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对合1
Author:
代国兴
GeoGebra
New Resources
畫出對稱圖形
四邉形 (四年級) 教師版
画直线等分三角形的面积
【案例】2013年安徽高考15题
三位數除以一位數（一）
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線對稱圖形練習2
內切圓半徑證明
fixed arc length and fixed shaded area
Proof of Pythagorean Theorem with Shearing
任意截面切割正方体
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Trigonometry
Triangles
Expected Value
Median Line
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