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Author:
陳兪宏
艾董幾何題
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數加法
異分母分數減法
柱體建築師
算柱 (兩位數)
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平行四邊形之變奏I
Angles in pyramid
二次函數
圓的面積的副本
正方体镂空模型（通用）
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Rectangle
Continuity
Linear Equations
Constructions
Similarity Transformation or Similarity