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圆锥曲线的统一定义（第二定义）
Author:
少平 朱
GeoGebra
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拼砌四邊形
兩位數加法
直角坐標平面上的旋轉變換
畫出對稱圖形
找出對稱軸
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正九邊形
五角星动画
三角函數的繪圖1
橢圓1--同心圓法
牛頓法 (Newton's Method)的副本
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Terms
Statistics
Incircle or Inscribed Circle
Scatter Plot
Probability