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三角函數的性質
Author:
yuchengda
GeoGebra
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柱體建築師
畫出對稱圖形
兩組對邊相等和有直角的四邊形
兩位數加法
球体的体积推导(优化版)
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周考最后一题
P3 平行與垂直
正立方體變菱形12面體
六芒星
探索勾股三元数
Discover Topics
Vectors
Dilation
Congruence
Similar Triangles
Equilateral Triangles