1加到100答案是什么

如果是加速运动的话是靠自身喷出气体产生推力,不是加速运动的话就是靠惯性运动,并且不会永远走下去,太空中也不是绝对的真空,也是有阻力的,而且星球的引力也会影响速度.

1、从句子结构上来看,一连有好几个动作：“听”“低头”“看”“打开”,这样的作用在于能详细地反映出罗威一系列连贯的动作,清楚地表现出动作的起因、经过和结果.
2、这样表达,能生动地体现出李台阳既能严肃地批评别人,又能在恢谐中让受批评的人不生气,从而体现出一种非凡地说话技巧.

运用数列知识 17205

是离子浓度的大小比较吧
[NA+]等于[0H-]大于[H+]
[Na+]=[OH-]=0.2mol/L,[H+]=5乘10的-14次方mol/L

发射机上的发射天线

寒樱暖暖为你
此题要用技巧：
（1+100）×100÷2
=5050
（或在客户端右上角评价点【满意】）
是我前进的动力!你的采纳也会给你带去财富值的.
如有不明白,
直到完成弄懂此题!

这是等差数列
因为后一项与前一项的差相同
高斯公式：首项加末项乘以项数除以2
1 + 2 +3+……+100
100+99+98+……+ 1
上下相加
每一项是101
一共100项
是两个数列的和
再除以2
（1+100）×100÷2=5050

电阻,电容都是为电流提供回路

5050*66.5=335825

正整数数列求和公式：Sn=(1+an)*n/2=(1+n）*n/2.(1) 【提示1为首项为1时,an=n】
1/[(1+n）*n]=1/n-1/(1+n).(2) 【提示等式右边通分即可得到左边】
由题意 原式=1/S1+1/S2+1/S3+.+1/S100.(3)
（1）代入（3） 原式=2/(1*2)+2/(2*3)+2/(3*4)+.+2/(100*101).(4)
（2）代入（4） 原式=2*(1-1/2+1/2-1/3+1/3-1/4+...+1/100-1/101)
=2*（1-1/101)
=200/101

用数学归纳法.
S1=1^3=1^2
S2=1^3+2^3=9=3^2=(1+2)^2
S3=1^3+2^3+3^3=36=6^2=(1+2+3)^2
S4=1^3+2^3+3^3+4^3=100=10^2=(1+2+3+4)^2
S5=1^3+2^3+3^3+4^3+5^3=15^2=(1+2+3+4+5)^2
假设当n=k时,有Sk=1^3+2^3+...+k^3=(1+2+...+k)^2
则当n=(k+1)时,
S(k+1)=Sk+ak=(1+2+...+k)^2+(k+1)^3
=[k(k+1)/2]^2+(k+1)^3
=(k+1)^2[k^2/4+k+1]
=(k+1)^2[(k^2+4k+4)/4]
=(k+1)^2(k+2)^2/4
=[(k+1)(k+2)/2]^2
=(1+2+...+k+1)^2
同样成立.
综上,得
1^3+2^3+...+n^3=[n(n+1)/2]^2
所以当n=100时,就有
Sk=1^3+2^3+...+100^3=[100*(100+1)/2]^2=5050^2=25502500

511/512
数学归纳法

＜1+100＞×100÷2＝5050

配置银氨溶液时为什么要先加硝酸银后加氨水是为了要做到“氢氧化银沉淀恰好完全溶解”
浓氨水难以控制
过量就有按氨水杂质了呀
不可以先加氨水后加硝酸银,因为难以控制.

1+2+3+4+5+6+7+8+9+10.+100
=(1+99)=(2+98).(49+51)+50
=100+100+100.+50
=5050
2：1+2+3+4+5+6+7+8+9…… +100
=（1+100）+（2+99）+（3+98）+……+（54+57）+（55+56）
=101×50
=5050
望采纳

100! = 9.3326215443944 * 10 157
10的157次方

涓嬮潰鏄?叏閮ㄧ殑缈昏瘧.璇风瑧绾?
Where can I encountered seven Aberdeen (full text)
(A)
In the process of growth,we will encounter a lot of things,if it is happy not to Deyiwangxing,or getting too much; if it is painful,do not complain,because it will be the others will never be able to take the post of your wealth.
Is that your wealth - there are always older predecessors instill this concept to me.
I was smiling by Dian Zhuotou land,but in his heart whispered to Ma Zhao,"You have to feel so good,I left all the wealth of hello."
In any case,not of wealth.
(B)
Impression can recall,there are so few things that I always remind myself that we must forget,as nothing happened,my life had not been made,said the impact of.
They have been directly or indirectly,changed my track to grow.
(C)
On one occasion.In the approach of test results at the upper and middle reaches of the table after I asked math questions,teachers did not know where to jump up,angrily said:"Wang Moumou a good review,Do not waste valuable time on him."
59 students in his class,59 pairs of eyes stare back together.I will never forget that moment for all,Fangruo nailed me,the sadness,pity,ridicule and something more to say,watch the eyes ....
The humiliation did not play a lot of stories inside of the scenes are bound to happen - the main character has been in a lot of humiliation after the beginning of the high level,the extraordinary final play,cum laude admitted to a well-known schools,the snow was to shame ......
I do not have such a great talent.At the time,I,weary,partial Branch,sensitive and low self-esteem.In addition to Yin Ren at the time of tears,pretend nothing happened,cried a home run,draw any change in their status and fate of the move.
After I began to give up on themselves,then naturally the focus has not admitted to any school.I have to admit that Wang Moumou was indeed a waste of time.I can not say any words of rebuttal.Only to see the "teacher" words will be frowned,smiled and far-fetched.
(D)
There are many such things.For example,when Gao witnessed his best friend was mistaken diagnosis and treatment of a doctor to die; the holidays to find their first job,but that's Pianqian ......
There's.
Perhaps there will be no more.
I also may be forgotten.
These injuries have been deeply in the India head,engraved in mind.With the inter-year-old goes on,like a washed up by many times the clothes were constantly depreciation,increasing yellowing.
(E)
On the very back teeth bite?Strong enough to solve all?It was given a powerful force,it has a strong spiritual support - not the fact.
Just because it can not go back.
(F)
Character often say the fate of the decision.I think this is probably true,at least on the fate of the play can change a lot of impact,right?
If I was able to work hard,perhaps on the Hong Kong Certificate of Education a good school,right?
Had never experienced the death of a friend,I would not be suffering from neurasthenia,right?
Had the company not to be Pian Qian,I may often exercise their own labor,right?
............
濡傛灉.濡傛灉.濡傛灉.濡傛灉.
So,"if" - will not be a Chinese dictionary,you were one of the most frequently used word this?Because carrying too much hope,and never regret,the frequency of use by more than repeated.
But ...
If,after all.
(G)
"On the 7th of the Yangtze",the nagging Xingye over to the small Di said:Although we are poor,but can not lie,can not be beat; is not our thing,we can not hold; to study hard,to be brought up on Useful to the community.Di small that no father to rescue them,old and broken lying on the bed with his arms crying,thinking up these ideas are:If not encountered seven small Di-earners,it will be like now?If we went back to a similar Xingye,or seven-earners,no matter what is the best teacher is also the Friends of the guy,we make the following allegiance to the cloth,then perhaps all will be different,right?
Not to enlarge the pain of youth.Do not look for trouble.
Non-inferiority.No impulse.Fuqi not.
Others do not because of their own to stimulate change.
Do not always look forward to other people "understanding" of their own.Maybe some people will understand,but you may not be really concerned.
Others say,praise or abuse worth,heard passed,no room for complacency,no need for a more tears.
In the absence of verification in person before,do not believe anyone would say.Including your teachers,your parents,but also your classmates and friends.
Some people call you,your friends to call you if you are convey to the - this person is not a true friend.
Regardless of what parents say and do anything,to believe that they will not harm you.If so,they must be the way a problem.
Finally,please take good care of yourself.
(H)
Today - I still do not believe that wealth is gone.
However,I believe,so every time a different choice,we must stand ready to suffer as a result of the choices arising from the cost and pain.
For the young to pay the price.More ignorance and impulse pay the price.
You imprison the youth and superior,after all,to use an adult's hard to make up and go.

5050

90

1+99=100,2+98=100...49+51=100,一共有50个100,再加上50,等于5050 1+2+3+4+5+6+7+8+9+...98+99+100 =100+(1+99)+(2+98).(49+51)+50 =100×50+50 =5050 或:1+2+3+4+5+6+7+8+9+...98+99+100 =(1+100)x100/2 =5050

1/50+2/50+……+49/50+1
=(1+2+……+49)/50+1
=[49*(1+49)/2]/50+1
=(49*50/2)/50+1
=49*25/50+1
=49/2+1
=24.5+1
=25.5

我以前好象做过,是不是405度

在任何情况下,使用环境温度不得超过４５℃,很危险的.要用加热器不得超过４５℃啊.你可能是气瓶不好了,为安全计,建议换瓶.

for+时间段 ,since+时间点 ,by+将来的时间 ,lately；recently,just,up to now,till now,so far,these days,in the past few years／months／weeks／days ,yesterday；last week；in 1945,at that time；once；during the war；before；a few days ago；when,used to+动词原形,be／become／get used to+动名词doing,before,after,by,up till ,will do.will be doing,have been doing
一、 一般现在时：
1.概念：经常、反复发生的动作或行为及现在的某种状况.
2.时间状语：always,usually,often,sometimes,every week (day,year,month…),once a week,on Sundays,
3.基本结构：动词 原形 （如主语为第三人称单数,动词上要加（e）S）
4.否定形式：am/is/are+not;此时态的谓语动词若为行为动词,则在其前加don't,如主语为第三人称单数,则用doesn't,同时还原行为动词.
5.一般疑问句：把be动词放于句首；用助动词do提问,如主语为第三人称单数,则用does,同时,还原行为动词.
6.例句：.It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
二、 一般过去时：
1.概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为.
2.时间状语：ago,yesterday,the day before yesterday,last week,last(year,night,month…),in 1989,just now,at the age of 5,one day,long long ago,once upon a time,etc.
3.基本结构：be动词；行为动词
4.否定形式：was/were+not;在行为动词前加didn't,同时还原行为动词.
5.一般疑问句：was或were放于句首；用助动词do的过去式did 提问,同时还原行为动词.
6.例句：She often came to help us in those days.
I didn't know you were so busy.
三、 现在进行时：
1.概念：表示现阶段或说话时正在进行的动作及行为.
2.时间状语：now,at this time,these days,etc.
3.基本结构：am/is/are+doing
4.否定形式：am/is/are+not+doing.
5.一般疑问句：把be动词放于句首.
6.例句：How are you feeling today?
He is doing well in his lessons.
四、 过去进行时：
1.概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作.
2.时间状语：at this time yesterday,at that time或以when引导的谓语动词是一般过去时的时间状语等.
3.基本结构：was/were+doing
4.否定形式：was/were + not + doing.
5.一般疑问句：把was或were放于句首.
6.例句：At that time she was working in a PLA unit.
When he came in,I was reading a newspaper.
五、 现在完成时：
1.概念：过去发生或已经完成的动作对现在造成的影响或结果,或从过去已经开始,持续到现在的动作或状态.
2.时间状语：recently,lately,since…for…,in the past few years,etc.
3.基本结构：have/has + done
4.否定形式：have/has + not +done.
5.一般疑问句：have或has.
6.例句：I've written an article.
The countryside has changed a lot in the past few years.
六、 过去完成时：
1.概念：以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”.
2.时间状语：before,by the end of last year(term,month…),etc.
3.基本结构：had + done.
4.否定形式：had + not + done.
5.一般疑问句：had放于句首.
6.例句：As soon as we got to the station,the train had left.
By the end of last month.We had reviewed four books
七、 一般将来时：
1.概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事.
2.时间状语：tomorrow,next day(week,month,year…),soon,in a few minutes,by…,the day after tomorrow,etc.
3.基本结构：am/is/are/going to + do；will/shall + do.
4.否定形式：was/were + not; 在行为动词前加didn't,同时还原行为动词.
5.一般疑问句：be放于句首；will/shall提到句首.
6.例句：They are going to have a competition with us in studies.
It is going to rain.
八、 过去将来时：
1.概念：立足于过去某一时刻,从过去看将来,常用于宾语从句中.
2.时间状语：the next day(morning,year…),the following month(week…),etc.
3.基本结构：was/were/going to + do；would/should + do.
4.否定形式：was/were/not + going to + do;would/should + not + do.
5.一般疑问句：was或were放于句首；would/should 提到句首.
6.例句：He said he would go to Beijing the next day.
I asked who was going there .
九.将来完成时：
1.概念：在将来某一时刻之前开始的动作或状态
2.时间状语：by the time of;by the end of+时间短语（将来）;by the time+从句（将来）
3.基本结构：be going to/will/shall + have done
十.现在完成进行时:
1.概念：在过去某一时刻之前开始的动作或状态一直持续到说话为止
2.基本结构：have/has +been+doing
几种常见时态的相互转换

桶重+2水重=3①
桶重+3水重=4②
②-①
水重=1千克
所以原来桶中有1千克水

n(n+1)/2=100
n(n+1)=200
13*14=182 14*15=210
n=14
1+2+3+4+5+6+7+8+9+10+11+12+13+14=105
答：从1加到 14 可得到100 还多5

解题思路：根据题意知道水重的2倍是9-5=4千克，由此求出原来水的重量．

水的2倍是：9-5=4（千克），
所以原来水重：4÷2=2（千克）；
答：原来水重2千克．

点评：
本题考点： 差倍问题．

考点点评： 本题考查了差倍问题．根据题意得出9-5=4千克是水重的2倍是解答此题的关键．

(5+5n)n/2=30300

先算（-1）+2两两结合 都等于1 共有100个数 就有50组 所以等于50

首项加末项,然后乘以项数,再除以二

1+2+3+……+59+60+60+59+……+3+2+1=2（1+2+3+……+60）=2*（1+60）*60/2=3660

浓硝酸加到蓝色石蕊试纸上,试纸先变红后褪色；
稀硝酸加到蓝色石蕊试纸上,试纸变红.
浓硝酸使试纸褪色,靠其强氧化性,也可称为漂白性,因腐蚀性强,不用作漂白剂

0

您好，翻译为 Please add some salt to the soup.
希望帮助你

1的平方加2的平方一直加到123456789的平方的个位数
=1/2*123456789(123456789+1)(2*123456789+1)的个位数
=9*5*9的个位数=5

滴定终点时溶液中是NaCl和水,ph为7
多加了一滴盐酸那么 n（H+）=（0.05×10^-3）×0.1 = 0.05×10^-4 mol
所以 c（H+）=（0.05×10^-4）÷（50×10^-3） = 1×10^-4 mol/L
所以最终 ph = 4

（1+100）x100÷2
=101x50
=5050
请好评

~在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.
如果你认可我的回答,敬请及时采纳,
~你的采纳是我前进的动力~~
~如还有新的问题,请不要追问的形式发送,另外发问题并向我求助或在追问处发送问题链接地址,答题不易,敬请谅解~~
O(∩_∩)O,记得好评和采纳,互相帮助
祝学习进步!

需要用到几个性质先
1,将行列式A的某一行或某一列乘以常数c
则得到的行列式B=cA.
2,设A,B,C为3个n阶行列式,它们的第i行第j列元素记为Aij,Bij,Cij,若A,B,C的第r行元素满足
Crj=Arj+Brj,而其他元素相同,则
C=A+B
3.若行列式2行相同,则行列式=0
这样就可以证明楼主的题目了.
首先利用性质2,把A、写成两个行列式之和,一个是A,另一个把倍数提出来（性质1）,行列式里有两个相同的行,i(就是j行过来的),j,那么这个行列式＝0（性质3）,所以A、=A
这样 ,题目得证.

化学啊 解答不了

百分之八十
溶液中增加的质量其实是CaO的质量 因为碳酸钙和盐酸反应 二氧化碳挥发 真正留下来的是氧化钙
105.6-100=5.6 也就是说氧化钙5.6g 也就是0.1mol
所以碳酸钙有0.1mol 也就是10g
10/12.5=80%

(11.6-5.6)/(5-2)
= 6/3
= 2(千克)

1/3+1/15+...+1/(2003*2005)=1/2(1-1/3+1/3-1/5+...+1/2003-1/2005)=1/2(1-1/2005)=1002/2005

1
不仅 还要
2.
努力 懒惰
加强 减弱
3
1 3
4.
（1）他每天起床后都要求自己强记一些外语单词
（2）精通 广博
（3）他不但精通文学、历史、哲学，而且有广博的自然科学知识，还熟练掌握了五种外语。
5.
可见，靠勤奋锻炼和科学方法是可以有效地增强记忆力的。
6.
简要讲述了增强记忆里的好处和方法。
7.
除了文中所述的背单词之外，我们还可以选择记歌词的方法。找很多喜欢听的歌曲，边唱边记。

那个,你们班怎么参观我不知道,只能这样了.请采纳.
今天大清早,我和我们班的一些同学及家长在徐老师的带领下,来到科技馆参观.
我们进入科技室,“哇”里面有许多科技物品.有一窗两景、人体导电、动物的视觉、海市蜃楼、气流音乐转盘、穿墙而过、齿轮转动、万花筒、菲涅尔透镜等等.
一窗两景的原理是,有一个箱子上面有一个窗户,透过窗户,里面有两个画面,也就是说箱体里有一面半透半反射镜将箱体隔成两部分.
我又看到一个同学把手伸到伸到一个箱体里乱抓,过一会又空着手出来了,我走过去一看,是海市蜃楼,只见箱体里有一个草莓,我也伸手去抓,可什么也没抓到.原来是草莓经凹透镜反射,会形成影像,影像与物体呈球形对称,这就是凹透镜的成像原理.
现在,环境污染很严重,有土壤污染、大气污染,而且城市里的温度很高,这样会影响许多城里人的身体健康,还会得一些疾病,像哮喘病、心脏病、肺气肿等等可怕的疾病.
我们看完这些这些科技知识,觉得真是受益匪浅.然后我们又上楼看了一些别的同学做的科技小制作,当时我的心里就想,我也要做一个好的科技小制作.
通过参观,我又知道了一些知识,开阔了我的视野,丰富了我的思想!
再次恳求采纳

平方和公式n(n+1)(2n+1)/6 　　即1^2+2^2+3^2+…+n^2=n(n+1)(2n+1)/6 (注：n^2=n的平方)
带入公式即可：27 1293 1506

首先Zn物质的量是0.1mol,可以和0.2molH+反应.现在H+有0.5mol所以是计算按照Zn来算.
Zn+2H+=Zn2++H2↑
65 2 1
6.5 x y
x=0.2mol,y=0.1mol
c(Zn2+)=0.1/0.5=0.2mol/L,c(H+)=(0.5-0.2)/0.5=0.6mol/L

解题思路：（1）根据SO₂的漂白原理来解释；
（2）根据Cl₂的漂白原理来解释；
（3）根据SO₂的还原性来解释．

（1）因二氧化硫漂白原理在于能与有机色素结合成无色的不稳定化合物，加热后，无色不稳定的化合物分解，又恢复原来的颜色．当向品红溶液中通入过量的SO₂时，发生如下反应：SO₂+H₂O⇌H₂SO₃，生成的酸能使品红溶液红色加深，因SO₂过量，SO₂与品红溶液结合成不稳定的无色物质而褪色，加热无色物质分解又逐渐恢复到原来的红色，
故答案为：溶液颜色先变深后又逐渐褪去；逐渐恢复原来的红色；
（2）Cl₂的漂白原理是和H₂O反应生成的HClO具有强氧化性，与二氧化硫漂白原理不同．当向品红溶液中通入Cl₂，因Cl₂+H₂O⇌HClO+HCl，同样生成了酸，品红溶液红色加深，因Cl₂过量，Cl₂与水反应产生的HClO氧化有色物质而使其褪色，加热后不再恢复红色，故答案为：溶液的颜色先变深后又逐渐褪去；
（3）已知盐酸加到品红溶液中，能使品红溶液的红色加深，当向品红溶液中通入1：1的SO₂和Cl₂时，两者发生以下反应：Cl₂+SO₂+2H₂O═2HCl+H₂SO₄，因生成了酸，使品红溶液颜色加深，故答案为：溶液的红色比原来加深．

点评：
本题考点： 二氧化硫的化学性质；氯气的化学性质．

考点点评： 本题主要考查了二氧化硫、Cl2的漂白原理，两者的漂白原理不同，需要注意的是虽然两者都有漂白性，但两者以1：1通入溶液时不具有漂白性，原因是两者发生反应：Cl2+SO2+2H2O═2HCl+H2SO4．