我的解题教学缺少什么?

• 作 者: 吴俊杰
• 机 构: 甘肃省天水市第七中学,
• 出 处: 中学数学教学参考
• 发表日期: 2015年26期
• 关键词: 解题教学 参考答案 教学活动 相似三角形 见下文 水市 解题思路 锐角三角形 命题者 生活情境

1问题提出再次激起笔者对2013年天津市中考数学第18题第(2)问(见如下问题1)的思考,有两个原因:一是2014年天水市中考模拟第22题正是此题,学生得分率非常低。在感慨此题难的同时,笔者又想起了之前在九年级“相似三角形”的教学中曾经选择问题2(见下文)作为例题组织教学活动,两个问题之间非常明显的联系迫使笔者不得不思考自己的教学缺少什么?二是原试题提供的参考答案一直让人很难理解,虽然可以证明由参考答案作出的图形符合要求,但是“如

1 raised the question once again aroused the author of the 2013 Tianjin senior high school entrance examination math 18 (2) Q (see question 1 below) thinking, there are two reasons: First, Tianshui City, 2014 simulation 22 is the Problem, students scoring rate is very low. While feeling this difficult, I also remembered that in the previous year of Grade 9 ”Similar Triangle “ teaching, I chose Question 2 (see below) as an example to organize teaching activities. The very obvious connection between the two problems forced the author Have to think about their lack of what the teaching? Second, the original answer to the answer provided by the question has been difficult to understand, although it can be proved by the reference answer to make the graphics meet the requirements, but ”such as