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内凹正方形
Author:
许业成
GeoGebra
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异形操场
盈利與虧蝕
中华人民共和国国旗
科赫雪花
撒针估算面积实验
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點到直線距離-3 最短發生在垂直時
三角函數
平行四邊形的特性
US Unemployment 200701~201707
相似三角形的一种动态构造.许兴华数学
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Linear Programming or Linear Optimization
Vectors 2D (Two-Dimensional)
Quadratic Functions
Centroid or Barycenter
Trigonometric Functions