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笔者有幸参加了2006年连云港市中考数学试题的阅卷工作,被分配批阅第25题,所以有机会对本题做较多的思考,尤其对学生解答中的丰富的解题思路和出现的种种错误有了较多的了解,从而引发对平时的数学教学工作进行了回顾和反思,现撰写成文,以期对同仁们的教学有所启发.试题:要在宽为28 m 的海堤公路的路边安装路灯.路灯的灯臂长为3 m,且与灯柱成120°角(如图1所示),路灯采用圆锥形灯罩,灯罩的轴线与灯臂垂直.当灯罩的
I was fortunate enough to participate in the 2006 Lianyungang City Entrance Examination math test papers, was assigned 25th issue, so have the opportunity to do more thinking on this question, especially for students to answer the rich problem-solving ideas and the emergence of a variety of mistakes have A lot of understanding, which led to the usual mathematics teaching has been reviewed and reflections, is now written, in order to inspire my colleagues in teaching .Test: To be wide and 28m seawall roadside installation Street lamp Street lamp arm length of 3 m, and the lamppost into a 120 ° angle (shown in Figure 1), the use of conical lamp shade, shade axis and lamp arm vertical when the lamp shade