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一、难点透视 1.绝对值的意义 1)一个正数的绝对值是它本身;一个负数的绝对值是它的相反数;零的绝对值是零,这就是说任何实数的绝对值一定是非负数。 2)一个数的绝对值就是在数轴上表示这个数的点与原点的距离(也称为“绝对值的几何意义”)。|a|的意义为数轴上表示数a的点
First, the difficulty perspective 1. The meaning of absolute value 1) The absolute value of a positive number is itself; the absolute value of a negative number is its opposite number; the absolute value of zero is zero, which means that the absolute value of any real number must be negative number. 2) The absolute value of a number is the distance between the point on the axis representing this number and the origin (also referred to as “the geometric meaning of the absolute value”). The meaning of |a| is the point on the number axis that represents the number a