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Author:
lunhsin
GeoGebra
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兩組對邊相等的四邊形
四邊形的特性
畫出對稱圖形
三位數除以一位數（一）
【案例】2013年安徽高考15题
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內切圓半徑證明
錐體建築師 2
Copy of 固定周界的長方形的面積變化
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大斜方截半立方體
Discover Topics
Upper and Lower Sum or Riemann Sum
Exponential Functions
Equilateral Triangles
Ellipse
Planes