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谢鹏
GeoGebra
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sanjiaohanshu
小数 的副本
四邉形 (四年級) 教師版
GeoGebra笔记功能体验课件
三位數除以一位數（二）
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扇形面積
正三角形尺规作图
圓的展開partI
三次函數01
密鋪4
Discover Topics
Root
Angles
Arithmetic Mean
Power Functions
Optimization Problems