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P17第21题
Author:
袁正铎
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等的四邊形
三位數除以一位數（二）
柱體建築師
球體建築師
Discover Resources
正十二面體
淨敗場數機率棋盤圖
簡單動畫
碎形 - 樹枝
Pyramid (Angle between Plane HBC and HCD)
Discover Topics
Real Numbers
Diagrams
Root
Tangent Function
Integers