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双曲线轨迹演示（第一定义）
Author:
焱 许
GeoGebra
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sanjiaohanshu
近似值：有效數字
畫出對稱圖形
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內切圓滾動有圖更新
會動的圖形
perd fr ctr bisect
二次函數中常數項所扮演的角色：向上移動的副本
兩位數加法
Discover Topics
Binomial Distribution
Scalene Triangles
Scatter Plot
Hypergeometric Distribution
Intersection