含绝对值不等式的证明 ,方法灵活多样 ,难度较大 .既要重视综合法、分析法、放缩法、反证法、数学归纳法等基本数学方法的应用 ,还要善于运用配凑、拆项、换元、构造、特殊化、等分区间、分类讨论等一些常用的解题技巧与策略 .此外 ,绝对值不等式还有如下两个重要性质 :性质 1 The proof with absolute value inequality is flexible and diverse, and it is more difficult. It is necessary to pay attention to the application of basic mathematics methods such as synthesis method, analysis method, deflation method, anti-evidence method, mathematical induction method, etc., as well as good use of match and disassembly items. Some commonly used problem-solving techniques and tactics such as substitution, construction, specialization, partitioning, and classification discussion. In addition, there are two important properties of absolute value inequality: Nature 1