Mathematics
Senior High
Resolved

教えてください🙇‍♀️

Answers

✨ Best Answer ✨

●公式を用いて

{(1/2)n(n+1)}²-n

●これを計算して

=(1/4)n²(n+1)²-n

=(1/4)n{n³+2n²+n-4}

ベルベット

ありがとうございます🙇‍♀️

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