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一、有关绝对值的主要内容１．绝对值的代数定义：一个正实数的绝对值是它本身；一个负实数的绝对值是它的相反数；零的绝对值是零．２．绝对值的几何定义：在数轴上表示一个数的点离开原点的距离，叫做这个数的绝对值．３．绝对值的主要性质：（１）代数定义表达式：（２）一?
First, the main content of the absolute value Algebraic definition of absolute values: The absolute value of a positive real number is itself; the absolute value of a negative real number is its inverse; the absolute value of zero is zero. 2. The geometric definition of the absolute value: The distance from the origin to the point on the axis that represents a number is called the absolute value of the number. 3. The main properties of the absolute value: (1) algebraic definition of the expression: (2) a?