最終更新日：2025/12/05
When the three numbers 2, 3, and 6 are compared, they form a harmonic proportion that shows the second number as the harmonic mean of the first and third.
正解を見る
When the three numbers 2, 3, and 6 are compared, they form a harmonic proportion that shows the second number as the harmonic mean of the first and third.
音声機能が動作しない場合はこちらをご確認ください
編集履歴（0）
