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动圆在定圆上滚动
Author:
yhf
GeoGebra
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四邊形的特性
兩組對邊相等的四邊形
畫出對稱圖形
異分母分數減法
錐體建築師
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過圓內C點的弦中點軌跡
優良作品2(薇如)
兩位小數
指數與對數
reflectional symmetry_3
Discover Topics
Scalene Triangles
Cube
Multiplication
Cone
Means