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绝对值问题是数学学习中的一个难点,因而备受数学竞赛命题者的青睐,常见于各级各类竞赛试题之中.深刻、透彻理解绝对值的意义,并与其他知识(通常是数轴)巧妙地结合起来,是解这类题的关键.
Absolute value problem is a difficult point in mathematics learning, so it is favored by math contest propositioners. It is common in all kinds of contest questions. Deep and thorough understanding of the meaning of absolute value, and other knowledge (usually several axes). The clever combination is the key to solving such questions.