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Author:
李伶芳
GeoGebra
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sanjiaohanshu
美國國旗 (Codex 版)
四邊形的特性
找出對稱軸
算柱 (兩位數)
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拼出三角形
托勒密定理推廣到直線
圖A
投擲兩枚硬幣的概率
随机模拟实验（撒豆子估算π）的副本
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Prism
Line Segment
Calculus
Tangent Line or Tangent
General Quadrilateral