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正立方體->菱形十二面體(滑桿動畫)
Author:
侯杰材
GeoGebra
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双心四边形
折扣
圓的切線方程
多邊形的面積
祖冲之的期望：内棋与外棋
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指數與對數的對稱性
圓上的角任務(三): 同弓形內的圓周角
y=sinx+1,y=2sinx,y=sin2x的圖形
題11
七巧板（tangram）的副本
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Inequalities
Step Functions
Random Experiments
Geometric Mean
Interest Calculation