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近年来,高考中的立体几何解答题从大部分规则图形到众多不规则图形,这种变化给解题带来了一些困难,图中的线线、线面、面面位置关系比较模糊,空间角更加难以作出,空间直角坐标系无从入手建立.笔者对2015年各省市的高考试卷做了系统的研究,发现了一种有效破解立体几何问题的解题策略——补形法.补形法可以看清不规则图形的原貌,从图中看清各种关系,这为解题指明了一个新的方向.下面以2015年高考试题为例,谈谈补形
In recent years, the college entrance examination in the three-dimensional geometric solution from the majority of regular graphics to a large number of irregular graphics, this change has brought some difficulties in solving the problem, the line of the line, line surface, the relationship between the surface area is rather vague, space The angle is more difficult to make, and the Cartesian coordinate system can not be set up.The author makes a systematic study on the college entrance examination papers of all provinces and cities in 2015 and finds an effective solution to the problem of three-dimensional geometric problems - You can see the original appearance of irregular shapes, see the relationship between the figure, which indicates a new direction for problem solving. The following 2015 entrance exam questions, for example, to talk about the shape