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優良作品2
Author:
Ching-Hui Chou
GeoGebra
New Resources
四邊形的特性
四邉形 (四年級) 教師版
找出對稱軸
畫出對稱圖形
直角坐標平面上的旋轉變換
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雙橢
線段與弧所構成封閉區域的填塞問題
切線性質
圓與切線
旋转的圆锥内接锥体.许兴华数学
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Median Line
LCM and GCD
Kite
Quadratic Equations
Correlation