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绝对值,是重要的基础知识,在竞赛中常出现,对于稍复杂一些的绝对值问题,多数同学感到难把握,本文介绍一些基本思路.
Absolute value is an important basic knowledge, often appearing in competitions. For a slightly more complex absolute value problem, most students find it difficult to grasp. This article introduces some basic ideas.