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penrose三角形

Author:宋晓燕

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垂直線的斜率
画直线等分三角形的面积
兩位數除以一位數（一）
漂亮的摇摆曲线
【案例】2013年安徽高考15题

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內擺線
regular hexagon construction
威力彩開獎機
畢氏定理
動態軌跡與動態色彩

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Cuboid
Continuity
Surface
Sphere
Triangles

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