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長方形
Author:
Yin Kelvin Wong
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（一）
畫出對稱圖形
柱體建築師
球体的体积推导
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費氏螺旋 (試算表)
集合的小结
立体几何
切線性質A
圓周_心算題02
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Equations
Pyramid
Scalene Triangles
Boxplot
Surface