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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
New Resources
直角坐標平面上的旋轉變換
四邊形的特性
找出對稱軸
兩組對邊相等的四邊形
畫出對稱圖形
Discover Resources
我不知道我在幹嘛
管路流量分析
Parallelogram
时钟（序列文本）
椭圆的定义
Discover Topics
Limits
Set Theory
Calculus
Circumcircle or Circumscribed Circle
Percentages