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双対：正二十面体と正十二面体

Author:inaguma

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小テスト
正１７角形　作図　regular 17-gon
コイン投げと樹形図
standingwave-reflection-free
目で見る立方体の2等分

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浮力と比重
新例4
等積変形と四角形
等積変形　p140　問題5　四角形を三角形に
凸多角形

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Planes
Linear Programming or Linear Optimization
Geometric Mean
Ellipse
Arithmetic Mean

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