对于一道有较大思维量的问题,学生往往不易找到解题的思路.其实,供学生练习和测试的数学题,它的解题思路往往是有迹可循的.这个“迹”就是题中的条件,特别是隐含的条件,也包括隐含的背景知识.这个“迹”你看得越清晰,解题思路就越显现.而学生往往不肯在“看”题上下功夫,不是没看清“这个”条件,就是没看清“那个”条件,导致解题思路受阻.对于几何题而言,添加辅助线是解决较难几何题的关键.而添加辅助线不是变魔术似的一下 For a large amount of thinking problems, students are often not easy to find a solution to the problem of thinking.In fact, for students to practice and test math problems, the problem-solving ideas are often traceable. The conditions in the question, especially the implied conditions, also include the implied background knowledge. The clearer you look at this “trace”, the more obvious the problem-solving ideas. And students often refuse to “look” The problem is not hard to see, not to see This condition is not to see the That for the geometric problems, the addition of auxiliary line is the key to solve the difficult geometry problem. And add auxiliary line is not magic like