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Author:
季阳天
GeoGebra
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中华人民共和国国旗
三角函数 的副本
平行線的判定
比較五件物件的重量
撒针估算面积实验
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乘法
ie 6
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Quiz on Discriminant 判別式：測驗
放射狀圖形(1)
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Triangles
Vectors 3D (Three-Dimensional)
Vectors 2D (Two-Dimensional)
Functions
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