化解下列式子：a分之a+1+1分之a+1 非常急的

你写错了吧
根据三角形和差化积公式：sinθ-sinφ=2cos[(θ+φ)/2]sin[(θ-φ)/2]
sin(1+h)-sin1
= 2sin[(1+h)-1]/2·cos[(1+h)+1]/2
= 2sin h/2 ·cos(2+h)/2

是对的一看就知道

=(a+3)(a-3)/(a+3)²×a(a+3)/(a-3)-(a-a²)/(a-1)
=a+a(a-1)/(a-1)
=2a

(2x^2+x)-[4x^2-(3x^2-x)]
=2x^2+x-(x^2+x)
=x^2

I am all good detective Mr.Mao Li.A lot of case history in my hands one by one to resolve,for example,why the Titanic sank,I know; for example,why John F.Kennedy was assassinated,I know.But not enough fun,this time I'll look into the case years ago,Snow White was killed on the case.Many people think that it is Snow White,she was killed the letters I do not think so.Let us remind ourselves of the scene at that time.
First of all,we interviewed about the Queen.
Are there people in the world will be jealous of your good looks?We re-interviewed about Snow White.
As we all know is called the motive to kill.Of course,we have the story of seven very important role,and that is the Seven Dwarfs,ask them!
The story takes place in a bright morning,Snow White and the Seven Dwarfs in the park happy to take a walk.Queen's coming.
Stop-stop!Please note that the Apple,which is the world's most poisonous apple,is better than any poison,but the case was whether or not the case.After careful investigation,we are very fortunate that Apple has found that of future generations.Change the time,the gene mutation that future generations of Apple's become very tall,please Apple.
And the apple of our generations have had a lengthy exchange,finally found another suspicious case,it appears that we have to re-examine the history,maybe there will be another face.
It seems we need to re-examine the case and a bright morning,in the end what happened?It was a moment of history forever fixed,the letters was a vicious stepmother,killed his daughter,we were pushed down the cliff.This is another interpretation of history.
We are also the cause of death of the snow survey conducted by mobile users send text messages to 10,086,Unicom users to send text messages to 12,345,678,we have been following the six causes of death.
First,some quarters have not the water heater,she had to Xilengshuizao,first two,she had frozen to death.
Second,some quarters have water heaters,water Tai Tang,she was a Tangsi.
Third,the snow-trichloro Aihe milk,with the passage of time,a failure.
Fourth,do the exercise over and over again,the Fan Si Fan Si of the Fan Si,she was the Fan Si.
Fifth,heard about the story you a passive attitude,so perhaps she was dead.
When I looked at the bodies on the floor,I suddenly thought of the sixth cause of death,because her bedroom as long positions,the exhausted

父爱似海,你用结实的臂膀呵护着我心中的幼苗；你用坚定的目光为我照亮前行的方向；你用严厉的话语敲响我生命的警钟.
写得不好,请多多包含,看看能不能作为答案

需要!正确
a:b=4:2=2:1

你是指化简吗?一般要进行分母有理化
分子分母同时乘上根号2
根号1/2=根号2/2
回答完毕.

(3 -√5) / (√5 -1) = [(3 - √5) * (√5+1)] / [(√5 - 1) * (√5 +1)] = [3√5 +3 - 5 - √5) / [(√5)^2 - 1^2] = (2√5 - 2) / (5 - 1) = (2√5 - 2) / 4 = (√5 - 1) / 2

令我难忘的一件事
人生经历的事情很多很多,有喜有悲,有笑有泪,人生真可谓是多姿多彩.当然,我也不例外.在我的生活中,有一件事使我记忆犹新.
记得那是一个烈日炎炎的夏季,天气非常热,连云朵都发出一种异样的光.那天我正在家里看家,屋子里非常闷,我的心情也随天气而变,我心想：“这天太热了,如果我将屋子收拾一下,不仅屋里可以焕然一新,而且我的心情也会豁然开朗.”想罢,我打来一盆清水,开始收拾起屋子来.当我正在兴头上时,一不留神将妈妈的心爱之物——花瓶碰到了地上,摔得粉身碎骨.这花瓶的碎声犹如晴天霹雳扎进我的脑海里,使我一时神色慌张,不知所措,我想：“如果妈妈知道我把她的心爱之物打碎,骂我?甚至是……”我再也不敢往下想了.正在我心急如焚的时候,让人难以预料的是妈妈竟然从门外走了进来.她看见花瓶碎了,立刻剑眉倒竖,大吓一声：“谁把它打碎的?”当时我是多么想把此事从头到尾告诉妈妈,可是我不敢,真应了那句话——心有余而力不足.我便吱吱唔唔的说：“是隔壁5岁的弟弟弄碎的.”妈妈一听是不懂事的孩子,就再也没追究下去.可是我却从妈妈的眼神中看出她很不高兴,于是,我处处躲避她,当然收拾屋子的兴趣也抛到九霄云外去了.
到了晚上,风波已经平息,我无精打采的来到院子里,我仿佛感觉月亮不像往常那样皎洁,微风不像往常那样温柔,花草不像往常那样可爱,它们好象都在指责我,指责我知错不改的行为,我心中惭愧不已.我便垂头丧气地走到屋里,想了好久,最终决定把这件事向妈妈坦白.我低着头走到妈妈面前,用低低的声音承认了自己的错误,我想妈妈一定会斥责我,可令我万万没想到的是妈妈竟然和颜悦色的对我说了一番话：“孩子,只要你能大胆的承认错误,这比成千上万个花瓶还要珍贵啊……”
妈妈的话深深的印在了我的心里,使我一生受用.
哈,终于好了!累死我了,写得不错吧,呼呼~分我不要了,您老慢用吧~
………………格格格

原式=x²/(x-1)×x(x-1)/(x-1)²
=x³
当 x=2时
原式=2³=8

x^3+3x^2y+3xy^2+y^3

(a+b)^2-2a(b+1)-a^2
=a^2+b^2+2ab-a^2-2ab-2a
=b^2-2a
=2^2-2*(-1/2)
=4+1
=5

6=3x+m 1)
6=(m-3)/x 2)
两方程相减没啥意义,只消去了一个常数.
可用代入消元法,消去一个变量：
由1）：m=6-3x,
代入2）：6=（6-3x-3)/x,去分母就化为一元一次方程了.
6x=3-3x
x=1/3
m=6-3x=5

y=10/x^3 *(7x^3+14/x)=70(1+2/x^4)
y'=70*2*(-5)/x^5=-700/x^5

1/2*10(log3 9)=5*2=10
log3 9----3^x=9---x=2
SO log3 9=2

没有偏题哦!只要是中心围绕着成长的烦恼就没有偏题,如果你结尾点明中心或点题就更好了!

1.2x 3x²-1
—— - ———=1（方程）
x²-1 x
去分母,得2x^2-(x^2-1)(3x^2-1)=x(x^2-1）,
2x^2-(3x^4-4x^2+1)=x^3-x,
3x^4+x^3-6x^2-x+1=0,
2.（x²-x）²-4（2x²-2x-3）=0
（x^2-x)^2-8(x^2-x)+12=0,
∴x^2-x-2=0,或x^2-x-6=0,
∴x1=-1,x2=2,x3=-2,x4=3.
3.（x²+3x+4）（x²+3x+5）=6
(x^2+3x)^2+9(x^2+3x)+14=0,
∴x^2+3x+2=0,或x^2+3x+7=0(无实根）,
∴x1=-1,x2=-2.
20
4.x²+3x - ——-=8
x²+3x
(x^2+3x)^2-8(x^2+3x)-20=0,
x^2+3x+2=0,或x^2+3x-10=0,
∴x1=-2,x2=-1,x3=-5,x4=2.
5.3x+14=4y+6z ｛7y+24=2z+8x 求x,y,z
5z-1=2x+3y
化为一般形式.
3x-4y-6z=-14,①
8x-7y+2z=24,②
2x+3y-5z=-1.③
先消去z,①+②*3,27x-25y=58.④
②*5+④*2,44x-29y=118.⑤
解得x=4,y=2.
代入②,z=3.
6.化解求值
（x²-xy+y²）²（x²+xy+y²）²（x-y)²（x+y）² 其中x=2,y=1
原式=(x^3+y^3)^2*(x^3-y^3)^2
=(x^6-y^6)^2,
当x=2,y=1时原式=63^2=3969.
7.5x²y²+xy-7（分解因式）
=5[xy-(-1+√141）/10][xy-(-1-√141)/10].（求根法）
8.（x-1）（x+4）-｛（x+2）（x-5）-[（x+3）（x-4）-（x-1）（x+6）]｝
=(x-1）（x+4）-｛（x+2）（x-5)-[x^2-x-12-(x^2+5x-6)]}
=(x-1）（x+4）-{x^2-3x-10-[-6x-6]}
=x^2+3x-4-{x^2+3x-4}
=0.

两个窗户 一个玻璃镜子的橱柜 应该还有一个房间门 真是四面楚歌啊.试试把背阳的那个窗户用深色窗帘覆盖 床掉过头 对着窗户 用一个窗户采光；

2(1-3x)>3x+20
2-6x>3x+20
2-20>6x+3x
9x

ln(1+x²)-ln(1+sin²x)
=ln[(1+x²)/(1+sin²x)]
=ln[(1+sin²x+x²-sin²x)/(1+sin²x)]
=ln[(1+sin²x)/(1+sin²x)+(x²-sin²x)/(1+sin²x)]
=ln[1+(x²-sin²x)/(1+sin²x)]

可以这样回答,首先这个就不是是或者否的问题,因为你的观点是错误的,就不能和是和非有什么关系.（总之就是分散注意,引到两方的论题上来,或者引到和论题相关的其它问题,随后再慢慢反驳）

第4行 加 -26 倍的第3行
r4 - 26r3
最后一行变为
0 0 0 9

（x-a）^2+y^2=a^2

就是切割化弦,然后利用二倍角公式
1/4cot(pai/4-x/2)sec^2(pai/4-x/2)
=(1/4)cos(pai/4-x/2)/sin(pai/4-x/2) *1/[cos(pai/4-x/2)]^2
=(1/4)/[sin(pai/4-x/2)cos(pai/4-x/2)]
=(1/2)/[2sin(pai/4-x/2)cos(pai/4-x/2)]
=(1/2)/sin(pai/2-x)

2a-1>0且3a-9

但凡算命不分命格身旺身弱的,则喜忌不分,如神煞一类的,不可尽信.
此造四柱 戊午 甲子 丙寅 壬辰
本造官星秉令透壬杀,子辰半会化杀,天干戊食通根於日支余气,而甲卩通根於寅木,但寅午半会而不准化,力量已弱,综合而论,此命中和偏弱,以年支午火为用,喜火木和水,忌土金.

1又5/9＞5/8(30/48)＞7/12(28/48)＞3/16(9/48)
1又23/36＞1又7/12(21/36)
5/6（40/48）＞0.75（36/48）＞2/3(32/48)＞7/12(28/48=77/132)＞6/11(72/132)＞3/8(6/16)＞0.125（1/8）

友谊是一次奇妙的实验,能证明万变不离其中的现象

化解分数时,可以把(分数线)理解成除法运算,然后在进行除法运算

它的上一步：
∫(1,e)f(x)dx= ∫(1,e)(lnx-Axdx),展开得到：
∫(1,e)f(x)dx= ∫(1,e)lnxdx- A∫(1,e)xdx
对应积分得到：
A=（xlnx-x)(1,e)-Ax^2/2(1,e)
代入x的上下限取值得到：
A=1-[A(e^2-1)/2]
所以：
A=2/(1+e^2)
进一步：
f(x)=lnx-Ax,将A代入得到：
f(x)=lnx-2x/(1+e^2)

陨石按照来源分有两种,
一种有来至彗星,这种是流星的主要来源,比数量多了就成了流星雨,比如狮子座流星雨,双子座流星雨他们出现时间有规律,一般密度小,在大气层容易破碎,即使体积大也不会到达地面.传说中的通古斯大爆炸,就是一个体积庞大的彗星残害,在距地面几公里的地方爆炸的,使得数平方万公里的树木辐射性折倒.
还有一种来至火星和木星之间的小星星带,它们由于受星体引力干扰偏离轨道,只有很小部分可能飞向地球,它们形成的流星叫偶发流星如果体积大的对地球造成的破坏就是灾难性的,恐龙灭绝可能和他有关.
这样的陨石究竟多大能够到达地球呢?
影响因素：1 陨石密度,2 形状（有的形状容易分解碎裂）, 3速度 （虽然速度差距不是很大,但是有一定影响）4落在地球的纬度, 因为地球大气对陨石摩擦主要是对流层,而对流层高度由赤道向两极递减.
我没有更深入的计算过质量和摩擦质量损失的关系,所以只能回答这么多,也许有时间的时候我会查资料详细计算,最近刚把行星运动研究明白,baidu 太深奥的问题找不到答案,因为科学家正在研究呢,就说这么多吧,究竟多大质量我也不知道,呵呵

1 Russian writer Chikov said that one person who does not know how to be humorous and appreciate humor will have no hope.
2 humor can defuse the embarrassing scenes
3 humor can complete some things which couldn't have been completed.
4 humor can enhance the love of life
5 humor can help one get along better with others

(1)原式=1- x-1分之x 当x=2分之1时 原式=2
（2）3y平方z分之5
（3）0

2x（x的平方+1）-x(2x的平方+2x-3)
=2x³+2x-2x³-2x²+3x
=5x-2x² 其中x=2
=5*2-2*2²
=10-8
=2

How to Reduce Stress-如何减少压力
How to Reduce Stress(如何减少压力) 1.现代社会人们的压力与日俱增; 2.压力太大的危害; 3.减少压力的办法.[写作导航]首先陈述随着现代生活节奏的加快,人们的压力也在增大,虽然适当的压力对人有好处,但压力太大就会产生副作用,从而影响工作、学习和健康,所以要学会减轻压力;第二段阐述减轻压力的办法,比如降低对自己的要求、接受现实、不要攀比,多与朋友沟通等;最后总结全文,提出希望.[范文]
As the pace of modern life continues to quicken,many people are in the habit of rushing through life.Some admit that stress seems to be on the increase all the time.A certain degree of stress is beneficial to us,but too much stress is certainly harmful,and sometinles may even harmful to our health and physique.So it is necessary to know how to reduce stress.
There are many ways that can help us solve this problem,but the following may be the most effective.First,learn to COllie to terms with yourselves.Don't set a goal that is too high because there are many things in this world that are beyond your reach.Learn to be content to go as far as you can.Second,learn to COllie to terms with the world around you.Don't try to change other people or other 　things.There are people and things in this world that you can do nothing about.So learn to accept them.Third,don't be too interested in material things and don't try to "keep up with the Joneses." Don't harbor any jealousy,vanity or resentment to others.Be satisfied with what you have.Finally,keep in touch with your friends.Talk with them,share with them your happiness and misery.This will help to make you feel better.
These are not necessarily the only ways to solve the problem,and it is my hope that everyone can reduce the too much stress in his work and study and live a relaxed happy life.

³√(b²/a)*³√a÷√a³b
=³√b²÷√a²b
=b⅔÷a²b
=a^(﹣²)b^(﹣⅓)
=a的负2次方b的负3分之1次方

（4x²-4x+1）+（y²-6y+9）=0
（2x-1）²+（y-3）²=0
x=1/2,y=3

用的是配方法,配的是一次项系数一半的平方,具体的是：2t^2-t+2=2(t^2-1/2t)+2=2(t^2-1/2t+1/16-1/16)+2=2[(t-1/4)^2-1/16]+2=2(t-1/4)^2-1/8+2=2(t-1/4)^2+15/8公式是：ax^2+bx+c=a(x+b/2a)^2+(4ac-b^2)/4a...

用上引号,意义就不同了.这是我的看法.《同学间的“爱”与“恨”》追问：
如果是站在一位中学生的角度去写这篇文章的话,我会根据某件事例,然后婉转地引用曹植的七步诗中的最后两句话-------本是同根生,相煎何太急.追问：
作文题目是需要根据文章的内容来决定的.譬如：我打算围绕“宽容”的话题或者是“冲突”的话题····《在冲突中成长》-------《有一种情感叫宽容》；如果文章中写的事例比较严重的话,譬如校园案例,那么也可以直接以《相煎何太急》为题,展开议论.但愿能帮到你.感觉你,现在要写什么内容都还未定下来,这种状态下,去一味地考虑作文题目是徒劳的,浪费时间而已.

一般可以通过行列式性质提出一个λ的一次因式
但这个不好想, 只能化化简, 撞大运
r1-(1/2)(λ-1)r2 - r3
0 -(1/2)(λ-1)(λ-2) -2(λ-2)
2 λ-2 2
0 2 λ-3
第1行可提出(λ-2)
余下的你应该会了

把c的平方分解因数然后化简.例如根号下二十,分解后为根号下4×5=2根号下5.还有应该背过1-20的数的平方,和一些常用的整数勾股数组.

（x^2+xy）/x=x^2/x+xy/x=x+y

原式=[(a+2)/a(a-2)-(a-1)/(a-2)²][a(a-2)/(4-a)]
=[(a²-4-a²+1)/a(a-2)²][a(a-2)/(4-a)]
=-3/[(a-2)(4-a)]
=-3/(1*1)
=-3

四分之一,
二分之一分之一等于四分之三,一减四分之三等于四分之一.

(a²-ab)分之(a²-b²)除以（a+（分开的）a分之2ab+b²）
=(a-b)(a+b)/a(a-b)÷[(a²+2ab+b²)/a]
=(a+b)/a×[a/(a+b)²]
=1/(a+b) a=2,b= - 3
=1/(2-3)
=-1

（2-a)/(a-2)²=（2-a)/(2-a)²=1/(2-a）
（1-A)²/(1-A)=1-A