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✨ Best Answer ✨

(2k+1)-2√k(k+1)
= (k+1)-2√k(k+1)+k
= (√k+1)²-2√k√k+1+(√k)²
= (√k+1-√k)²

となります。分かりにくければ、
a = √k+1、 b = √k と置いてみてください。

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