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Fibonaci Clock
Author:
陳隆期
GeoGebra
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折扣
盈利與虧蝕
双心四边形
直線的斜率：水平變化 & 鉛垂變化
第八周作业3
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Angle Between a Line and a Plane Definition 線與平面的交角 定義
兩圓位置關係與公切線
雙曲線2-焦點法
变化的三角形的垂心.许兴华数学
圓錐截痕
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Coordinates
Linear Equations
Planes
Translation
Area