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圓錐截痕模型
Author:
陳隆期
GeoGebra
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兩位數加法
球体的体积推导（优化版）
兩位數除以一位數（一）
錐體建築師
【案例】2013年安徽高考15题
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折扣 例4
橢圓軌跡
圆锥曲线定义的拓展（卡西尼卵形线）
Solving the equations in the form ax + b = cx + d (Grouping like terms)
異分母分數減法
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Quadrilaterals
Statistical Characteristics
Square
Area
Arithmetic Operations