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教学素材：椭圆离心率
Author:
清风拂琴，陌上花开
GeoGebra
New Resources
斐波那契螺旋弧线（表格法）
科氏力 (Coriolis Force)
折扣
正方形雪花图案
双心四边形
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正方形和長方形有甚麼特性？的副本
雙曲線漸近線
翻轉方塊(單開)
Geometry: Types of Angles 2 (幾何：角的種類 2)
折扣 例3的副本
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Means
Right Triangles
Orthocenter
Plane Figures or Shapes
Linear Programming or Linear Optimization