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Author:
李春培
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GeoGebra
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異分母分數減法
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
兩位數除以一位數（二）
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Quiz on Polar Coordinates (1) 極坐標測驗1
quadrilaterals 4
對稱圖形
折扣 例2的副本
可控坐标系
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Scatter Plot
Bar Chart or Bar Graph
Conic Sections
Means
Integral Calculus