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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
異分母分數減法
四邊形的特性
兩位數除以一位數（一）
兩位數加法
找出對稱軸
Discover Resources
SIMPLE EQUATION
斜率
三角形的面積
四年級除法
函数作图工具的副本
Discover Topics
Vectors
Subtraction
Geometric Transformations
Cuboid
Tangent Function