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布丰投针实验
Author:
朱亮
GeoGebra
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兩位數除以一位數（二）
算柱 (兩位數)
【案例】2013年安徽高考15题
異分母分數減法
三位數除以一位數（一）
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反演 (Inversion)
特製的門 2
External tangent
立體圖形的截面
銳角三角：tan
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Similar Triangles
Equations
Sequences and Series
Secant Line or Secant
Functions