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matrix of rotation transformation
Author:
华杰 苏
Topic:
Matrices
GeoGebra
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球体的体积推导（优化版）
三位數除以一位數（一）
錐體建築師
兩組對邊相等的四邊形
畫出對稱圖形
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平移動畫(平移加滑桿)
Quiz on Index Notation 指數記數法：測驗
Copy of Mjerenje obujma 4
用交轨法求动点的轨迹方程图.许兴华数学
钟表制作成功啦
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Rhombus
Quadrilaterals
Angles
Difference and Slope
Triangles