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directed number_the age of father and son
Author:
Kenneth
GeoGebra
New Resources
科氏力 (Coriolis Force)
盈利與虧蝕
斐波那契螺旋弧线（表格法-可动态调节）
常见四边形是否是双心四边形
平行線的判定
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Artificial Neural Network
九點圓
ghseh 二次函數描點法頂點法-3
周界-平移法(教學練習一)
运动
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Geometric Transformations
Means
Area
Function Graph
Statistical Characteristics