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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
科赫雪花
直線的斜率：水平變化 & 鉛垂變化
正方形雪花图案
三角函数 的副本
常见四边形是否是双心四边形
Discover Resources
整數加減向量示意
Parallel lines (angle of inclination and slope) v2
HOMEWORK
正多邊形各邊中點連線所圍成的圖形
老師講解6
Discover Topics
Tangent Function
Plane Figures or Shapes
Quadratic Functions
Centroid or Barycenter
Triangles