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IMO2015D

Author:Terence

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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
兩位數加法
找出對稱軸
拼砌四邊形

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內心
Lens
作業
錯角---不平行綫
Copy of 劉徽的「割圓術」

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Inequalities
Sphere
Plane Figures or Shapes
Natural Numbers
Quadratic Functions

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