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初中数学中有许多运用类比教学的例子.上海教育出版社六年级第一学期数学第四章第四节“扇形的面积”通常是学生在初中阶段与类比思想发生的第一次亲密接触,许多教师都会拿前两节中“弧长”的研究过程及结论与这一节的研究过程及结论进行类比.然而,听了不少教师的课后,发现不同教师的类比对象实际上大有区别.1.三种类比引思考.(1)甲老师的类比.甲老师是严格按照课本内容教学的.问:圆心角是1°的扇形面积是整个圆面积的几分之几?老师把这个圆心角是1°的扇形涂上阴影,说:显
There are many examples of the use of analog teaching in junior high school mathematics. Shanghai Education Press sixth grade first semester fourth chapter fourth chapter “fan-shaped area” is usually the first intimate contact with students in the junior high school and analogy , Many teachers will take the first two sections of “arc length ” research process and conclusions analogy with this section of the research process and conclusions.However, after listening to many teachers’ class and found that different teachers of analogy actual (1) The analogy of Teacher A. Teacher A is teaching strictly in accordance with the content of the text. Q: The fan-shaped area with a central angle of 1 ° is a fraction of the total circular area The teacher casts the shadow of a circle with a central angle of 1 °, saying: Obviously