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ΣΣk=1+3+6+
Author:
Bunryu Kamimura
∑k(k-1)=(n-1)n(n+1)/3を使う。
GeoGebra
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コイン投げと樹形図
等積変形2
standingwave-reflection-fixed
standingwave-reflection-free
小テスト
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四角錐の二つの重心
正20面体_2
iPhone : GeoGebra Augmented Reality
作図(練習30(1))
ナーゲル線
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Statistical Characteristics
Parallelogram
Tangent Line or Tangent
Fractions
Secant Line or Secant