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Σk(k-1)
Author:
Bunryu Kamimura
∑k=n(n+1)/2を元に、∑k(k-1)を求める。
GeoGebra
New Resources
アステロイド
等積変形2
目で見る立方体の2等分
standingwave-reflection-fixed
二次曲線と離心率
Discover Resources
面積比
台形の倍積変形と等積変形
垂直二等分線 平行四辺形
Trochoid
切断面
Discover Topics
Exponential Functions
Special Points
Histogram
Sequences and Series
Solids or 3D Shapes