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Author:
Leung Yeeling
GeoGebra
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球体的体积推导
画直线等分三角形的面积
兩組對邊相等的四邊形
錐體建築師
異分母分數減法
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四下_面積（一）(教師版)
切線性質A
Copy of 分數與小數
多物件逐一動畫
勾股定理的证明
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Pyramid
Quadrilaterals
General Quadrilateral
Conditional Probability
Numbers