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kevin20020905
GeoGebra
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錐體建築師
三位數除以一位數（二）
GeoGebra笔记功能体验课件
四邉形 (四年級) 教師版
拼砌四邊形
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斯霍滕(Schooten)定理(與角平分線定理等價)
圈柱(可調整內半徑、外半徑，柱高)
Regular Tetrahedron
组合体的表面积1
玖数小学数学（思维拓展）
Discover Topics
Hypergeometric Distribution
Tangent Function
Random Experiments
Derivative
Rational Numbers