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Author:
万超杰
GeoGebra
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兩位數加法
GeoGebra笔记功能体验课件
三位數除以一位數（二）
球體建築師
畫出對稱圖形
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為甚麼二次函數中，a是正數，開口向上?
圓錐截痕
全排列
圓周_心算題01
用几何概型估计pi值
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Step Functions
Angles
Rotation
Real Numbers
Unit Circle