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Author:
李春培
GeoGebra
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兩位數除以一位數（二）
四邊形的特性
四邉形 (四年級) 教師版
畫出對稱圖形
拼砌四邊形
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GGB研習作品
Solar System
Angle Between a Line and a Plane Definition 線與平面的交角 定義
劉虹圻ㄉ所有作品都在這喔~~~~
正方形纸片剪出正三角形（顶点在边上）
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Histogram
Similar Triangles
Incircle or Inscribed Circle
Volume
Indefinite Integral