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在初一数学新课程教学中,经常会碰到这种类型的题：给出一些变量和常量．让学生在变量与常量的组合中去求某些角度和线段的长度．对于初学几何的学生来说,总有点摸不着头脑,不知如何下手．本文中我们结合具体例子谈一谈这类问题的常规解法及解题思路．我们先借助图1来认识变量和常量．如图1．直线CD经过直线AB上一点
In the first mathematics new curriculum teaching, often encountered this type of problem: give some variables and constants. Let students find the length of some angles and line segments in the combination of variables and constants. For beginner geometry students, it’s a bit confusing and I don’t know how to start. In this article, we talk about the general solution to this type of problem and the problem-solving ideas. We first use Figure 1 to understand variables and constants. Figure 1. Line CD passes a point on line AB