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易错点1:数轴的概念理解错误例1数轴的三要素是什么?错解:数轴的三要素是指原点、正方向、长度单位。正解:数轴的三要素是原点、正方向和单位长度。错因分析:上面的回答错在混淆了“单位长度”和“长度单位”这两个概念。看起来只有词序不同,但实际意义不一样。“长度单位”是一个确定的量,如厘米、分米等。而“单位长度”不是确定的,它的大小可根据实际需要适当选取。
Error-prone point 1: The concept of the number of axes to understand the error Example 1 What are the three elements of the axis? Misinterpreted: The three elements of the number of axes refers to the origin, the positive direction, the length of the unit. Positive solution: The three elements of the axis are the origin, the positive direction and the unit length. Error analysis: The above answer is wrong in the confusion of the “unit length” and “length unit ” these two concepts. Looks like only the word order is different, but the actual meaning is not the same. “Length Unit ” is a certain amount, such as centimeters, decimeters and so on. The “unit length” is not certain, its size can be properly selected according to actual needs.