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苏科版七年级(修改版)教材已经使用一年多,我们在备课组活动时,结合“课标”(2011版)一起探究和商议一些教学中遇到的问题.我们把这些问题逐一进行了分类,以求与同行共同思考.问题1 n棱锥有几个顶点?这个问题曾以填空题的形式出现在作业中,学生答案有两种:n+1和1.结合教材给出的定义:棱锥的各个侧棱的公共点叫做棱锥的顶点:棱锥的侧面都是三角形.开始我们也认为顶点数为1是正确答案.经过备课组老师一起认真商议,认为三棱锥四个面都是三角形,也就是说任意三个面都可以是侧面,那么顶点是4个.因此我们认为正确的答案是:n=3时,有4个顶点;n>3时,有1个顶点.而答案:有的是顶点数为
The textbook of the seventh grade of the Suke Edition (revised version) has been used for more than one year and we explored and discussed some of the problems encountered in teaching in conjunction with the Course Standards (2011 edition) One by one to classify in order to peer thinking. Question 1 n pyramid has several vertices? This question has been filled in the form of blank in the homework, students have two answers: n +1 and 1. combined with the textbook given The common point of each side of the pyramid is called the vertex of the pyramid: the sides of the pyramid are triangles, and at the beginning we also think that the vertex number is 1, which is the correct answer.After the preparation class teacher conscientiously negotiated that the three sides of the pyramid Is a triangle, that is, any three sides can be side, then the vertex is 4. Therefore, we think the correct answer is: n = 3, there are 4 vertices; n> 3, there is a vertex. Answer: Some are the number of vertices