绝对值是“有理数”一章的重要概念之一,有着广泛的应用.不少同学在学习绝对值时觉得不好理解,应用时经常出错.怎样才能学好绝对值呢?一、理解定义数轴上表示数a的点到原点的距离叫作数a的绝对值,记作|a|.1.绝对值的几何意义.一个数的绝对值就是这个数在数轴上的对应点到原点的距离,由于距离总是正数或0,所以,任何一个有理数的绝对值总是非负数,即|a|≥0. Absolute value is one of the important concepts in the chapter of “Rational Numbers”, and it has a wide range of applications. Many students find it difficult to understand when learning absolute values. They often make mistakes in application. How can we learn absolute values? First, understand the definition. The distance from the point on the number axis to the origin of the number a is called the absolute value of the number a, denoted as |a|.1. The geometric meaning of the absolute value. The absolute value of a number is the corresponding point of the number on the axis to the origin Distance, since the distance is always a positive number or 0, the absolute value of any rational number is always non-negative, that is |a|≥0.