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绝对值是初中数学知识的重点和难点,在学习时应注意以下几个方面,望同学们能透切理解,灵活运用.一、注意理解绝对值的几何意义数a的绝对值记作|a|,它是指数轴上表示数a的点与原点的距离.学习概念时应注意:(1)绝对值表示的是距离,因此它一定不是负值,即|a|≥0;
Absolute value is the focus and difficulty of junior high school mathematics knowledge. We should pay attention to the following aspects when we study. We hope students can understand and use it flexibly. First, pay attention to understanding the absolute value of the geometric meaning of the absolute value of a. |, It is the distance between the point on the index axis that represents the number a and the origin. When learning the concept, it should be noted that: (1) The absolute value represents the distance, so it must not be a negative value, ie |a|≥0;