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GeoGebra
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四邉形 (四年級) 教師版
異分母分數減法
拼砌四邊形
四邊形的特性
【案例】2013年安徽高考15题
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車輪車輪
圍棋名人賽
橢圓軌跡 (2)
圓外冪問題
二重积分的计算-截面法求体积
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Trapezoid
Linear Equations
Right Triangles
Median Line
Polygons