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✨ Best Answer ✨

ア 2n+3
イ 2n+5
ウ (2n+1)+(2n+3)+(2n+5)
  =6n+9
  =3(2n+3)
nは整数だから、3(2n+3)は3の倍数である。

中川

ありがとうございます!
分かりました✨💦

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