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在现行的初中教材中,由于一些概念在初中阶段不好准确表述,但又要学习与之相关的内容,便采取了一种描述性的方法定义相关概念,如函数、二次根式等.由于没有对概念的内涵及外延做出准确的界定,使得部分初中教师对一些概念产生了认识封闭,对于这样的概念若能跳出初中教材的圈子,换一种视角可能会得到意想不到的收获.本文拟对在初中教师中产生大面积认识封闭的两个概念谈谈自己的看法,以期引起老师们的思考.
In current junior high school textbooks, because some of the concepts are not accurately expressed in the middle school stage, but also learn the relevant content, they adopted a descriptive method to define the relevant concepts, such as functions, quadratic root etc. Due to Without defining the connotation and denotation of the concept, some junior middle school teachers have closed their cognition to some concepts, and may get unexpected gains if they jump out of the circle of junior high school textbooks. It is proposed that we should talk about our own views on the two concepts of creating a large area of knowledge among junior high school teachers so as to arouse the teachers’ thinking.