去绝对值符号在化简、计算、解方程、解不等式、作函数的图象等问题中常遇到,其依据是绝对值的定义不少同学只是形式上记住了定义,不会运用.下面向同学们介绍两种常用的去绝对值符号的方法. 一、当绝对值符号内的代数式的取值范围能唯一确定时,根据绝对值的定义去掉绝对值符号. Absolute value symbols are often encountered in problems such as simplifying, calculating, solving equations, solving inequalities, and making functions. The basis is the definition of absolute values. Many students just formally remember the definitions and will not apply them. Introduce to the students the two common ways to go to the absolute value symbol. First, when the absolute value of the algebraic range of values ​​can be uniquely determined, according to the definition of the absolute value to remove the absolute value of the symbol.