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Author:
孟宝兴
GeoGebra
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兩位數除以一位數（二）
拼砌四邊形
畫出對稱圖形
找出對稱軸
錐體建築師
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正割函數與餘割函數
Conjugate Diameter—共轭直径
異分母分數除法
平面截正六面體
六上：圆的面积公式推导
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Integers
Differential Equation
Polygons
Geometric Mean
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