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四角形の各辺の中点を結ぶと？

Author:小山英憲

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コイン投げと樹形図
standingwave-reflection
目で見る立方体の2等分
二次曲線と離心率
直線の軌跡

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Circle Core
極限と漸化式(limit)
楕円に内接する六角形の作る極線
２次関数の最大最小のコピー
内分点と外分点

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Derivative
Standard Deviation
Natural Numbers
Dilation
Differential Equation

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