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關燈遊戲3x3 Lights Out Game
Author:
侯杰材
GeoGebra
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三位數除以一位數（二）
四邊形的特性
錐體建築師
球體建築師
畫出對稱圖形
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hihi
MathMedia150206
圓形重疊問題
勾股定理的毕氏证明
赵爽弦图
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Rhombus
Rotation
Real Numbers
Planes
Prism