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Author:
Jianqiang He
GeoGebra
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兩位數加法
三位數除以一位數（二）
兩組對邊相等的四邊形
錐體建築師
畫出對稱圖形
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圓的展開partII
Expectation Value 期望值
黎曼和
基本作圖2
阿波羅尼斯圓 的複本
Discover Topics
Definite Integral
Hyperbola
Linear Equations
Tangent Function
Similarity Transformation or Similarity