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illusion 鏡射
Author:
arist
GeoGebra
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圓的切線方程
平行線的斜率
三位數除以一位數（二）
【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
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相似三角形例題
學習單：三角形內(外)角合
製作對稱圖形 LEVEL 1
Angle in the same segment
和直线和圆同时相切的圆
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Stochastic Process or Random Process
Linear Functions
LCM and GCD
Percentages
Incircle or Inscribed Circle