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旋转曲面
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Hello Math
GeoGebra
New Resources
科赫雪花
活动三：应用性质
盈利與虧蝕
正方形雪花图案
比較五件物件的重量
Discover Resources
仿生獸
Plainmeter explained
切割線性質
transformation_rotation
勾股定理的直观证明（义务教育数学 新课标-例82）
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Surface
Arithmetic
Triangles
Polygons
Multiplication