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绝对值是初中数学一个很重要的概念,也是中考和竞赛必考内容之一.然而掌握这一概念,准确解答有关绝对值的题目,关键在于正
Absolute value is a very important concept of junior high school mathematics, and it is also one of the contents of the exam and competition. However, mastering this concept and accurately answering questions about absolute value, the key lies in