数学概念构成了数学知识的基础,要搞好概念的教与学,除须了解概念的定义方式外,还应了解概念的定义规则。 1.定义应是相称的,不要过宽或过窄。定义相称就是说下定义的概念与被定义的概念外延应该相同。例如,顶点在圆上,两边分别和圆相交的角叫圆周角,这是相称的。如果说顶点在圆 The concept of mathematics constitutes the foundation of mathematics knowledge. To do a good job in the teaching and learning of concepts, in addition to understanding the definition of concepts, it is also necessary to understand the definition of concepts. 1. The definition should be commensurate, not too wide or too narrow. The definition of proportionality means that the concept defined below should be the same as the defined concept extension. For example, the vertex is on a circle, and the angle at which the two sides intersect with the circle is called a circle angle, which is commensurate. If you say the vertex is in the circle