<html> <p>偶尔去思考一下,避免自己迟钝下去。和我一起参加 @kenchung 的数学题,体会下思考的乐趣。希望大家多多支持 @kenchung 的数学X编程比赛,下一期即将开始。</p> <blockquote> 传送门:<a href="https://steemit.com/contest/@kenchung/question-mathematics-programming-competition-6">[Question] Mathematics × Programming Competition #6 [問題] 數學 × 程式編寫比賽 (第六回)</a></blockquote> <p><center><img src="https://steemitimages.com/DQmd5zSshfrWZDq88czhcXhSTqfB3T4At4S1MSv5zRASbR1/1%E5%89%AF%E6%9C%AC.jpg" width="400" height="200"/></center></p> <p> 题目:已知 <em>x</em> 為平方數,而 <em>p</em> 為質數,且符合公式 <em>x</em> = 1000000007<em>p</em> + 1。求 <em>p</em> 所有可能值之和。 </p> <p>乍一看被这个大数字吓到了,肯定会有人想用编程解决,毫无疑问这道题用编程解决是非常的快,那么从数学的角度来解答呢?其实一样很简单。</p> <p><em>x</em> = 1000000007*<em>p</em> + 1 我们可以看作 x^2=1000000007*<em>p</em> + 1;</p> <p>那么进行简单的变换下;</p> <p> x^2-1=1000000007*<em>p 即</em><code><strong>(x+1)*(x-1)</strong></code><em>=</em>1000000007*<em>p</em></p> <p>到这儿我们可以看出来 一个 1000000007*<em>p</em>是相隔2 的两个数相乘的结果。</p> <p>1000000007*<em>p 的因数为:p、1、1000000007</em></p> <p>那么显而易见,p 要么是1000000009 要么是1000000005 ,或者0 ,因为p是质数,那么就只能是1000000009了</p> <p>根据条件进行简单的构造,问题就迎刃而解了。</p> <p><code><strong>初中学习的x^2-1=(x+1)(x-1)还是挺好用的吗?有忘记吗?</strong></code></p> <blockquote>除了数学比赛,还有 @armandocat 的 Coding challenge,传送门: <a href="https://steemit.com/contest/@armandocat/coding-challenge-2-win-sbd-if-you-solve-the-problem">Coding challenge #2 - Win SBD if you solve the problem!</a></blockquote> <h2>Recent Posts</h2> <ul> <li> <a href="https://steemit.com/cn/@jubi/or-7">兴之所致,趣在其中 | 谷哥点名#7</a></li> <li><a href="https://steemit.com/cn/@jubi/781yxp">自己忽略的图片版权问题</a></li> <li><a href="https://steemit.com/cn/@jubi/5wmwgs">天黑请闭眼,杀手是你吗?烧脑推理电影2部走起!</a></li> <li><a href="https://steemit.com/cn/@jubi/4npd1m">死亡实验: 因为我们是狱警,你们是囚犯!</a></li> <li><a href="https://steemit.com/cn/@jubi/jjjjjjjjjjjjjjjjjjjjjjjj">说说STEEMIT自定义文章URL</a></li> <li><a href="https://steemit.com/cn/@jubi/and-crossword-puzzle-for-steemit">对于填字游戏的小小想法 & Crossword Puzzle For Steemit</a></li> <li><a href="https://steemit.com/cn/@jubi/plan-b">得给自己准备一个Plan B</a></li> <li><a href="https://steemit.com/cn/@jubi/4pnxy">被人推醒了,N倍梦还继续做吗?TO THE MOON!!</a></li> <li><a href="https://steemit.com/cn/@jubi/4zypxn">[难忘至尊宝]那个人样子好怪,好像一条狗</a></li> <li><a href="https://steemit.com/cn/@jubi/anime-character-drawing-challenge">动漫人物画画比赛:路飞和艾斯 /Anime Character Drawing Challenge</a></li> <li><a href="https://steemit.com/cn/@jubi/egpak-kenchung">不会编程,利用猜测\推理解答 @kenchung 的方程式</a></li> <li><a href="https://steemit.com/cn/@jubi/yours-org-and-4">关于YOURS.ORG首页"高收益"的小解释 & 一点想法4</a></li> <li><a href="https://steemit.com/cn/@jubi/or-5">跳不出的死循环《恐怖游轮》 | #5电影</a></li> <li><a href="https://steemit.com/cn/@jubi/yours-org-and-3">关于YOURS.ORG 投票赚钱 & 一点想法 3</a></li> <li><a href="https://steemit.com/cn/@jubi/excel-markdown-convert-excel-to-the-markdown">快速将Excel表格转换为MarkDown表格 /Convert Excel to the MarkDown</a></li> </ul> <blockquote><strong>[AD] </strong> <a href="https://steemit.com/cn/@jubi/and-7"><strong>第六期“谷哥点名”活动结束 & 第七期开始 #7兴趣</strong> </a><strong>主题:兴趣 9月20日截止</strong></blockquote> <blockquote><strong>[AD]</strong> <a href="https://steemit.com/contest/@jubi/2-gmaecontest-find-the-pleasure-in-the-game-2">#2 GameContest : Find the pleasure in the game/#2 游戏竞赛:挖掘游戏的乐趣</a></blockquote> <p>感谢您阅读 <a href="https://steemit.com/@jubi">@jubi</a> 的帖子 希望得到您的follow、upvote和reply ,对我最重要的是reply,期待和您的每次对话 </p> </html>
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哪有什么编程方法,就是数学方法。编程的总得有个上限,他这个题,乍一看连个上限都没有。。。这题就是数学方法最好哈哈。我也发一个和你的方法略有一点不同哈哈
post_id | 13,047,408 |
---|---|
author | tvb |
permlink | re-jubi-7wnti-kenchung-20170917t095221498z |
category | cn |
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还是比较简单的。:)
post_id | 13,047,607 |
---|---|
author | jubi |
permlink | re-tvb-re-jubi-7wnti-kenchung-20170917t095459716z |
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我是把右边配方了,都一个意思哈哈哈。编程就确认一下那个1000什么7是质数能用上,其他我感觉也用不上。看看他的正确答案是怎么做的哈哈。
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permlink | re-jubi-re-tvb-re-jubi-7wnti-kenchung-20170917t100039773z |
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最后一个等式对吗?怎么看着有点问题?
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---|---|
author | drunkevil |
permlink | re-jubi-7wnti-kenchung-20170917t095332339z |
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x*x-1=(x+1)(x-1) 有什么问题吗
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---|---|
author | jubi |
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文中好像左边没有减1。
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太烧脑了 我不懂
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---|---|
author | hannahwu |
permlink | re-jubi-7wnti-kenchung-20170917t101500133z |
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created | 2017-09-17 10:15:03 |
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我去。这题我做错了, 我答案是0, 数学学不好。哎。
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author | justyy |
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太好了,我瞬间感觉我的春天来了。
post_id | 13,055,716 |
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原本还以为是一道编程题 结果居然可以靠初中知识解读,被数字吓到了
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是呢,表象。
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雖然數學不差,可是現在看到數學題都直接跳過,我是不是真的太懶惰了?
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就像我看到英语 大脑会告诉我赶紧打开百度翻译。哈哈
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咱俩一样呀,我发现咱俩有很多相似之处,问一下你胖吗?
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我也是推介這個方法的~ 比較快捷 但是怎麼好像沒有看到你提交的答案? ...
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你这个题出简单 了,应该把1000000007改成合数。这样首先需要计算出1000000007的质因数,再计算所有的可能的约数,再去循环来做各个约数可能存在约数=1000000007/约数XP+2或-2。这样就是程序题了。现在基本就数学题。
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你這提議不錯的,當時想不到啦 haha
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Unfortunately I don't speak Chinese. I've posted my solution here for who's interested 😼 https://steemit.com/contest/@armandocat/my-solution-to-mathematics-programming-competition-6
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