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教学素材：离心率相同的椭圆
Author:
清风拂琴，陌上花开
GeoGebra
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龙形曲线-分形龙2
活动三：应用性质
中华人民共和国国旗
圓的基本性質
科赫雪花
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三角形外心
優良作品2(怡雯)
直線垂直平面的條件
平移
数一数这是几边形
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Constructions
Angles
Incircle or Inscribed Circle
Prism
Sequences and Series