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十二音符頻率比值 (未修訂)
Author:
davidhsu
GeoGebra
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盈利與虧蝕
圓的切線方程
中华人民共和国国旗
比較五件物件的重量
折扣
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General Form of Quadratic Functions(2) 二次函數的圖像：一般式(2)
畢氏定理
M2: disc/shell
GGBstar
圓內冪性質
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Angles
Equilateral Triangles
Diagrams
Numbers
General Quadrilateral