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ChingWen GGB_Book
GeoGebra
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兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
錐體建築師
【案例】2013年安徽高考15题
異分母分數減法
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waaachen0001
轉動的水箱
量度長度(厘米)
橢圓3--平行四邊形法
俄罗斯方块
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Area
Centroid or Barycenter
Differential Calculus
Parallelogram
Quadrilaterals