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反射定律 Law of Reflection
Author:
W.L. Wong, Albert
GeoGebra
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球体的体积推导（优化版）
球體建築師
兩位數除以一位數（二）
異分母分數減法
判斷球體
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Rotation 旋轉變換
圓錐的截面
磁磚著色
棒形圖1
放射狀圖形(1)
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Tree Diagrams
Straight Lines
Logarithmic Functions
Poisson Distribution
Rectangle