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Author:
李政憲
GeoGebra
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画直线等分三角形的面积
四邉形 (四年級) 教師版
拼砌四邊形
異分母分數減法
三位數除以一位數（二）
Discover Resources
圓錐的截面
directed number_the age of father and son
双动点变速运动
直角坐标系
圓周 (圖形C) 的複本
Discover Topics
Rectangle
Linear Programming or Linear Optimization
Special Points
Pythagoras or Pythagorean Theorem
Normal Distribution