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Author:
chen mingchuan
GeoGebra
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畫出對稱圖形
兩位數加法
錐體建築師
【案例】2013年安徽高考15题
兩位數除以一位數(二)
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三角形面積.Area of Triangle
積分
zuiduan
三角形
算盘
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Angles
Subtraction
Confidence Interval
Derivative
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