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dandelin
Author:
袁智强
GeoGebra
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常见四边形是否是双心四边形
异形操场
圓的基本性質
平行線的判定
比較五件物件的重量
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正方體
illusion 鏡射
ma_test
homework
指数函数的副本
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Cube
Plane Figures or Shapes
Similar Triangles
Centroid or Barycenter
Equations