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“平面直角坐标系”是初中数学教学中的一个重要板块,这部分教学内容和学生接触过的数轴问题有一定的相似性,也是数轴的一种延伸与深化.平面直角坐标系是数学学习中的一种重要工具,也是培养学生具备基本的数形结合思想的开端.一、情境导入思考问题:在一条笔直的街道边,竖着一排等距离的路灯,小华、小红、小明的位置如图1所示,你能根据图示确切
“Plane Cartesian coordinate system” is an important part of junior middle school mathematics teaching. This part of the teaching content has certain similarities with the number axis problem that students have contacted. It is also an extension and deepening of the number axis. The plane rectangular coordinate system is mathematics. An important tool for learning is to cultivate the students’ basic idea of the combination of number and shape. First, situation introduction and reflection: In a straight street, there is a row of equal distance street lights, Xiao Hua, Xiao Hong, The location of Xiao Ming is shown in Figure 1. You can accurately