Mathematics
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122. 次の和を, 2を使って表せ。 (G) エコナオ2・3二8.32ト0301 (9 ち+ト tv

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✨ Best Answer ✨

(1){k=1~n}Σk・3^(k-1)

(2){k=1~10}Σ2^(-k)

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