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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（一）
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
Discover Resources
Elementary school math
軌跡
波的叠加
Completing the Square (Part 6)
任意角
Discover Topics
Addition
Special Points
Curve Sketching
Inequalities
Rectangle