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積分
Author:
chen mingchuan
GeoGebra
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平行線的判定
正方形雪花图案
科赫雪花
斐波那契螺旋弧线（表格法-可动态调节）
折扣
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立體幾何
proof76 謝旻辰
start and end clock face
畢氏定理
圆锥截面为圆椭圆双曲线抛物线的动画显示.许兴华数学
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Statistics
Differential Calculus
Plane Figures or Shapes
Rotation
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