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生日悖論
Author:
李春培
生日悖論
GeoGebra
New Resources
畫出對稱圖形
拼砌四邊形
四邊形的特性
兩位數除以一位數（二）
柱體建築師
Discover Resources
三角形外角和為360度
triangle
切割柏拉圖多面體
平行線(方格版)
旋转的花瓣
Discover Topics
Rational Numbers
Cosine
Parametric Curves
Triangles
Rhombus