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数学
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预代数
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数轴
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实数和数轴
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Topics in 实数和数轴
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1
Natural Numbers
2
整数
3
Integers
4
例子
5
什么是无理数?
6
实数
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加,乘,&除
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数轴
实数和数轴
加,乘,&除
绝对值是什么?
分数
The Number Line and Cartesian Plane
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