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fchengang动画1
Author:
符成岗
GeoGebra
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GeoGebra笔记功能体验课件
球体的体积推导（优化版）
四邉形 (四年級) 教師版
球體建築師
找出對稱軸
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平行四邊形對角線
王宏銘Proof93
Copy of 3S2 01a 平行四邊形 20151207
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矩形性质推论
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Random Variables
Interest Calculation
Polynomial Functions
Triangles
Surface