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Flag 南韓 SouthKorea
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学用数学
GeoGebra
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平行線的判定
第八周作业2
龙形曲线-分形龙
折扣
双心四边形
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面积与面积问题
task 4
整數加減向量示意
指數圖形
百度
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Vectors
Equilateral Triangles
Centroid or Barycenter
Circle
Arithmetic