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圓在線段轉動
Author:
許技江
圓在線段轉動
GeoGebra
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三位數除以一位數（二）
【案例】2013年安徽高考15题
柱體建築師
畫出對稱圖形
画直线等分三角形的面积
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平面幾何
excenter of triangle
三角形外心探討
圓柱圓錐
泰勒展开式
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Similar Triangles
Random Experiments
Quadrilaterals
Straight Lines
Symmetry