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在初中数学中,辅助线既是解答几何问题的重要工具,又是沟通已知条件和未知结论的重要桥梁.如何添加辅助线是学生解答几何问题的难点,许多同学常因辅助线添加不当,导致解题困难,甚至考试失分.笔者根据多年的教学经验,总结出几种常见的辅助线的作法,希望能对广大一线教师的教学有所帮助.一、回顾试题的解法下面我们先分析2015年云南省初中数学学业水平考试第22题.22.(7分)(2015·云南)如图,在矩形ABCD中,AB=4,AD=6.M,N分别是AB,CD的中点,P是AD上的
In junior high school mathematics, the auxiliary line is not only an important tool to solve the geometric problems, but also an important bridge to communicate the known conditions and the unknown.How to add the auxiliary line is the difficulty of the students to solve the geometric problems, many students often improper auxiliary line, resulting in Problem-solving difficulties, and even test scores .According to years of teaching experience, the author summed up the practice of several common lines, hoping to help the teaching of front-line teachers. First, review the test solution below Let’s analyze 2015 Yunnan Provincial Junior High School Mathematical Academic Level Examination Question 22.22 (7 points) (2015 · Yunnan) In the rectangle ABCD, AB = 4, AD = 6.M, N are the midpoint of AB, CD , P is on AD