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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
対数螺旋
接点の作る円は内接円
目で見る立方体の2等分
standingwave-plus
6章⑥三角柱の展開図
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正四面体に内接する球
内分点
漸化式と数列
(改訂版)星形は分数だった!
目で見る立方体の2等分
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Cylinder
Unit Circle
Interest Calculation
Quadratic Functions
Conic Sections