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함께 풀고 싶은 문제
나도 수학쌤 문장제 문제를 변형해 문제를 내는 곳입니다.
[문장제 문제&개념응용] 호두의 모험 15-에필로그:이상한 곳으로 새는 이야기
수학동아 2021.12.15 06:22 조회 619
문제 푼 사람 0명
공유하기
페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

그냥 스파이더맨 노 웨이 홈 시사회가 오늘이었고, 이야기 전개가 안되서 잠깐 이야기가 샐본론에서 잠시 벗어납니다. 어느 날 스파이더맨은 닥터 스트레인지를 찾아가려다가 실수로 이름이 비슷한 닥터 수트레인지를 찾아갔다. 그래서 모두가 자신의 정체를 잇게 해 달라고 했는데, 닥터 수트레인지가 수학 마법을 사용하기 위해서 문제를 풀라고 한다.

<문제>집합 A={1, 2, 3, 4, 5, 6, 7, 8, 9, 10}이다. 함수 f:A->A는 일대일 대응이고, f(f(x))=x, |f(x)-x|>1이다. 이때, f의 개수는?

스파이더맨은 945라고 답했는데, 오답이어서 주문이 실패했다. 그때, 옆집에 사는 닥터 스트레인지가 와서 말했다. "답이 틀려서 이제 멀티버스가 충돌하고 있어!!"

문제의 진짜 답은 무엇일까?

이 문제 어떠셨나요?

글쎄요

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  •  
    수학동아 Lv.8 2021.12.15 06:23

    스토리 전개가 안 되서 걍 막장 전개 하기 위해 시즌 2로 돌아오겠습니다.

    아, 그리고 혹시 저보다 먼저 보시는 분들은 일요일까지 스파이더맨: 노 웨이 홈 스포하지 말아주세요. 제발.....

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    다시 도전
    Amath Lv.8 2021.12.17 02:02 비밀댓글
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    •  
      수학동아 Lv.8 2021.12.18 07:45

      f는 집합이 아니라 함수인데요...

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    •  
      Amath Lv.8 2021.12.22 03:25

      문제 대충 보고 나중에 기억해서 풀었더니 이상해진 것 같아요. 

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    부분해결
    Amath Lv.8 2021.12.22 03:52 비밀댓글

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    •  
      수학동아 Lv.8 2021.12.23 18:13 비밀댓글
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    유지연_매니저 Lv.15 2021.12.22 20:37 비밀댓글
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    유지연_매니저 Lv.15 2022.01.11 02:09 비밀댓글
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      수학동아 Lv.8 2022.01.11 07:37 비밀댓글
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    다시 도전
    Htamction Lv.7 2022.02.20 08:37 비밀댓글
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    •  
      수학동아 Lv.8 2022.02.20 23:34

      ≥가 아닌 >여서 f(x)와 x가 1 차이 나도 안 됩니다.

      좋아요0

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