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3 perpendicular theorem 01
Author:
tcchan
GeoGebra
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兩組對邊相等的四邊形
球体的体积推导
三位數除以一位數（二）
錐體建築師
畫出對稱圖形
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小學數學比賽 2014
不盡相異物的排列
因式分解二次方程
平移中心
马鞍面旋转
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Unit Circle
Conic Sections
Pyramid
Line Segment
Equations