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Author:
洪馷孺
GeoGebra
New Resources
四邉形 (四年級) 教師版
異分母分數減法
四邊形的特性
GeoGebra笔记功能体验课件
三位數除以一位數（二）
Discover Resources
厚會聚透鏡 Thick Convergent Lens
Distributive Law of Multiplication 2 (乘法的分配率 2)
圖形的周界
常见几个曲面
河內塔 3D (Tower of Hanoi 3D)
Discover Topics
Congruence
Trigonometric Functions
Geometric Mean
Circle
Random Experiments