Mathematics
Senior High
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この問題の和をまとめられません...(;´༎ຶٹ༎ຶ`)
等比数列の和の公式を使うのは分かるんですがこの場合の交差が分かりません💦

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✨ Best Answer ✨

公比は3ですk乗される値が公比です

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なるほど!!ありがとうございます´ω`*

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