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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
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兩組對邊相等的四邊形
球体的体积推导（优化版）
異分母分數減法
【案例】2013年安徽高考15题
球体的体积推导
Discover Resources
ex 8
使用試算表 四邊形轉轉
Copy of 峯01
圆柱截方
不规则图形平移
Discover Topics
Triangles
Quadratic Functions
Constructions
Matrices
Exponential Functions