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[창의 퍼즐] [산수+대수] 특수한 꼴의 곱셈 쉽게 하기
아인수타인 2020.09.01 05:14 조회 549
문제 푼 사람 1명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

(1) 83×87의 값을 계산하시오.

(2) 당연히 (1)번 문제만 냈으면 문제를 낸 의미가 없겠지? 혹시 (1)번 문제를 그냥 일반적인 방법으로 계산했는가? 사실 (1)번 문제는 특수한 경우라서 훨씬 쉽게 계산하는 방법이 있다. 그 방법을 찾아라.

(3) (2)에서 찾은 법칙을 일반화하고 수학적으로 증명하라. 이 때, 일반화할 때는 '~라는 조건이 성립하면 ~의 방법으로 계산 가능하다.' 식으로 쓰면 된다. 이 방법이 가장 쉬울 거라고 확신하지만, 만에 하나 이것보다 더 쉬운 방법을 찾을 수도 있기 때문에 정답확인 기준은 출제자의 방법과 같거나 더 쉬운 방법이면 해결, (2)번과 (3)번 중 하나만 풀거나 기존 방법보단 쉽지만 출제자의 방법보단 어려우면 부분해결을 주겠다.

(계산기로 계산한다는 다시도전 처리합니다! 답으로 인정을 안 하는 게 아니라 실제로 저랑 제 이모랑 이 꼴이 성립하는 곱셈 빨리 계산하기로 대결해봤는데, 이모가 계산기 버튼 다 누르기도 전에 제가 계산 완료했습니다)

 

 

(힌트 비댓으로 달라고 하면 얼마든지 줍니다!)

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  •  
    아인수타인 Lv.12 2020.09.01 05:53

    처음부터 힌트 보는 건 그냥 양심에 맡기겠습니다. 힌트 안 보고 푸는 게 훨씬 성취감이 크다는 건 기억해주시고요!

    (힌트를 안 쓰고 그냥 저대로 놔두면 좀 애매?하다고 해야 하나 암튼 좀 그런 거 같아서요)

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  •  
    해결
    오레오맛 아이스크림 Lv.7 2020.09.01 06:01 비밀댓글
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    •  
      아인수타인 Lv.12 2020.09.01 06:04

      정답 맞고요, 오레오님 말대로 힌트 비댓으로 달라고 하면 준다고 하는 게 더 나을 거 같네요. 수정하겠습니다!

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  •  
    부분해결
    유클리드 Lv.6 2020.09.01 09:55 비밀댓글

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    •  
      아인수타인 Lv.12 2020.09.01 10:47

      부분해결! 정답은 이거보다 더 쉽습니다!

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