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一、从一个教学实例谈起实例1大纲版教材“三垂线定理及其逆定理”课堂实录片断:师:(展示铡刀的示意图,如图1)铡刀是农民朋友不可或缺的农具,他的作用就是将秸秆等作物杆铡成短小的段.现在铡刀水平放在地面上,如果要求秸秆被铡刀铡断的截面呈圆形,请大家想想,该如何将秸秆放置在刀架上?(学生都被新颖的情境给吸引住了,并跃跃欲试……)生1:只要秸秆水平放置时保持与刀架垂直即可.师:能说说你的理由吗?生i:(面露难色)只是直觉告诉我应该是这样的.
First, from a teaching example to talk about Example 1 outline version of teaching materials “three vertical line theorem and its inverse theorem ” class record piece: Teacher: (show a schematic diagram of trowel, Figure 1) trowel is an indispensable tool for farmers friends , His role is to straw stalks and other crops into a short section now trowel level on the ground, if the required straw trowel cross section was circular, please think about how the straw placed on the turret (Students are attracted to the novel situation, and eager ...) Health 1: As long as the straw placed horizontally and the knife holder can be vertical. Teacher: Can you talk about your reasons? Health i: (surface Enraged) just intuition told me should be like this.