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Slope 斜率 - 概念及定義 (3)的副本
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斜率 - 概念及定義 (2)的副本
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找中點的坐標的副本
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equation of a line (linear form)的副本
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equation of a line (A, B)的副本
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三角形面積公式 1/2 bc sinA的副本
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找中點的坐標
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