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Author:
lansesorry
GeoGebra
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判斷球體
兩位數加法
畫出對稱圖形
球体的体积推导（优化版）
兩組對邊相等的四邊形
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中國火柴遊戲一
平移動畫(平移加滑桿)
How to draw a square with ruler and compasses?
比較數量-1
表示數線上的位置的副本
Discover Topics
Fractions
Rotation
Variance
Perimeter
Similar Triangles