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Author:
enming
GeoGebra
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撒针估算面积实验
中华人民共和国国旗
龙形曲线-分形龙2
科氏力 (Coriolis Force)
双心四边形
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多邊形的外角和
多邊形的切割與拼砌
對摺平行四邊形
Multiplication of Directed Numbers
圓周公式應用題2的副本
Discover Topics
Derivative
Sine
Cosine
Square
Circle