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happy birthday
Author:
李春培
happy birthday
GeoGebra
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三位數除以一位數（二）
GeoGebra笔记功能体验课件
找出對稱軸
兩組對邊相等的四邊形
兩位數除以一位數（二）
Discover Resources
八年级奥数之双曲线
物件的平移概念
Similar triangles reasons 2
二面角的夹角
圆周长演示
Discover Topics
Cuboid
Arithmetic
Vectors 3D (Three-Dimensional)
Parabola
Line Segment