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教学素材：双曲线离心率
Author:
清风拂琴，陌上花开
GeoGebra
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科赫雪花
圓的基本性質
盈利與虧蝕
比較五件物件的重量
第八周作业2
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Symmetric設計對稱圖案(一條對稱軸)斜2
廣義角的代換(180,360)
圓錐截痕
層層套疊的四邊形
包絡線：雙曲線
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Tangent Function
Numbers
Addition
Parametric Curves
Equations