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公切線的引入

Author:Gideon Huang

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【案例】圆柱体内放置一个大球六个小球
【案例】2013年安徽高考15题
三位數除以一位數（二）
異分母分數減法
兩組對邊相等的四邊形

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圆锥曲线的第二定义
錯角練習
密鋪5
Love
三等分点连线围成的三角形特征（唐老师）

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Random Experiments
Linear Programming or Linear Optimization
Centroid or Barycenter
Isosceles Triangles
Stochastic Process or Random Process

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