立足课本常规 速解联赛试题

• 作 者: 吴永刚
• 机 构: 安徽省芜湖市南瑞实验学校,
• 出 处: 中学生数学
• 发表日期: 2017年12期
• 关键词: 托勒密定理 对应边 错型 成比例

本刊2017年1月下在24—25页,集中刊发了全国初中数学联赛第一试(A)第5题的解法研究,有的巧妙构造相似,有的应用托勒密定理,有的还需要解较复杂的无理方程.虽然精彩纷呈,却给学生一种望而却步、无法企及的感觉.其实,本题也可以用立足课本的常规解法来求解,而且运算量还比较小.希望对我们重视课本基础的学习,增强学习自信心有所帮助.

This issue in January 2017 on the 24-25 pages, published in the national junior high school mathematics League first test (A) fifth solution of the study, some cleverly constructed similar, and some use the Ptolemy theorem, and some But also need to understand the more complex unreasonable equations.Although the brilliant, but give students a prohibitive, unattainable feeling.In fact, the problem can also be based on the textbook of the conventional solution to solve, and the computation is still relatively small. I hope we pay attention Textbook based learning, enhance learning self-confidence helpful.