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复习“轴对称与等腰三角形”这一章时,我原先做了精心的准备,设想将课本提供的复习题A组、B组、C组逐一讲解或疏导,使学生掌握本章主要内容并灵活应用这些知识解决一些实际问题。但仔细研究课本习题觉得:讲这些习题是否能够达到预设的复习目标,很难把握,况且复习题中B组和C组习题有一定的难度,学生有畏惧心理,怎么办?我想:与其用众多的问题来铺垫不如用典型习题来发散,于是我从中选择了一道习题,以它为主线进行了“滚雪球”式的复习,课堂生成颇丰,感悟很深。问题:求证:有两条高相等的三角形是等腰三角形。提问:这是一道文字证明题,提问:解这种文字证明题时有哪
Review “axisymmetric and isosceles triangle ” chapter, I had done a meticulous preparation, envisaged the textbook review group questions A, B, C one by one to explain or divert, so that students master the main contents of this chapter And flexible application of this knowledge to solve some practical problems. However, a careful study of textbook exercises think: to say whether these exercises can achieve the preset goal of review, it is difficult to grasp Moreover, the review questions in the B group and the C group of exercises have a certain degree of difficulty, students have fear, how to do? I think: With a lot of problems to pave the way than to use the typical exercises to diverge, so I chose a problem, with it as the main line of the “snowball” type of review, the class generated very rich, deep understanding. Question: Proof: There are two equally high triangular isosceles triangle. Question: This is a proof-of-concept question, questioning: where is the proof of this type of proof?