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五点を結ぶシュタイナー点
Author:
Bunryu Kamimura
5点ABCDEを結んだ直線の和が最短になる点を求めよ。証明:FK=BK+CK, JF+AJ=GJ, GI+IE=HI
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standingwave-reflection
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目で見る立方体の2等分
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