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the definition of ellipse
Author:
丁明智
GeoGebra
New Resources
找出對稱軸
球体的体积推导（优化版）
画直线等分三角形的面积
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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string art
Copy of 教學－與直線有關的角
橢圓內的光線反射 獻給聰哥
用交轨法求动点的轨迹方程图.许兴华数学
双心四边形
Discover Topics
Conic Sections
Quadrilaterals
Square
Exponential Functions
Subtraction