大家都知道实数绝对值的定义为: ■在《全日制十年制学校初中课本》第一册在引进绝对值概念之前已讲述了数轴,因此在叙述绝对值概念时,应当重视绝对值的几何意义。这样,既可以使同学加深对绝对值概念的理解,又可以开阔同学的思路,以利干进一步学习。 Everyone knows that the absolute value of real numbers is defined as: ■ In the “first-year textbook for a full-time 10-year school junior school”, the number axis was described before introducing the concept of absolute values. Therefore, when describing the concept of absolute values, attention should be paid to the geometry of absolute values. significance. In this way, students can deepen their understanding of the concept of absolute value, and can broaden their ideas to facilitate further learning.