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美丽的斯坦纳圆链
Author:
孟宝兴
GeoGebra
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兩組對邊相等的四邊形
兩位數加法
sanjiaohanshu
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
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幾何作圖動畫示範
反演的應用：鞋匠的小刀
Perimeter
Question 4
有趣的梯形面積問題
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Derivative
Right Triangles
Kite
Incircle or Inscribed Circle
Subtraction