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1.归纳。归纳是通过对某类事物中的若干属性分析得出一般结论的思想方法。如在教学“认识圆、探究圆周率”时,指导学生有步骤地合理操作,初步形成感性认识之后,不失时机地进行归纳,使操作所获取的感性认识上升到理性认识。推导公式时,让学生注意观察屏幕上显示的由圆转化为长方形的过程,思考这个长方形的长和宽各相当圆的哪一部分,再让学生根据长方形的面积公式推导出圆的面积公式,进而归纳得到有关圆的面积
1. Induction. Induction is through the analysis of a number of attributes of certain things come to the conclusion of the general method of thinking. Such as teaching “understanding of the circle, explore the pi ”, to guide students to operate step by step, the initial formation of perceptual knowledge, seize the opportunity to carry out induction, the operation of the perceptual awareness gained to rational understanding. When deriving the formula, let the students pay attention to the process of converting from circle to rectangle displayed on the screen, and consider which part of the circle is quite round and wide, then let the student derive the area formula of the circle according to the area formula of the rectangle, and further Summarize the area of the circle