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椭圆的离心率
Author:
军云
GeoGebra
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画直线等分三角形的面积
平行線的斜率
兩位數除以一位數（二）
兩位數加法
【案例】圆柱体内放置一个大球六个小球
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函數與反函數的導數關係
rectangle_tktcps
四角錐體的截面
橢圓1--同心圓法
金印的展开图
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Parametric Curves
Geometric Distribution
Fractal Geometry
Statistics
General Quadrilateral