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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
平均変化率
standingwave-reflection-free
正17角形 作図 regular 17-gon
sine-wave
目で見る立方体の2等分
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引力をもつ点X
正葉曲線
主成分の座標変換
二次関数のグラフの平行移動
いろいろな立体
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Expected Value
Interest Calculation
Bar Chart or Bar Graph
Line Segment
Cylinder