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教学素材：离心率相同的椭圆
Author:
清风拂琴，陌上花开
GeoGebra
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双心四边形
圓的切線方程
画直线等分三角形的面积
探究三角形的全等條件
垂直線的斜率
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waaachen
Circumcentre
平移2
ghseh 二次函數描點法左右平移-3
圓外切及內切
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Logarithmic Functions
Geometry
Inequalities
Differential Calculus
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