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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
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折扣
比較五件物件的重量
活动三：应用性质
圓的基本性質
三角函数 的副本
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方格紙上畫正方形4
三角函數的性質
Properties of a Rectangle
x^3导数求导
竞猜游戏：说出图中角的大小
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Conic Sections
LCM and GCD
Equilateral Triangles
Trigonometry
Numbers