【10秒以内に解けますか？】気づいたらあっさり解ける計算の良問！
Synopsis
おまけ問題の解説はこちら ⇒ https://youtu.be/QDd3wW1FjUo 中学入試の標準レベル問題ですが、気づけば暗算でサクッと解ける ...
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