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Saddle point
Author:
shawn800703
GeoGebra
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折扣
双心四边形
活动三：应用性质
正方形雪花图案
斐波那契螺旋弧线（表格法-可动态调节）
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基測試題五邊形滾動
角速度概念
双动点变速运动
物體的平面運動
k的几何意义
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Linear Equations
Straight Lines
Coordinates
Incircle or Inscribed Circle
Diagrams