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四角形の各辺の中点を結ぶと？
Author:
小山英憲
GeoGebra
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二次曲線と離心率
等積変形2
コイン投げと樹形図
６章⑥三角柱の展開図
目で見る立方体の2等分
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相似１
sasasasa
集合の要素の個数
等角共役点の作る外接三角形と内接三角形の相似
数II P193 問3
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Straight Lines
Geometric Distribution
Quadrilaterals
Quadratic Equations
Mathematics