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挤出一块正方形
Author:
靳道阳
GeoGebra
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龙形曲线-分形龙
正方形雪花图案
异形操场
盈利與虧蝕
常见四边形是否是双心四边形
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圖例
橢圓
三角形的面積
K1+k2
椭圆的一种简单画法.许兴华数学
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Percentages
Special Points
Subtraction
Symmetry
Centroid or Barycenter