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tao sun
GeoGebra
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判斷球體
画直线等分三角形的面积
兩位數加法
四邊形的特性
【案例】2013年安徽高考15题
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九點圓定理
橢圓
等弦則等弦心距
解題一
鉛筆畫圓
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Parallelogram
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Cube
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Rhombus