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拋物線之極偶 / polarity for parabola
Author:
XIE Yuheng
GeoGebra
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【案例】2013年安徽高考15题
【案例】圆柱体内放置一个大球六个小球
判斷球體
三位數除以一位數（二）
畫出對稱圖形
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籐編直線與曲線
Ex5C#10
二元线性规划的图解法(练习1)
封閉區域著色
恆等式
Discover Topics
Scalene Triangles
Parallelogram
Circle
Definite Integral
Polygons