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x=√2+1 を x²+3x-5 へ代入し計算

(√2+1)²+3(√2+1)-5
=2+2√2+1+3√2+3-5
=1+5√5

なこなこ

ありがとうございます!😊

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字汚いですがどうぞ間違えてたらごめんなさい

なこなこ

ありがとうございます!!😊

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