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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
画直线等分三角形的面积
異分母分數減法
Discover Resources
圓的性質
explore
作業
製作對稱圖形-釘板-LEVEL 1
內擺線
Discover Topics
Intersection
Combinatorics
Incircle or Inscribed Circle
Diagrams
Inequalities