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部分佔全部的百分率: 例3的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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球体的体积推导（优化版）
空间中两直线的位置关系
圓的基本性質
球体的体积推导
平行線的斜率
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十字立方體
test02
畢氏定理
三角形
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Algebra
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