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三角形數
Author:
李春培
三角形數
GeoGebra
New Resources
球体的体积推导
兩位數加法
三位數除以一位數（一）
異分母分數減法
判斷球體
Discover Resources
利用工作表制作二分树
函數(簡易微積分)
Locus (Two points 1)
基本作圖2
一般變換的副本
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
Discover Topics
Scatter Plot
Orthocenter
Standard Deviation
Optimization Problems
Plane Figures or Shapes