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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
성장
2021.02.08 19:03
조회 385
수를 세어봅시다. 예를 들어 19는 십구라고 읽고 327은 삼백이십칠 이라고 읽겠죠?
이렇게 수를 셀때, f(n)은 1부터 n까지 수를 센 개수입니다 예를 들어 f(5)=5이고, f(30)=59 입니다.
그렇다면
1)f(1000000)은 몇일까요?
2)f(10n)의 일반적인 값이 존재할까요? 존재한다면 그 식을 써 주시고, 없다면 그 이유를 써 주세요.
3)f(n)의 일반적인 값이 존재할까요? 존재한다면 그 식을 써 주시고, 없다면 그 이유를 써 주세요
단, 19009는 일만 구천구가 아니라 만 구천구로, 156473345은 억 오천육백사십칠만 삼천삼백사십오가 아니라 일억 오천육백사십칠만 삼천삼백사십오로 읽습니다.
지금 바로
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