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中学生在学习图形与几何板块时,最大的难点是复杂的几何问题不知怎样做辅助线,即便记得老师讲过的做法,也不清楚为什么要这样做,所以出现记忆不牢,题目似曾相识但不知如何下手的现象.本文主要探讨一种常见的几何证明题辅助线做法:“截长补短”法,也是学生最无从下手的方法之一.那么怎样的题设条件是让我们想到用“截长补短”法的信号呢学生想到了用截长补短法,又怎样
When students are learning graphs and geometric plates, the biggest difficulty is complicated geometry problems. I do not know how to do the auxiliary line. Even if I remember the teacher’s practice, it is not clear why this should be done. Therefore, the memory is not solid, the subject is familiar but I do not know how Beginning of the phenomenon. This article mainly discusses a common method of geometric proving auxiliary line: “cut-off lengthening” method, is also one of the most inexperienced methods for students. So how to set the conditions is to think of us What is the signal of the “truncation and shortening” method that students thought of using the truncating method?