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笛沙格(Desargues)定理
Author:
学用数学
GeoGebra
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球体的体积推导（优化版）
兩位數加法
拼砌四邊形
錐體建築師
兩組對邊相等和有直角的四邊形
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waaachen
直线倾斜角与斜率
判斷錐體 2
指數函數的平移(1)
與兩圓相切之圓心雙曲線軌跡
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Arithmetic Mean
Rectangle
Equilateral Triangles
Statistics
Ratios