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几何证明是初中数学学习的一大难点,学生在完成这类题目时,极易出现以下几种偏差:(1)无从下手,不知道用什么。(2)条件不够用,不知道缺什么。(3)条件总用偏,不知道用在哪。那么,如何修正这些偏差呢?我们要做的不仅是理顺每道题的思路,更要引导学生理解掌握“摆”“找”“标”“证”四字诀,提高自身的独立思维能力。“摆”就是摆出已知条件;“找”就是找出暗含的条件,比如,公共边(角)、对顶角,“摆”完“找”完后,
Geometric proof is a major difficulty in junior high school mathematics learning, students in the completion of such topics prone to the following types of deviation: (1) no start, do not know what to use. (2) the conditions are not enough, do not know what is missing. (3) Conditions always partial, do not know where to use. So, how to correct these deviations? What we have to do is not only to straighten out the thinking of every question, but also to guide the students to understand and grasp the words “” “” “ Jue, improve their ability to independent thinking. ”Pendulum “ is the known condition; ”Find " is to find the implied conditions, for example, the public side (angle), the top corner,