• 191118


    191118

    日记

    1. 今天喝了一个亲戚的小孩子的满月酒,对“喝酒”一点兴趣都没有,还是喜欢一个人看看书、玩玩鱼、打打游戏、看看直播、睡睡觉,当然,这段时间的打游戏和看直播是被禁止了。我怎么就变成宅男了,宅男一枚,尴尬,哈哈20:00
    2. 眼睛很酸,所以练字和专业课学习计划都取消了,想着早点弄完这个,然后早点休息,但是在回顾知识点的时候,眼睛一点都不酸。现在刚结束回顾,酸死了,眼睛都有点疼了,被网瘾废掉的眼睛也不知道什么时候能好一点,以前挖下的坑,以后都需要慢慢补上。睡觉了,晚安。21:29
    3. 虽然没有人提醒我做这个,但是内心还是有一种压迫感的,担心有人来找我要钱。下午本来就是因为一些事可以找个理由搪塞过去的,但是想到晚上要总结回顾,担心这个逼装不好,强行还是学了点东西,不至于写个无字。21:34
    4. 今天学习的英语的特殊结构是非常简单的,但是中学就是学不会,就很好的印证了《如何高效记忆》中说的一句话,最好的记忆方法就是(稍有改造):用心并刻意的去学习、去记忆,而不是我接下来说的一些花里胡哨的方法。用心并刻意能让你有90%,其他的方法可以让你在90%的基础上提升;如果你不用心,也许只有10%,其他方法有2倍作用,也是白搭。21:36

    单词

    http://xima.tv/o7aIcx

    回顾

    数学

    6.1节 元素法

    1.经典积分思想回顾

    [egin{aligned} & 1.\,a = x_0<x_1<ldots<x_n = b; \ & *{[a,b]}=[x_0,x_1]igcup[x_1,x_2]igcupldotsigcup[x_{n-1},x_n]; \ & Delta{x_i}=x_i-x_{i-1}\,(1leq{i}leq{n} \ \ & 2.\,foralldelta_iin[x_{i-1},x_i];\ & Delta{s_i}approx{f(x_i)}Delta_{x_i}; \ & Sapproxsum_{i=1}^n{f(x_i)}Delta_{x_i} \ \ &3.\,lambda=max{Delta_{x_1},Delta_{x_2},cdots,Delta_{x_n}};\ &S = lim_{lambda=0}sum_{i=1}^nf(delta_i)Delta_{x_i}=int_a^bf(x)dx & end{aligned} ]

    2.元素法思想

    [egin{aligned} &1.\,取[x,x+dx]subset[a,b]; \ &2.\,dA=f(x)dx;\ &3.\,A=int_a^bdA=int_a^bf(x)dx end{aligned} ]

    6.2节 几何应用

    一、面积

    1.单条函数面积

    [egin{aligned} &1.\,取[x,x+dx]subset[a,b]; \ &2.\,dA=f(x)dx;\ &3.\,A=int_a^bdA=int_a^bf(x)dx end{aligned} ]

    2.多条函数重合面积

    [egin{aligned} &1.\,取[x,x+dx]subset[a,b]; \ &2.\,dA=[f(x)-g(x)]dx;quad ext{注:f(x)$geq$g(x)}\ &3.\,A=int_a^bdA=int_a^b[f(x)-g(x)]dx end{aligned} ]

    3.极坐标下求面积

    [egin{aligned} & L:\,r=r( heta);\ &1.\,取[ heta, heta+d heta]subset[alpha,eta]; \ &2.\,dA=frac{1}{2}r^2( heta)d heta;quad ext{扇形面积}\ &3.\,A=int_alpha^eta{dA}=int_alpha^eta[frac{1}{2}r^2( heta)]dx end{aligned} ]

    二、体积

    1.旋转函数时的体积-绕x轴

    [egin{aligned} &1.\,取[x,x+dx]subset[a,b]; \ &2.\,dV_x=pi{y^2}dx=pi{f^2(x)}dx;quad ext{圆柱体}\ &3.\,V_x=piint_a^bf^2(x)dx end{aligned} ]

    2.旋转函数时的体积-绕y轴

    [egin{aligned} &1.\,取[x,x+dx]subset[a,b]; \ &2.\,dV_y=2pi{|x||f(x)|}dx; quad ext{看成A4纸的体积}\ &3.\,V_y=2piint_a^b|x||f(x)|dx end{aligned} ]

    3.截口面积已知几何体体积

    [egin{aligned} &截口面积函数为A(x)\ &1.\,取[x,x+dx]subset[a,b]; \ &2.\,dV=A(x)dx;quad ext{看成圆柱体}\ &3.\,V=int_a^bA(x)dx end{aligned} ]

    4.弧长

    [egin{aligned} &1.\,取[x,x+dx]subset[a,b]; \ &2.ds=sqrt{(dx)^2+(dy)^2}=sqrt{1+f'^2(x)}dx;\ &3.l=int_a^bsqrt{1+f'^2(x)}dx end{aligned} ]

    5.参数方程下求弧长(求体积同理)

    [L:egin{cases} x=phi(t)\ y=psi(t) end{cases} quad(alphaleq{t}leqeta) ]

    [egin{aligned} &1.\,取[t,t+dt]subset[alpha,eta]; \ &2.ds=sqrt{(dx)^2+(dy)^2}=sqrt{(frac{dx}{dt})^2+({frac{dy}{dt}})^2}dt=sqrt{phi^2(t)+psi^2(t)}dt;\ &3.l=int_a^bsqrt{phi^2(t)+psi^2(t)}dt end{aligned} ]

    英语

    7.1节 强调句型

    It is ... that ... ,强调句型只需要把强调的部分放入is ... that中间,其余部分不动,需要注意的是强调句型只有两个谓语动词is和was,并且强调句型的框架中的单词毫无意义。

    I met my old flame in the yesterday. / It was I that met my old flame in the yesterday.

    Because of you, I failed to pass the examination. / It was because of you that I failed to pass the examination.

    作文中的任何一句话都可以写成强调句,除了谓语动词之外其余的成分都可以强调。

    7.2节 倒装

    1. 把一句话写成一般疑问句的形式就是倒装,也就是说把一句话的助动词放在句首就是倒装。
      1. Do you love me?
      2. Have you been to Japan.
    2. 否定词用在句首就是倒装,否定词如下有:never、seldom、little、few、scarcely、rarely、by no means
      1. I will never love you. / Never will I love you.
      2. Under no circumstances, we can keep a blind eye on the significance of teamwork. / Under no circumstances, can we keep a blind eye on the significance of teamwork.
    3. So、nor/neither放在句首,表示承前的肯定和倒装
      1. I can speak Japanese. / So can I speak Japanese.
      2. I can't speak Japanese. / Nor/Neither can I speak Japanese.
    4. So...that...的倒装,so引导的部分放在句首用倒装。出现形容词和副词都可以使用so...that...,也就是说可以使用倒装
      1. My mother keeps so kind that she never kill an ant. / So kind does my mother keep that she never kill an ant.
    5. Only后跟状语倒装
      1. I love you deeply. / Only deeply do I love you.
      2. The phenomenon can be handled by the action above. / Only by the action above can the phenomenon be handled.
    6. 虚拟语气的倒装:省略if的虚拟语气用倒装
      1. If every youngster were addicted to surfing on the internet, they would achieve nothing until the end of their life. / Were every youngster addicted to surfing on the internet, they would achieve nothing until the end of their life.
    7. As引导的让步状语从句,从句的表语可以放在句首构成部分倒装
      1. As she looks elegant, she is actually a thief. / Elegant as she looks, she is actually a thief.

    专业课

    健身

    休息日

    书法

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  • 原文地址:https://www.cnblogs.com/nickchen121/p/11885594.html
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