Mathematics
Senior High
Resolved
この上の式から下の式への変換がどうしてもできません💦💦
途中式も含めてどうしたらいいか教えてくれませんか🙇♀️
n
4Σ k³ = n²+n(n + 1)(2n+1)−2n(n+1)+n
k=1
n
3
4k³={n(n+1)}²
k=1
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ありがとうございました😭