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Author:符成岗

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圓的切線方程
直線的斜率
【案例】2013年安徽高考15题
祖冲之的期望：内棋与外棋
探究三角形的全等條件

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畢氏定理證明
指對數圖形與交點個數
圆锥侧面展开图
橢圓1--同心圓法
【圆锥曲线】圆锥曲线的名称由来

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Quadratic Functions
Planes
Natural Numbers
Histogram
Isosceles Triangles

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