Mathematics
Senior High
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この式の解き方を途中式こみで教えてほしいです🙏

[1] r≠1 のとき 5r(r³ — 1) r-1 - 30
等比数列

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✨ Best Answer ✨

こんな感じでしょうか❓

バニラ

思い出せました!
ありがとうございます🙇🏻‍♀️

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