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光圈与正多边形外角和

Author:赵林

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兩組對邊相等的四邊形
柱體建築師
画直线等分三角形的面积
三位數除以一位數（二）
拼砌四邊形

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Decimal
http://www.qsir.org/?p=8853
缺角立方體
構作對稱圖形_FK1
公平的切蛋糕 Selfridge-Conway 免嫉妒分法(envy-free cake-cutting)

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Straight Lines
Probability
Angles
Constructions
Rhombus

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