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gyzel 橢圓的反射
Author:
均一
GeoGebra
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找出對稱軸
【案例】2013年安徽高考15题
兩位數加法
算柱 (兩位數)
球體建築師
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angle0428
圓與三角形的中點軌跡
捷徑問題
同心六邊形
椭圆的定义
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Ellipse
Perimeter
Division
Distributions
Arithmetic