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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
지금부터 숫자마술을 시작하겠습니다.
2에서 9까지의 숫자중 1개를 골라주세요.
그 숫자에 9를 곱해주세요.
나온 두자릿수의 자리수 합을 구해주세요.
그렇게 해서 나온 결과에 2를 곱하고 13을 빼주세요.
자, 지금부턴 어려워집니다.
그 결과를 1은 a, 2는 b, 3은 c, 4는 d, 5는 e....
이런식으로 영어로 바꿔주세요.
해당하는 알파벳으로 시작하는 동물을 하나 골라주세요.
자, 이제 그 동물을 영어로 했을때 마지막글자를 맞춰보겠습니다.
e 또는 t가 맞나요?
(엄청난 환호와 박수*)
--------------------------------
위의 마술이 성립하는 수학적인 이유는 무엇일까?
※<도전 20제!>는 주제목록에서 임의의 20개 주제를 골라서 문제를 내는 MathlabJ의 프로젝트입니다. 좀 더 신박하고 재밌는 주제로 문제를 내고 싶어서 하게 되었습니다.
※현재 초코파이님의 주제(김치)가 <도전 20제!> 3번 문제로 등록되었습니다!
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RH
Lv.7
2020.04.09 22:31
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△π
Lv.9
2020.04.10 00:39
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