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两直线垂直

Author:李晨

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【案例】2013年安徽高考15题
祖冲之的期望：内棋与外棋
球体的体积推导
探究三角形的全等條件
球体的体积推导（优化版）

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拋物線的光學性質
五邊形與三角形等積
Building Cylinders 建造圓柱體
對稱圖形
擲兩個硬幣的機率分布的副本

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Distributions
Differential Calculus
Differential Equation
Geometric Mean
Rotation

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