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数轴,在初中数学中是最基础最重要的一部分知识,利用数轴可以巧解一类数学竞赛题.例1有理数a、b、c在数轴上的位置如图
Axis, which is the most basic and most important part of knowledge in junior high school mathematics, can solve a class of mathematical competition problems by using several axes. Example 1 The position of rational numbers a, b, and c on the number axis