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ΣΣk=1+3+6+
Author:
Bunryu Kamimura
∑k(k-1)=(n-1)n(n+1)/3を使う。
GeoGebra
New Resources
standingwave-reflection-free
standingwave-reflection-fixed
接点の作る円は内接円
コイン投げと樹形図
6章⑥三角柱の展開図
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外接五角形
平面上のベクトル
円Pの接線の直極点の軌跡
回転体 円
立方体(展開図)
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Line Segment
Equations
Sequences and Series
Square
Cuboid