2005年江苏高考卷的第22题是一道以研究函数性质为载体,重点考查学生分类讨论思想方法掌握情况的经典题目.题目难度不算大,从考后与学生的交流当中得知,许多学生由于弄不清解答过程中的错综复杂的分类讨论而中断解题思路.究其原因,是由于对分类讨论思想方法掌握的不透彻造成的. The 22nd issue of the Jiangsu college entrance examination volume in 2005 is a classic topic that studies the classification of students’ thinking based on the nature of the function of the study, which is not a big difficulty. It is known from the examination of the students and students that many students Because of the intricacies of disaggregated categorical discussions in the process of answering the question, the reason for the disruption is due to the inaccurate mastery of the disaggregated approach to thinking.