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小学数学的几何形体知识部分,有一些求线段长度、图形周长或面积的题目,如按常规思路去分析、思考,有的解法繁琐,有的无法解答。此时,家长若能针对题目的特点,辅导孩子采用有别于一般思路的方法去探索,则常会出现柳暗花明又一村的情况,现举例如下: 一、添辅助线法例1 如图(1),由边长分别为3厘米和2厘米的两个正方形组成,M、N是两个正方形边上的中点,求阴影部分的面积。
Elementary geometry knowledge part of mathematics, there are some lines for the length of the line, the shape of the image perimeter or area of the subject, such as conventional thinking to analyze, think, and some solution complicated, and some can not answer. At this point, if parents are able to explore different characteristics of the subject according to the characteristics of the subject and instruct their children to explore ways different from the general way of thinking, , Consisting of two squares with sides of 3 and 2 cm respectively. M and N are the midpoints of the two squares and find the area of the shaded area.