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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">
<meta name="generator" content="Hexo 5.4.0">
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png">
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<link rel="mask-icon" href="/images/logo.svg" color="#222">
<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="/lib/font-awesome/css/all.min.css">
<link rel="stylesheet" href="/lib/pace/pace-theme-material.min.css">
<script src="/lib/pace/pace.min.js"></script>
<script id="hexo-configurations">
var NexT = window.NexT || {};
var CONFIG = {"hostname":"dashu-li.github.io","root":"/","scheme":"Gemini","version":"7.8.0","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12,"onmobile":false},"copycode":{"enable":false,"show_result":false,"style":null},"back2top":{"enable":true,"sidebar":false,"scrollpercent":false},"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":false,"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"algolia":{"hits":{"per_page":10},"labels":{"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}},"localsearch":{"enable":true,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},"path":"search.xml"};
</script>
<meta name="description" content="长风破浪会有时，直挂云帆济沧海">
<meta property="og:type" content="website">
<meta property="og:title" content="李大恕 的博客">
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<meta property="og:locale" content="zh_CN">
<meta property="article:author" content="李大恕">
<meta name="twitter:card" content="summary">
<link rel="canonical" href="https://dashu-li.github.io/">
<script id="page-configurations">
// https://hexo.io/docs/variables.html
CONFIG.page = {
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<title>李大恕 的博客</title>
<noscript>
<style>
.use-motion .brand,
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.use-motion .logo-line-before i { left: initial; }
.use-motion .logo-line-after i { right: initial; }
</style>
</noscript>
</head>
<body itemscope itemtype="http://schema.org/WebPage">
<div class="container use-motion">
<div class="headband"></div>
<header class="header" itemscope itemtype="http://schema.org/WPHeader">
<div class="header-inner"><div class="site-brand-container">
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<div class="toggle" aria-label="切换导航栏">
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<a href="/" class="brand" rel="start">
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<h1 class="site-title">李大恕 的博客</h1>
<span class="logo-line-after"><i></i></span>
</a>
<p class="site-subtitle" itemprop="description">OI蒟蒻的水坑</p>
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<a href="/" rel="section"><i class="fa fa-home fa-fw"></i>首页</a>
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<a href="/about/" rel="section"><i class="fa fa-user fa-fw"></i>关于</a>
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</a>
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<input autocomplete="off" autocapitalize="off"
placeholder="搜索..." spellcheck="false"
type="search" class="search-input">
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="https://dashu-li.github.io/2021/12/05/%E5%88%9A%E4%BD%93%E5%8A%9B%E5%AD%A6%E7%AC%94%E8%AE%B0/">
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<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2021/12/05/%E5%88%9A%E4%BD%93%E5%8A%9B%E5%AD%A6%E7%AC%94%E8%AE%B0/" class="post-title-link" itemprop="url">刚体力学笔记</a>
</h2>
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<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2021-12-05 23:49:08" itemprop="dateCreated datePublished" datetime="2021-12-05T23:49:08+08:00">2021-12-05</time>
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<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2021-12-06 00:31:07" itemprop="dateModified" datetime="2021-12-06T00:31:07+08:00">2021-12-06</time>
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<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E7%89%A9%E7%90%86/" itemprop="url" rel="index"><span itemprop="name">物理</span></a>
</span>
，
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E7%89%A9%E7%90%86/%E5%8A%9B%E5%AD%A6/" itemprop="url" rel="index"><span itemprop="name">力学</span></a>
</span>
，
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E7%89%A9%E7%90%86/%E5%8A%9B%E5%AD%A6/%E5%88%9A%E4%BD%93/" itemprop="url" rel="index"><span itemprop="name">刚体</span></a>
</span>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<h3 id="转动惯量"><a href="#转动惯量" class="headerlink" title="转动惯量"></a>转动惯量</h3><p>一个刚体的<strong>转动惯量</strong>定义为</p>
<script type="math/tex; mode=display">
I=\sum_im_i{r_i}^2</script>
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="https://dashu-li.github.io/2021/10/19/%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%AD%E6%8F%8F%E8%BF%B0%E8%BE%B9%E5%85%B3%E7%B3%BB%E7%9A%84%E5%AE%9A%E7%90%86%E5%8F%8A%E5%85%B6%E8%AF%81%E6%98%8E/">
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<meta itemprop="name" content="李大恕 的博客">
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<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2021/10/19/%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%AD%E6%8F%8F%E8%BF%B0%E8%BE%B9%E5%85%B3%E7%B3%BB%E7%9A%84%E5%AE%9A%E7%90%86%E5%8F%8A%E5%85%B6%E8%AF%81%E6%98%8E/" class="post-title-link" itemprop="url">三角形中描述边关系的定理及其证明</a>
</h2>
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<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2021-10-19 20:12:45" itemprop="dateCreated datePublished" datetime="2021-10-19T20:12:45+08:00">2021-10-19</time>
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<i class="far fa-calendar-check"></i>
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<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2021-12-26 21:45:35" itemprop="dateModified" datetime="2021-12-26T21:45:35+08:00">2021-12-26</time>
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<a href="/categories/%E6%95%B0%E5%AD%A6/" itemprop="url" rel="index"><span itemprop="name">数学</span></a>
</span>
，
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E6%95%B0%E5%AD%A6/%E5%87%A0%E4%BD%95/" itemprop="url" rel="index"><span itemprop="name">几何</span></a>
</span>
，
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/%E6%95%B0%E5%AD%A6/%E5%87%A0%E4%BD%95/%E4%B8%89%E8%A7%92%E5%BD%A2/" itemprop="url" rel="index"><span itemprop="name">三角形</span></a>
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</header>
<div class="post-body" itemprop="articleBody">
<p>注：本篇中所指的“边”是<strong>一切和三角形有关的边</strong>，包括但不限于中线、角平分线、梅氏线等。</p>
<h3 id="Menelaus定理"><a href="#Menelaus定理" class="headerlink" title="Menelaus定理"></a>Menelaus定理</h3>
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<p><a target="_blank" rel="noopener" href="https://www.luogu.com.cn/problem/P2308">P2308 添加括号</a></p>
<h3 id="题面"><a href="#题面" class="headerlink" title="题面"></a>题面</h3><h4 id="题目背景"><a href="#题目背景" class="headerlink" title="题目背景"></a>题目背景</h4>
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<p><a target="_blank" rel="noopener" href="https://www.luogu.com.cn/problem/P1352">P1352 没有上司的舞会</a></p>
<p>本蒟蒻的第一篇题解~</p>
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