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反射原理的副本
Author:
xiaodandan
,
藍邦偉 Blue
GeoGebra
New Resources
畫出對稱圖形
球体的体积推导
兩位數除以一位數（一）
找出對稱軸
判斷球體
Discover Resources
蒙日定理
GGBScript
縫衣針
畢氏定理證明（Ｉ）
Angles in intersecting and parallel lines
Discover Topics
Definite Integral
Division
Planes
Parametric Curves
Orthocenter