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翰林數學_2下_CH3-1_三角形的外角和
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翰林數學
GeoGebra
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画直线等分三角形的面积
四邊形的特性
三位數除以一位數（一）
拼砌四邊形
GeoGebra笔记功能体验课件
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四邊形的「等角分點」
Geometric Meaning of Derivatives
十字相乘法因式分解
會暫停的指針
Addition and Subtraction of Directed Numbers (2)
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Natural Numbers
Centroid or Barycenter
Algebra
Tree Diagrams
Calculus