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初中八年级奥数：面积与面积法
Author:
王俊辉
拖动A、B、C、D，改变四边形形状
GeoGebra
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長方體平面投影 (Codex版)
畫出對稱圖形
國旗 (Claude 版)
美國國旗 (Codex 版)
算柱 (兩位數)
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常態分布和標準差 Normal Distribution and Standard Deviation
圓錐體內切球
Area of Triangle
勝者即正義
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