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布丰投针实验
Author:
朱亮
GeoGebra
New Resources
找出對稱軸
畫出對稱圖形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
異分母分數減法
Discover Resources
滾動
幾何原理
圖形C
运动
错觉多边形
Discover Topics
Translation
Conic Sections
Indefinite Integral
Diagrams
Square