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外公切線段長求法
Author:
謝易達
GeoGebra
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【案例】2013年安徽高考15题
拼砌四邊形
三位數除以一位數（二）
找出對稱軸
判斷球體
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垂直平分線
speed
circle
Gazing Cow Problem (c)
微积分-基础知识
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Multiplication
Secant Line or Secant
Equilateral Triangles
Fractal Geometry
Pythagoras or Pythagorean Theorem