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4小長方形的周界
Author:
maths_p5
GeoGebra
New Resources
中华人民共和国国旗
折扣
平行線的判定
龙形曲线-分形龙
科赫雪花
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閱讀鐘面及數字鐘（時和分）
P2 math
star1
探究判定全等三角形的条件（SAS）！
禪繞畫
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Centroid or Barycenter
Similar Triangles
Ellipse
Geometric Distribution
Volume