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Möbius strip
Author:
Chenwei Chen
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩位數加法
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
三位數除以一位數（一）
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餘弦定理
supplementary
straight line
tetrahedron_rotation
平面几何问题
Discover Topics
Ellipse
Median Line
Statistical Characteristics
Equilateral Triangles
Diagrams