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✨ Jawaban Terbaik ✨

(5ⁿ-1)-(5ⁿ⁻¹-1)
=5ⁿ-1-5ⁿ⁻¹+1
=5ⁿ-5ⁿ⁻¹
=5×5ⁿ⁻¹ -1×5ⁿ⁻¹
=(5-1)×5ⁿ⁻¹
=4×5ⁿ⁻¹

ここでしょうか?

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