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\documentclass{article} \usepackage{geometry} \geometry{hmargin=1cm,vmargin=1cm} \usepackage{tikz} %%% \begin{comment} \end{comment} \def\width{18} \def\hauteur{13}\begin{document}\begin{tikzpicture}[x=1cm, y=1cm, semitransparent] \draw[step=10mm, line width=0.2mm, black!60!white] (0,0) grid (\width 阅读全文
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What if you are involved in an automobile accident in the USWith increasing Chinese tourists and visitors who have driving licenses to the US it is only a matter of time before they will be involved in an automobile accident. Being a visitor to the US, you are at a disadvantage in several ways. I a. 阅读全文
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Paul Simon --Duncan (London,January 1972)Couple in the next roomBound to win a prizeTheyve been goin at it all night longWell Im tryin to get some sleepBut these motel walls are cheapLincoln duncan is my nameAnd heres my song, heres my songMy father was a fishermanMy mama was a fishermans friendAnd 阅读全文
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MathJax TeX Test PageWhen $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$MathJax TeX Test PageWhen $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$View Code MathJax TeX 阅读全文
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1.把 $f(x)=\cos px$ 在 $[-\pi,\pi]$ 上展开为 Fourier 级数.\[\cos px=\frac{\sin p\pi}{\pi}(\frac{1}{p}+\sum_{n=1}^{\infty}(-1)^n\frac{2p}{p^2-n^2}\cos nx).\]取 $x=0$, 则有\[\frac{\pi}{\sin p\pi}=\frac{1}{p}+\sum_{n=1}^{\infty}\frac{(-1)^n2p}{p^2-n^2}.\]2.计算积分 $\int_0^{+\infty}\frac{x^{p-1}}{1+x}\mathrm{d}x$ ($0 阅读全文
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1.人们一般每 8 分钟会收到 1 次打扰，每小时大约 7 次，或者说每天 50-60 次。平均每次打扰大约是 5 分钟，总共每天大约 4 小时，也就是约 50%。80%（约 3 小时）的打扰是没有意义或者极少有价值的。2.每天自学 1 小时，7 小时一周，365 小时一年，一个人可以像全日制学生一样学习。3-5 年就可以成为专家。3.一个人如果工作桌上乱七八糟，他平均每天会为找东西或者多余耗费花 1 个半小时，每周 7 个半小时。4.每周 5 天，每天花 5 分钟改进自己的工作，在 5 年里将导致同一个工作被改进 1200 余次。5.做一件事情实际花费的时间往往会比预期的时间要多一倍。6.& 阅读全文
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可积函数未必具有原函数例如 Riemann 函数\[R(x)= \left\{ \begin{array}{rl} 1, & x=0, \\ 1/p, & x=p/q,(q>0,(p,q)=1), \\ 0 ,& x\text{为无理数}. \end{array} \right.\]若 $R(x)$ 有原函数 $F(x)$ ,即 $F'(x)=R(x) \quad(a\leqslant x\leqslant b).$根据 Darboux 定理，$R(x)$ 在 $[a,b]$ 应具有介值性，但从 $R(x)$ 定义可知它不具有介值性，故 $R(x)$ 没有 阅读全文
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I want a wife who will take care of my physical needs.I want a wife who will keep my house clean. A wife who will pick up after my children, a wife who will pick up after me. I want a wife who will keep my clothes clean, ironed, mended, replaced when need be, and who will see to it that my personal 阅读全文