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13-2-2-双缝干涉条纹-尤景汉
Author:
王翚
GeoGebra
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球体的体积推导
漂亮的摇摆曲线
垂直線的斜率
三位數除以一位數（二）
三位數除以一位數（一）
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已知橢圓 x^2/a^2+y^2/b^2=1 (a>b>0)
等腰，角度关系
GGB小組演示作業範例2
Version 3
ie 5
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Constructions
Geometry
Cube
Scalene Triangles
Special Points