用而出现问题,下面就学生在解题中出现的错误分类辨析如下,供大家参考.一、未考虑位置的变化例1如图1,A、B、C、D为矩形的四个顶点,AB=16cm,AD=6cm,动点P、Q分别从点A、C同时出发, Classification discussion is an important method of mathematics thinking. It is a compulsory part of the examination. Students often have problems in learning because of neglecting the application of classified discussion. The following analysis of students’ misclassifications in solving problems is as follows: Reference 1. First, did not consider the change in position Example 1 In Figure 1, A, B, C, D are the four vertices of the rectangle, AB = 16cm, AD = 6cm, moving points P, Q, respectively, starting from the point A, C ,