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Author:
acchu
GeoGebra
New Resources
撒针估算面积实验
盈利與虧蝕
比較五件物件的重量
折扣
圓的基本性質
Discover Resources
工具箱
橢圓之極偶 / polarity for ellipse
ghk99a29 扇形旋轉
圓周_心算題03
正方体展开图的副本
Discover Topics
Geometry
Volume
Complex Numbers
Ellipse
Circle