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✨ Best Answer ✨

(n-1)+n+(n+1)になります!
そうするともしnが5とすると
(5-1)+5+(5+1)=4+5+6
=15
=3×5 となります!

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Answers

ヒント 5=6-1
7=6+1

12=13-1
14=13+1

答え

n-1+n+n+1=n+n+n+1-1
=3n+1-1
=3n

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