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johnmayhk
GeoGebra
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小数 的副本
判斷球體
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
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教學－橫切面
中點軌跡(動點在兩圓上)
正n邊形與圓上點的中點軌跡(解析)
tool
三角函數 週期、振幅變化
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Incircle or Inscribed Circle
Algebra
Variance
Similarity Transformation or Similarity
Mathematics