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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
兩位數加法
【案例】圆柱体内放置一个大球六个小球
拼砌四邊形
兩位數除以一位數（二）
第八周作业
Discover Resources
testing
內次擺線
分形几何欣赏初步：树型图
直線排列1
堆疊正立方體 的複本
Discover Topics
Division
Vectors 3D (Three-Dimensional)
Triangles
Bar Chart or Bar Graph
Logarithmic Functions