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直角三角形與正三角形
Author:
李春培
GeoGebra
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【案例】2013年安徽高考15题
直角坐標平面上的旋轉變換
三位數除以一位數（一）
四邉形 (四年級) 教師版
画直线等分三角形的面积
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有趣
Rectangle_04
How to draw an ennegon with ruler and compasses?
Circle
miao
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Derivative
Trigonometry
Natural Numbers
Algebra
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