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Function: driver
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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
자신을 수학천재라 칭하는 한 사람이 있었다.
이 사람은 정수의 계산만 할 수 있는데, 계산식에 포함된 모든 숫자들의 개수만큼 시간이 걸린다.
또한 괄호는 먼저 계산한뒤 그 계산값의 자리수로 식의 계산 시간이 결정된다고 한다.
그리고 식에 × 또는 ÷ 가 있다면 1개당 계산시간이 두배가 된다고 한다.
예를들어 2+3 은 2와 3 모두 한자리 수 이므로 계산하는데 2초가 걸린다.
또한 9-(10÷5) 는 10÷5 먼저 계산하는데, 이것을 계산하는데 3×2=6초가 걸리고 9-2 를 계산하는데 2초가 걸려서 총 8초가 걸린다.
그렇다면 이 사람이 1+(2×3)-(4×5)+(6×7)-(8×9)+10 을 계산하는데는 얼마나 걸릴까?
그리고 20초 안에 계산하는 사람을 천재로 인정한다고 할때, 이 사람은 수학천재인가?
풀이과정과 답을 구해보자.
-
전자기역학
Lv.8
2020.05.29 07:53
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리퍼
Lv.6
2020.05.29 09:00
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