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椭圆的定义
Author:
GeoGebra Institute of WuXi
GeoGebra
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兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
四邊形的特性
畫出對稱圖形
錐體建築師
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二次曲線-2.拋物線
How to draw an ennegon with ruler and compasses?
椭圆两个焦点与椭圆上点的连线
三棱锥的三视图的副本
第二章 导数定义引例（蜂群增长）
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Ellipse
Conditional Probability
Variance
Logarithmic Functions
Rational Numbers