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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
여름
2021.07.15 01:49
조회 666
난이도 89.101112131415
단순이는 폴 초등학교의 수학 선생님이다. 어느날 단순이는 아이들에게 단위분수 공부를 시켜주기 위해
1/2부터 1/2021까지 칠판에 쭉 썼다.(참고로 이 칠판은 매우 길다!)
그런데 갑자기 교실에 신이 들어왔다.
신은 이 칠판의 숫자를 내가 원하는 대로 바꿀 수 있다고 말한다.
[규칙]
임의의 두 수 a, b에 대하여 a와 b를 지우는 대신 그 자리에 ab+a+b를 써 넣는다.(이런 식으로 계속 한다는 뜻)
신은 작업을 시작했다.
한 평생이 지난 후, 신이 이 행위를(2020번) 마쳤을 때 칠판에는 단 한 개의 수만이 남아있었다.
이 수는 무엇일까?(풀이 필수)
-
jane
Lv.8
2021.07.15 08:20
-
여름
Lv.5
2021.07.15 08:29
좋아요0
-
미니언벨로
Lv.3
2021.07.15 08:24
비밀댓글
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-
JM
Lv.6
2021.07.15 18:01
비밀댓글
확인요청중
비밀 댓글이 등록 되었습니다.
-
김미래_기자
Lv.15
2021.07.23 01:29
비밀댓글
확인요청중
비밀 댓글이 등록 되었습니다.
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