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数轴把有理数和直线上的点建立了对应关系,它体现了数形结合的思想,是研究数学问题的重要工具.学习数轴要注意以下几点:一、理解定义规定了原点、正方向和单位长度的直线叫数轴.构成数轴的这三个要素的选定要根据实际问题的需要,一旦定了,就不能更改.特别是单位长度要注意:①它
Axis sets the correspondence between rational numbers and points on a straight line. It embodies the idea of combining numbers and shapes. It is an important tool for studying mathematics problems. The following points should be noted in the learning axis: 1. Understanding definitions defines the origin, positive direction, and unit The length of the line is called the number axis. The selection of these three elements that constitute the number axis is based on the needs of the actual problem. Once it is set, it cannot be changed. In particular, the unit length should be noted: 1