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1学情说明适用对象:对最值问题已有一定认知基础与分析能力的九年级学生。设计思想:一方面,最值问题是初中教学的一大难点,也是中考命题中各知识的结合点和能力考查的区分点,素有“综合性强、难度大和区分度高”等典型特点;另一方面,专题复习主要用于中考的最后冲刺,目的在于掌握方法和提升能力。因此,本着“突出重点、突破难点、立意在先、选题在后”的基本原则,本设计所选例题兼顾知识的覆盖率(详见教学设计中的标题)、问题的多样化(涵盖“路程最短、周长最小、面积
1 Description of knowledge Suitable for: ninth graders who have a cognitive foundation and analytical skills for the most value problems. Design philosophy: On the one hand, the most value problem is a major difficulty in junior high school teaching, but also in the middle school entrance examination of the combination of knowledge and ability to test the distinction point, known as Features; the other hand, thematic review is mainly used for the final test sprint, the purpose is to master the methods and enhance ability. Therefore, in line with the basic principle of ”highlighting key points, breaking difficulties, prioritizing and selecting topics in the future“, the coverage of selected examples in this design (see the title in the teaching design) and the diversification of problems (Cover ”the shortest distance, the smallest perimeter, area