Mathematics
Senior High
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なんでのこの式になるのか教えてください!

1-3 1-2 1-2 1_2 1_2 1_2 1一2 II

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✨ Best Answer ✨

Σの等比数列の時の公式に当てはめてるだけです

お茶

ありがとうございます!

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