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yangzherui
GeoGebra
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折扣
撒针估算面积实验
龙形曲线-分形龙
活动三:应用性质
平行線的判定
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Apollonius Problem 8 CLL homo 12
Copy of 部分佔全部的百分率: 例1
量角器
验证2
自學練習_兩位數乘三位數
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Special Points
Arithmetic
Reflection
Linear Equations
Pyramid