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Author:
chen mingchuan
GeoGebra
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球体的体积推导（优化版）
異分母分數減法
兩位數加法
錐體建築師
兩組對邊相等的四邊形
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畢氏定理倒水法
蝴蝶線ggb
複合圖形(二)
常態分布和標準差 Normal Distribution and Standard Deviation
自由落体
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Geometric Transformations
Scalene Triangles
Mode
Logarithm
Cone