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Author:
赵林
GeoGebra
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兩組對邊相等的四邊形
找出對稱軸
四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
算柱 (兩位數)
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過圓內c點的弦中點軌跡
未完成
Indices 5
七巧板（tangram）的副本
圓周_心算題03
Discover Topics
Variance
Random Experiments
Tree Diagrams
Differential Equation
Vectors 3D (Three-Dimensional)