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Author:
Tsang Ka Chun
GeoGebra
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画直线等分三角形的面积
錐體建築師
兩位數除以一位數（二）
判斷球體
球体的体积推导（优化版）
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Apollonius Problem gergonne 0
angles sum of a triangle 3
對數函數1
Copy of 指數函數與對數函數圖形圖形(同底)
探索到两定点的距离之积为定值的点的轨迹
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Numbers
Quadratic Equations
Special Points
Trapezoid
Step Functions