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三角形數
Author:
李春培
三角形數
GeoGebra
New Resources
兩位數除以一位數（一）
算柱 (兩位數)
找出對稱軸
第八周作业
【案例】圆柱体内放置一个大球六个小球
Discover Resources
不規則圖形的周界(step3)
Distributive Law of Multiplication 1 (乘法的分配率 1)
Copy of 固定面積的圖形的周界變化
密鋪2
數線
Discover Topics
Circle
Vectors 3D (Three-Dimensional)
Surface
Hypothesis Testing
Natural Numbers