Enviar pesquisa
Carregar
整数問題 各桁の和
•
Transferir como DOCX, PDF
•
0 gostou
•
1,263 visualizações
S
saiaki
Seguir
「正の整数nであって,nの各桁の和の300倍がnに等しいようなものを全て求めよ」 数学オリンピックにいかにも出てきそうな問題です.
Leia menos
Leia mais
Ciências
Denunciar
Compartilhar
Denunciar
Compartilhar
1 de 3
Baixar agora
Recomendados
「時計の世界の整数論」第2回プログラマのための数学勉強会 #maths4pg
「時計の世界の整数論」第2回プログラマのための数学勉強会 #maths4pg
Junpei Tsuji
素数大富豪に関する自由研究まとめ
素数大富豪に関する自由研究まとめ
Ni sei
素数大富豪徹底攻略! 〜戦略分析編〜
素数大富豪徹底攻略! 〜戦略分析編〜
Ni sei
素数大富豪
素数大富豪
Shinichiro Seki
高校数学 幾何学の問題 やや難
高校数学 幾何学の問題 やや難
saiaki
階差数列の和?について 数学B 数列
階差数列の和?について 数学B 数列
saiaki
楽しい数式その4 ~奇数の和と平方数~
楽しい数式その4 ~奇数の和と平方数~
saiaki
楽しい数式その1 ~1と9の不思議~
楽しい数式その1 ~1と9の不思議~
saiaki
Recomendados
「時計の世界の整数論」第2回プログラマのための数学勉強会 #maths4pg
「時計の世界の整数論」第2回プログラマのための数学勉強会 #maths4pg
Junpei Tsuji
素数大富豪に関する自由研究まとめ
素数大富豪に関する自由研究まとめ
Ni sei
素数大富豪徹底攻略! 〜戦略分析編〜
素数大富豪徹底攻略! 〜戦略分析編〜
Ni sei
素数大富豪
素数大富豪
Shinichiro Seki
高校数学 幾何学の問題 やや難
高校数学 幾何学の問題 やや難
saiaki
階差数列の和?について 数学B 数列
階差数列の和?について 数学B 数列
saiaki
楽しい数式その4 ~奇数の和と平方数~
楽しい数式その4 ~奇数の和と平方数~
saiaki
楽しい数式その1 ~1と9の不思議~
楽しい数式その1 ~1と9の不思議~
saiaki
2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot
Marius Sescu
Everything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPT
Expeed Software
Product Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage Engineerings
Pixeldarts
How Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental Health
ThinkNow
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
marketingartwork
Skeleton Culture Code
Skeleton Culture Code
Skeleton Technologies
PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024
Neil Kimberley
Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)
contently
How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024
Albert Qian
Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
Kurio // The Social Media Age(ncy)
Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024
Search Engine Journal
5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary
SpeakerHub
ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd
Clark Boyd
Getting into the tech field. what next
Getting into the tech field. what next
Tessa Mero
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Lily Ray
How to have difficult conversations
How to have difficult conversations
Rajiv Jayarajah, MAppComm, ACC
Introduction to Data Science
Introduction to Data Science
Christy Abraham Joy
Time Management & Productivity - Best Practices
Time Management & Productivity - Best Practices
Vit Horky
The six step guide to practical project management
The six step guide to practical project management
MindGenius
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
RachelPearson36
Mais conteúdo relacionado
Destaque
2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot
Marius Sescu
Everything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPT
Expeed Software
Product Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage Engineerings
Pixeldarts
How Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental Health
ThinkNow
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
marketingartwork
Skeleton Culture Code
Skeleton Culture Code
Skeleton Technologies
PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024
Neil Kimberley
Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)
contently
How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024
Albert Qian
Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
Kurio // The Social Media Age(ncy)
Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024
Search Engine Journal
5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary
SpeakerHub
ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd
Clark Boyd
Getting into the tech field. what next
Getting into the tech field. what next
Tessa Mero
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Lily Ray
How to have difficult conversations
How to have difficult conversations
Rajiv Jayarajah, MAppComm, ACC
Introduction to Data Science
Introduction to Data Science
Christy Abraham Joy
Time Management & Productivity - Best Practices
Time Management & Productivity - Best Practices
Vit Horky
The six step guide to practical project management
The six step guide to practical project management
MindGenius
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
RachelPearson36
Destaque
(20)
2024 State of Marketing Report – by Hubspot
2024 State of Marketing Report – by Hubspot
Everything You Need To Know About ChatGPT
Everything You Need To Know About ChatGPT
Product Design Trends in 2024 | Teenage Engineerings
Product Design Trends in 2024 | Teenage Engineerings
How Race, Age and Gender Shape Attitudes Towards Mental Health
How Race, Age and Gender Shape Attitudes Towards Mental Health
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
AI Trends in Creative Operations 2024 by Artwork Flow.pdf
Skeleton Culture Code
Skeleton Culture Code
PEPSICO Presentation to CAGNY Conference Feb 2024
PEPSICO Presentation to CAGNY Conference Feb 2024
Content Methodology: A Best Practices Report (Webinar)
Content Methodology: A Best Practices Report (Webinar)
How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024
Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024
5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary
ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd
Getting into the tech field. what next
Getting into the tech field. what next
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search Intent
How to have difficult conversations
How to have difficult conversations
Introduction to Data Science
Introduction to Data Science
Time Management & Productivity - Best Practices
Time Management & Productivity - Best Practices
The six step guide to practical project management
The six step guide to practical project management
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
整数問題 各桁の和
1.
「正の整数n であって,n の各桁の和の300
倍がn に等しいようなものを全て求めよ」 (2012 年イタリア数学オリンピック) (次ページ以降にsaiaki が書いた解答)
2.
【解答例】 푛 の各桁の和を
푆 とすると, 푛 = 300푆 が成り立 つ. 푘 = 3푆 とおくと,푛 = 100푘 が成り立つ.よって,푘 の各桁の和は 푆 である. 푘 は 푒 桁の数であるとする.すると, 10푒−1 ≤ 푘 が成り立つ.また,푘 は 푒 桁なので, 푆 ≤ 9푒 である.よって, 10e−1 ≤ 푘 = 3푆 ≤ 27푒 ∴ 푒 ≤ 2 (푒 ≥ 3に対して 10푒−1 > 27푒 であることは数学的 帰納法で示せる.) よって 푘 = 10푎 + 푏 (ただし,0 ≤ 푎, 푏 ≤ 9) と書ける.푘 = 3푆 と 푆 = 푎 + 푏 より, 7푎 = 2푏
3.
したがって,푎 = 2,
푏 = 7 を得る. ゆえに 푘 = 27 であり, 푛 = 2700 である. ∎
Baixar agora