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Author:
Jimmy Ma
GeoGebra
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双心四边形
撒针估算面积实验
三角函数 的副本
祖冲之的期望：内棋与外棋
百分數及其應用
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Probability(概率）
第四冊4-1習題8(2)
yuanmianjituidao
平面切割正立方體
分苹果除法
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Fractions
Probability
Straight Lines
Volume
Translation