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人教版高中数学教材“不等式”一章P20绝对值不等式的性质定理:|a|-|b|≤|a+b|≤|a|+|b|,课本借助绝对值的原始定义进行证明,抽象程度高.
PEP teaching in high school mathematics textbook “inequality” chapter P20 absolute inequality of the nature of the theorem: | a | - | b | ≤ | a + b | ≤ | a | + | b |, textbooks prove with the original definition of absolute value High degree of abstraction.