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Orthocentre

Author:Big Lee

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兩組對邊相等和有直角的四邊形
畫出對稱圖形
找出對稱軸
【案例】2013年安徽高考15题
兩位數除以一位數（一）

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兩位數除法
Apollonius Problem kissing coin problem
Taylor polynomials
拋物線5--包絡線法
圆柱侧面展开图

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Statistical Characteristics
Logarithmic Functions
Parabola
Linear Equations
Cone

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