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中考试题中有很多属于课本例题或习题变式题,本文以一道课本例题为原型,把相关的问题编成一组变式题,既落实了基础知识,又培养了学生的解决问题的能力,达到了很好的教学效果.题目原型浙教版七年级下册第9页例题:例如图1,AE是△ABC的角平分线,已知∠B=45°,∠C=60°,求下列角的大小:(1)∠BAE;(2)∠AEB.此例题重在落实基础知识,考查学生对三角形角平分线定义的理解,解决此问题要应用三角形内角和定理.现以此题为原型,变换其条件、结论和图形,编制一组试题.
There are many examples of the middle school exams that belong to the textbook examples or exercises variants. In this paper, a textbook example as a prototype, the related issues compiled into a set of variant questions, both to implement the basic knowledge, but also cultivate the students’ ability to solve problems, For example, Figure 1, AE is the angle bisector of △ ABC, known ∠ B = 45 °, ∠ C = 60 °, seeking a good teaching effect. The following angle size: (1) ∠ BAE; (2) ∠ AEB. This example focuses on the implementation of the basic knowledge to examine students’ understanding of the definition of the triangle angle bisector, to solve this problem to use the triangle interior angle and theorem. As a prototype, change the conditions, conclusions and graphics, the preparation of a series of questions.