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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="#FFF"><link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon.png"><link rel="icon" type="image/ico" sizes="32x32" href="/images/favicon.ico"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><link rel="alternate" type="application/rss+xml" title="当时明月在" href="http://kiris-z.github.io/rss.xml"><link rel="alternate" type="application/atom+xml" title="当时明月在" href="http://kiris-z.github.io/atom.xml"><link rel="alternate" type="application/json" title="当时明月在" href="http://kiris-z.github.io/feed.json"><link rel="stylesheet" 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id="header" itemscope itemtype="http://schema.org/WPHeader"><div class="inner"><div id="brand"><div class="pjax"><a href="/" class="logo" rel="start"><p class="artboard">Yoru Meigetsu</p><h1 itemprop="name headline" class="title">当时明月在</h1></a></div></div><nav id="nav"><div class="inner"><div class="toggle"><div class="lines" aria-label="切换导航栏"><span class="line"></span> <span class="line"></span> <span class="line"></span></div></div><ul class="menu"><li class="item title"><a href="/" rel="start">Yoru Meigetsu</a></li></ul><ul class="right"><li class="item theme"><i class="ic i-sun"></i></li><li class="item search"><i class="ic i-search"></i></li></ul></div></nav></div><div id="imgs" class="pjax"><ul><li class="item" data-background-image="https://s2.loli.net/2023/11/06/dUwhWVBxkorbXaP.jpg"></li><li class="item" data-background-image="https://s2.loli.net/2023/11/06/oCDsWc2w9N36X8r.jpg"></li><li class="item" 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class="divider">置顶文章</h2><div class="segments sticky"><article class="item"><div class="cover"><a href="/postgraduate/math/higher%20mathematics/findlimit/" itemprop="url" title="一. 求极限例题"><img data-src="https://s2.loli.net/2023/11/06/1HublkQqgvjZAym.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-04-11 19:38:52"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-04-11T19:38:52+08:00">2023-04-11</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>4.3k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>4 分钟</span></span></div><h3><a href="/postgraduate/math/higher%20mathematics/findlimit/" itemprop="url" title="一. 求极限例题">一. 求极限例题</a></h3><div class="excerpt">极限 limx→+∞(1+1x)x2ex=limx→+∞exex=1\lim_{x\rightarrow +\infty}\frac{(1+\frac{1}{x})^{x^2}}{e^x}=\lim_{x\rightarrow +\infty}\frac{e^x}{e^x}=1limx→+∞ex(1+x1)x2=limx→+∞exex=1。 设 f(x)f(x)f(x) 在 x=ax=ax=a 的某个邻域内有定义,下面哪个选项不能说明 x=a 处可导: limh→+∞h[f(a+1h)−f(a)]\lim_{h\rightarrow...</div><div class="meta footer"><span><a href="/categories/postgraduate/math/higher-mathematics/" itemprop="url" title="高数"><i class="ic i-flag"></i>高数</a></span></div><a href="/postgraduate/math/higher%20mathematics/findlimit/" itemprop="url" title="一. 求极限例题" class="btn">more...</a></div></article></div><h2 class="divider">精选分类</h2><div class="cards"><section class="item"><div class="cover" data-background-image="/bug/cover.jpg"><h2 class="title">bug日常小记</h2></div><div class="info"><div class="ribbon"><a href="/categories/bug/" itemprop="url" title="bug日常小记">bug日常小记</a></div><div class="inner"><ul class="posts"><li><a title="1.Windows下vscode调试C++代码,STL只显示地址不显示数据" href="/bug/vscode-STL-bug/">1.Windows下vscode调试C++代码,STL只显示地址不显示数据</a></li></ul><div class="meta footer"><span><i class="ic i-file"></i>1 篇文章</span></div><a href="/categories/bug/" itemprop="url" title="bug日常小记" class="btn">more...</a></div></div></section><section class="item"><div class="cover" data-background-image="/postgraduate/math/cover.jpg"><h2 class="title">数学</h2><span>考研</span></div><div class="info"><div class="ribbon"><a href="/categories/postgraduate/math/" itemprop="url" title="数学">数学</a></div><div class="inner"><ul class="posts"><li><a title="概率论" href="/categories/postgraduate/math/probability-theory/">概率论</a></li><li><a title="线代" href="/categories/postgraduate/math/linear-algebra/">线代</a></li><li><a title="高数" href="/categories/postgraduate/math/higher-mathematics/">高数</a></li></ul><div class="meta footer"><span><a href="/categories/postgraduate/" itemprop="url" title="考研"><i class="ic i-flag"></i>考研</a> </span><span><i class="ic i-file"></i>3 个子项,13 篇文章</span></div><a href="/categories/postgraduate/math/" itemprop="url" title="数学" class="btn">more...</a></div></div></section><section class="item"><div class="cover" data-background-image="/computer-science/java/course-1/cover.jpg"><h2 class="title">零基础学Java语言-浙江大学-翁恺</h2><span>计算机科学</span></div><div class="info"><div class="ribbon"><a href="/categories/computer-science/java/course-1/" itemprop="url" title="零基础学Java语言-浙江大学-翁恺">零基础学Java语言-浙江大学-翁恺</a></div><div class="inner"><ul class="posts"><li><a title="第1周 计算" href="/computer-science/java/course-1/week-1/">第1周 计算</a></li><li><a title="第2周 判断" href="/computer-science/java/course-1/week-2/">第2周 判断</a></li></ul><div class="meta footer"><span><a href="/categories/computer-science/" itemprop="url" title="计算机科学"><i class="ic i-flag"></i>计算机科学</a> </span><span><i class="ic i-file"></i>2 篇文章</span></div><a href="/categories/computer-science/java/course-1/" itemprop="url" title="零基础学Java语言-浙江大学-翁恺" class="btn">more...</a></div></div></section></div><h2 class="divider">文章列表</h2><div class="segments posts"><article class="item"><div class="cover"><span class="exturl" data-url="aHR0cHM6Ly93d3cuY25ibG9ncy5jb20vTW91bnQyNTYvcC8xNjc3ODk3Ni5odG1sIyVFNyU5NCU5RiVFNCVCQSVBNyVFOCU4MCU4NSVFNiVCNiU4OCVFOCVCNCVCOSVFOCU4MCU4NSVFOSU5NyVBRSVFOSVBMiU5OCVFNyU5QSU4NCVFNCVCOCU4NyVFOCU4MyVCRCVFNiU5NiVCOSVFNiVCMyU5NSVFNiVBRCVBNSVFOSVBQSVBNA==" itemprop="url" title="一. 经典同步与互斥问题"><img data-src="https://s2.loli.net/2023/11/06/wE1qDl8BTgh2UpV.jpg"></span></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-11-15 22:07:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-11-15T22:07:00+08:00">2023-11-15</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>23</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><span class="exturl" data-url="aHR0cHM6Ly93d3cuY25ibG9ncy5jb20vTW91bnQyNTYvcC8xNjc3ODk3Ni5odG1sIyVFNyU5NCU5RiVFNCVCQSVBNyVFOCU4MCU4NSVFNiVCNiU4OCVFOCVCNCVCOSVFOCU4MCU4NSVFOSU5NyVBRSVFOSVBMiU5OCVFNyU5QSU4NCVFNCVCOCU4NyVFOCU4MyVCRCVFNiU5NiVCOSVFNiVCMyU5NSVFNiVBRCVBNSVFOSVBQSVBNA==" itemprop="url" title="一. 经典同步与互斥问题">一. 经典同步与互斥问题<i class="ic i-link-alt"></i></span></h3><div class="excerpt">【操作系统 - 进程】PV 操作 —— 生产者消费者问题</div><div class="meta footer"><span><a href="/categories/postgraduate/os/" itemprop="url" title="操作系统"><i class="ic i-flag"></i>操作系统</a></span></div><span class="exturl btn" data-url="aHR0cHM6Ly93d3cuY25ibG9ncy5jb20vTW91bnQyNTYvcC8xNjc3ODk3Ni5odG1sIyVFNyU5NCU5RiVFNCVCQSVBNyVFOCU4MCU4NSVFNiVCNiU4OCVFOCVCNCVCOSVFOCU4MCU4NSVFOSU5NyVBRSVFOSVBMiU5OCVFNyU5QSU4NCVFNCVCOCU4NyVFOCU4MyVCRCVFNiU5NiVCOSVFNiVCMyU5NSVFNiVBRCVBNSVFOSVBQSVBNA==" itemprop="url" title="一. 经典同步与互斥问题">more...</span></div></article><article class="item"><div class="cover"><a href="/postgraduate/math/higher%20mathematics/Multivariate%20differentiation/" itemprop="url" title="九. 多元微分"><img data-src="https://s2.loli.net/2023/11/06/H1tDuUjLPoXqWBV.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-11-14 16:05:06"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-11-14T16:05:06+08:00">2023-11-14</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>1.2k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/math/higher%20mathematics/Multivariate%20differentiation/" itemprop="url" title="九. 多元微分">九. 多元微分</a></h3><div class="excerpt"># 多元函数的极限问题 若证明了 y=kx 与 y 轴方向上多元函数的极限均存在且相等,不能证明该点极限存在,因为仅仅证明了沿直线趋近时的极限存在 # 全微分 全微分条件存在 AAA, BBB 使得 Δz=AΔx+BΔy+o((Δx)2+(Δy)2)\Delta z = A\Delta x+B\Delta y+o(\sqrt{(\Delta x)^2+(\Delta y)^2})Δz=AΔx+BΔy+o((Δx)2+(Δy)2) 成立,注意 A,B 的修饰词是存在,也就是说,是现有 A,B,然后再通过计算得出了 A,B...</div><div class="meta footer"><span><a href="/categories/postgraduate/math/higher-mathematics/" itemprop="url" title="高数"><i class="ic i-flag"></i>高数</a></span></div><a href="/postgraduate/math/higher%20mathematics/Multivariate%20differentiation/" itemprop="url" title="九. 多元微分" class="btn">more...</a></div></article><article class="item"><div class="cover"><a href="/%E7%A3%81%E7%9B%98%E6%A0%BC%E5%BC%8F%E5%8C%96/" itemprop="url" title="磁盘格式化"><img data-src="https://s2.loli.net/2023/11/06/cZORVhFq5KWtLaB.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-11-12 23:29:08"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-11-12T23:29:08+08:00">2023-11-12</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>459</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/%E7%A3%81%E7%9B%98%E6%A0%BC%E5%BC%8F%E5%8C%96/" itemprop="url" title="磁盘格式化">磁盘格式化</a></h3><div class="excerpt">为了使用磁盘存储文件,操作系统需要将其数据结构记录在磁盘上。 低级格式化(Low-Level Formatting):也被称为物理格式化,将磁盘分为由一个或多个柱面组成的分区,每个分区可以被看作是一个独立的磁盘。它是硬盘制造商在制造硬盘时进行的一种格式化。低级格式化的过程包括在磁盘的每个磁道上划分扇区。为每个扇区采用特别的数据结构(高级格式化的数据结构),包括校验码。在此过程中,硬盘的每个扇区都会被赋予一个唯一的地址。这个过程通常在硬盘出厂前完成,一般用户无需(也不应)进行低级格式化。 高级格式化(High-Level...</div><a href="/%E7%A3%81%E7%9B%98%E6%A0%BC%E5%BC%8F%E5%8C%96/" itemprop="url" title="磁盘格式化" class="btn">more...</a></div></article><article class="item"><div class="cover"><span class="exturl" data-url="aHR0cHM6Ly93d3cucHJvY2Vzc29uLmNvbS9lbWJlZC82NTQ5ZjMxMWU2NTgxNTA2NDllMWI4NjA=" itemprop="url" title="考研史纲时间轴"><img data-src="https://s2.loli.net/2023/11/06/H1tDuUjLPoXqWBV.jpg"></span></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-11-07 23:31:06"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-11-07T23:31:06+08:00">2023-11-07</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>35</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><span class="exturl" data-url="aHR0cHM6Ly93d3cucHJvY2Vzc29uLmNvbS9lbWJlZC82NTQ5ZjMxMWU2NTgxNTA2NDllMWI4NjA=" itemprop="url" title="考研史纲时间轴">考研史纲时间轴<i class="ic i-link-alt"></i></span></h3><div class="excerpt">考研史纲时间轴 ( &lt;iframe&gt; 标签渲染有问题,改成外链)</div><span class="exturl btn" data-url="aHR0cHM6Ly93d3cucHJvY2Vzc29uLmNvbS9lbWJlZC82NTQ5ZjMxMWU2NTgxNTA2NDllMWI4NjA=" itemprop="url" title="考研史纲时间轴">more...</span></div></article><article class="item"><div class="cover"><a href="/postgraduate/computer%20organization/%E5%AD%98%E5%82%A8%E7%B3%BB%E7%BB%9F/" itemprop="url" title="二. 存储系统"><img data-src="https://s2.loli.net/2023/11/06/BRhxWAlPOZf9EXJ.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-07-31 22:07:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-07-31T22:07:00+08:00">2023-07-31</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>1.2k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/computer%20organization/%E5%AD%98%E5%82%A8%E7%B3%BB%E7%BB%9F/" itemprop="url" title="二. 存储系统">二. 存储系统</a></h3><div class="excerpt">#...</div><div class="meta footer"><span><a href="/categories/postgraduate/computer-organization/" itemprop="url" title="计算机组成原理"><i class="ic i-flag"></i>计算机组成原理</a></span></div><a href="/postgraduate/computer%20organization/%E5%AD%98%E5%82%A8%E7%B3%BB%E7%BB%9F/" itemprop="url" title="二. 存储系统" class="btn">more...</a></div></article><article class="item"><div class="cover"><a href="/postgraduate/computer%20organization/%E6%95%B0%E6%8D%AE%E7%9A%84%E8%A1%A8%E7%A4%BA%E5%92%8C%E8%BF%90%E7%AE%97/" itemprop="url" title="一. 数据的表示和运算"><img data-src="https://s2.loli.net/2023/11/06/51Z2bavEtBqfGUw.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-07-31 22:07:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-07-31T22:07:00+08:00">2023-07-31</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>1.1k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/computer%20organization/%E6%95%B0%E6%8D%AE%E7%9A%84%E8%A1%A8%E7%A4%BA%E5%92%8C%E8%BF%90%E7%AE%97/" itemprop="url" title="一. 数据的表示和运算">一. 数据的表示和运算</a></h3><div class="excerpt"># 概念 408 中,整数补码,移码符号位相反,数值位相同 双符号位的最高符号位代表真正的符号,而低位符号位用于参与移位操作以判断是否发生溢出 C 语言的数据在内存中为补码表示形式 补码减法或是无符号数减法时,需计算减数负数的补码,通过一个反向器和控制端 Sub 实现取反,同时将低位进位置一来实现 + 1 操作 # 补码双符号位规格化 当 10.XXX或01.XXX10.XXX或01.XXX10.XXX或01.XXX 需要右规一次 当 00.0XXX或11.1XXX00.0XXX或11.1XXX00.0XXX或11.1XXX 需要左规一次或多次 当...</div><div class="meta footer"><span><a href="/categories/postgraduate/computer-organization/" itemprop="url" title="计算机组成原理"><i class="ic i-flag"></i>计算机组成原理</a></span></div><a href="/postgraduate/computer%20organization/%E6%95%B0%E6%8D%AE%E7%9A%84%E8%A1%A8%E7%A4%BA%E5%92%8C%E8%BF%90%E7%AE%97/" itemprop="url" title="一. 数据的表示和运算" class="btn">more...</a></div></article><article class="item"><div class="cover"><a href="/postgraduate/math/higher%20mathematics/Integral%20calculus%20of%20multivariate%20functions/" itemprop="url" title="八. 多元函数积分学"><img data-src="https://s2.loli.net/2023/11/06/6uK4d2FY8fTr3aW.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-07-25 21:36:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-07-25T21:36:00+08:00">2023-07-25</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>204</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/math/higher%20mathematics/Integral%20calculus%20of%20multivariate%20functions/" itemprop="url" title="八. 多元函数积分学">八. 多元函数积分学</a></h3><div class="excerpt"># 平面 一般式 点法式 三点式 截距式 平面束方程 # 直线 一般式 点向式 参数式 两点式 # 位置关系 点到平面距离 点到直线距离(二维,三维) # 空间曲线的切线方向向量 参数方程曲线 方程组曲线 # 空间曲面切平面法线方向向量 隐式方程曲面 F(x,y,z)=0F(x,y,z)=0F(x,y,z)=0。 显式函数曲面 z=f(x,y)z = f(x,y)z=f(x,y)。 # 空间曲线在坐标面投影求法 # 旋转曲面求法 # 方向导数 定义 计算公式 # 梯度 # 散度 # 旋度</div><div class="meta footer"><span><a href="/categories/postgraduate/math/higher-mathematics/" itemprop="url" title="高数"><i class="ic i-flag"></i>高数</a></span></div><a href="/postgraduate/math/higher%20mathematics/Integral%20calculus%20of%20multivariate%20functions/" itemprop="url" title="八. 多元函数积分学" class="btn">more...</a></div></article><article class="item"><div class="cover"><a href="/postgraduate/math/higher%20mathematics/derivative/" itemprop="url" title="七. 导数"><img data-src="https://s2.loli.net/2023/11/06/gwQuqeNJliLhD6m.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-07-24 23:14:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-07-24T23:14:00+08:00">2023-07-24</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>1.5k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/math/higher%20mathematics/derivative/" itemprop="url" title="七. 导数">七. 导数</a></h3><div class="excerpt"># 隐函数存在定理 # 隐函数存在定理 1 设函数 F(x,y)F(x,y)F(x,y) 在点 P(x0,y0)P(x_0,y_0)P(x0,y0) 的某一邻域内具有连续偏导数,且 F(x0,y0)=0,Fy′(x0,y0)≠0F(x_0,y_0)=0,F_y&#x27;(x_0,y_0)\neq 0F(x0,y0)=0,Fy′(x0,y0)=0 ,则在点 P0P_0P0 的邻域内能确定一个连续且具有连续导数的函数 y=f(x)y=f(x)y=f(x),且有...</div><div class="meta footer"><span><a href="/categories/postgraduate/math/higher-mathematics/" itemprop="url" title="高数"><i class="ic i-flag"></i>高数</a></span></div><a href="/postgraduate/math/higher%20mathematics/derivative/" itemprop="url" title="七. 导数" class="btn">more...</a></div></article><article class="item"><div class="cover"><a href="/postgraduate/data%20structure/Threaded%20binary%20tree/" itemprop="url" title="一. 二叉树"><img data-src="https://s2.loli.net/2023/11/06/brpd48vfjSDECNZ.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-07-22 10:34:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-07-22T10:34:00+08:00">2023-07-22</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>1.2k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/data%20structure/Threaded%20binary%20tree/" itemprop="url" title="一. 二叉树">一. 二叉树</a></h3><div class="excerpt"># 题型 # 已知先序序列求不同二叉树个数 先序序列为 a0a1a2⋯ana_0a_1a_2\cdots a_na0a1a2⋯an ,长度为 n+1n+1n+1 的先序序列不同二叉树个数为 cn+1c_{n+1}cn+1。 已知先序序列和中序序列可以唯一确定一个二叉树,考虑中序序列。 中序序列类似于 b0⋯bk−1a0bk⋯bn−1b_0\cdots b_{k-1} a_0 b_{k} \cdots b_{n-1}b0⋯bk−1a0bk⋯bn−1。 b0⋯bk−1b_0\cdots b_{k-1}b0⋯bk−1 为左子树的节点 同时 a1⋯aka_1\cdots...</div><div class="meta footer"><span><a href="/categories/postgraduate/data-structure/" itemprop="url" title="数据结构"><i class="ic i-flag"></i>数据结构</a></span></div><a href="/postgraduate/data%20structure/Threaded%20binary%20tree/" itemprop="url" title="一. 二叉树" class="btn">more...</a></div></article><article class="item"><div class="cover"><a href="/postgraduate/math/higher%20mathematics/attention/" itemprop="url" title="六. 注意点"><img data-src="https://s2.loli.net/2023/11/06/rLdsz3TthHNgQWE.jpg"></a></div><div class="info"><div class="meta"><span class="item" title="创建时间:2023-07-07 14:37:00"><span class="icon"><i class="ic i-calendar"></i> </span><time itemprop="dateCreated datePublished" datetime="2023-07-07T14:37:00+08:00">2023-07-07</time> </span><span class="item" title="本文字数"><span class="icon"><i class="ic i-pen"></i> </span><span>1.4k</span> <span class="text">字</span> </span><span class="item" title="阅读时长"><span class="icon"><i class="ic i-clock"></i> </span><span>1 分钟</span></span></div><h3><a href="/postgraduate/math/higher%20mathematics/attention/" itemprop="url" title="六. 注意点">六. 注意点</a></h3><div class="excerpt"># 区间条件与定点邻域的区分 设 f(x)={x24+x4sin1x,x≠0,0,x=0f(x)=\begin{cases}\frac{x^2}{4}+x^4\sin\frac{1}{x},x\neq0,\\0,x=0\end{cases}f(x)={4x2+x4sinx1,x=0,0,x=0, 则。 f′′(0)&gt;0f&#x27;&#x27;(0)&gt;0f′′(0)&gt;0 且 f(x)f(x)f(x) 在 x=0x=0x=0...</div><div class="meta footer"><span><a href="/categories/postgraduate/math/higher-mathematics/" itemprop="url" title="高数"><i class="ic i-flag"></i>高数</a></span></div><a href="/postgraduate/math/higher%20mathematics/attention/" itemprop="url" title="六. 注意点" class="btn">more...</a></div></article></div></div><nav class="pagination"><div class="inner"><span class="page-number current">1</span><a class="page-number" href="/page/2/">2</a><a class="page-number" href="/page/3/">3</a><a class="extend next" rel="next" href="/page/2/"><i class="ic i-angle-right" aria-label="下一页"></i></a></div></nav></div><div id="sidebar"><div class="inner"><div class="panels"><div class="inner"><div class="contents panel pjax" 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