Al凡jC︷八UB一2 1.要理解绝对值的意义 (l)几何意义:在数轴上,表示一个数的点与原点的距离,叫做这个数的绝对值.如图1图1所示,A、B、C三点所表示的数的绝对值分别为}+3}一3,}一2}一2,}O}一0. (2)代数意义:正数的绝对值是它本身,负数的绝对值是它的相反数,零的绝对值是零.可表 Al where jC {eight UB a 2 1. To understand the meaning of the absolute value (l) Geometric meaning: On the axis, the distance between the point of a number and the origin, called the absolute value of this number. Figure 1 Figure 1 The absolute values ​​of the numbers represented by the three points A, B, and C are }+3}-3,}-2}-2, and }O}-0. (2) Algebraic significance: The absolute value of a positive number is In itself, the absolute value of a negative number is its opposite number, and the absolute value of zero is zero.