Mathematics
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高1数Bの問題です
教えてください🙇‍♀️

練習 次の和を求めよ。 26 n (1) 5-1 k=1 n-1 mamoo (2) Σ3k k=1
数列

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✨ Best Answer ✨

等比数列の形に直して、公式に当てはめるとできます!

高校生

ありがとうございます🙇‍♀️

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