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GeoGebra
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兩位數除以一位數(二)
畫出對稱圖形
【案例】2013年安徽高考15题
異分母分數減法
四邊形的特性
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奠基活動20141008
Probability(概率)
兩種畢氏定理的證明
正12面體內的正四面體製作
DANDELIN
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