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Jiawen Yun
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Jiawen Yun
GeoGebra
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近似值：有效數字
小数 的副本
兩組對邊相等和有直角的四邊形
拼砌四邊形
兩組對邊相等的四邊形
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荒島尋寶
摩天輪
椭圆的生成
伍四红 圆与正方形 面积同周长比较
劉徽的「割圓術」的副本
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Special Points
Volume
Arithmetic Mean
Multiplication
Linear Functions