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F1 1.2b
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F1 1.3 a
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F1 1.3 b
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1.1 有向數及數線的概念
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1.1 有向數及數線的概念(2)
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1.1 有向數及數線的概念(3)
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1.1 有向數及數線的概念(4)
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1.1 有向數及數線的概念(5)
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1.2 有向數的加法及減法
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