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Function: mkdir

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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Function: getLatexImg

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Function: parseLatexImg

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
Line: 425
Function: initBoardView

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
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Function: require_once

수학동아 - 폴리매스
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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 이항연산
아인수타인 2020.03.29 23:14 조회 552

이항연산 \Joinx\Join y=xy-x-y+2로 약속한다. 이 때, 5와 1에 대한 역원을 각각 구하여라.

 

(역원이 뭔지 궁금하다면 언제든 질문 달아주세요!)

이 문제 어떠셨나요?

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어려워요

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  •  
    은총알 Lv.11 2020.03.30 01:30

    역원이 무엇인가요?

    그리고 이항연산도 무엇인지 궁금합니다!

    댓글 작성하기 좋아요0 댓글수1
    •  
      K→C≡N Lv.11 2020.03.30 01:34

      이항연산은 무시하면 되고

      역원은 예를 들어 5에 대한 역원은 x에 5를 대입해서 결과가 항등원이 나올려면 대입해야하는 y값을 말하는겁니다

      좋아요0
  •  
    해결
    K→C≡N Lv.11 2020.03.30 01:33 비밀댓글
    비밀 댓글이 등록 되었습니다.
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    •  
      은총알 Lv.11 2020.03.30 01:35

      감사합니다

      좋아요0
  •  
    다시 도전
    로보카폴리 Lv.11 2020.03.30 05:33 비밀댓글
    비밀 댓글이 등록 되었습니다.
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