在2012年江苏省高考数学阅卷工作中,本人评改试卷的第15题,评改中发现学生给出了几种不同的解法,这些解法大都简化了运算,同时具有一定的技巧性,颇受启发.笔者在总结学生解法基础上,认真探讨,整理出几种不同的解法,并结合学生在解答第15题的过程中存在的问题,谈谈自己的一些看法. In 2012, Jiangsu province college entrance examination math marking, I review the first 15 papers, review found that students give several different solutions, most of these solutions simplify the operation, at the same time have a certain skill, quite inspired. On the basis of summing up the students ’solution, the author conscientiously explores and sorts out several different solutions and talks about some of their own opinions based on the students’ problems in the process of answering the fifth question.