我真的木有理解这道题,

先写整数部分,在写小数点,最后写小数部分

duibuqi a

-_-……这样问哪会有答案……人家又不是都有这本书,总不能去书店把书找来吧……
要求答案只有把题发过来……

直译：
The poor girl says:" there's no happy things there"
The poor girl says that there's no happy things there.
happy things:开心的事
意译
The poor girl says:" there's nothing to be happy there." 可怜的女孩说那没有什么可开心的.
The poor girl says that there's nothing to be happy there.
开心：be happy
也可用过去时态表示：
The poor girl said there was no happy things there.

给老师的一封信
亲爱的老师：
您好!
小鸟长出了丰满的羽毛,要冲出云霄.但这又是谁的功劳?是您,老师.时间轻瞬即逝,但在离别的明亮的教室,我好像在听你聚精会神的讲课,熟悉的课桌,还留着你的淳淳教诲,笔直的跑道,还留着你的加油助喊和鼓励,这一切的一切让我难忘,让我历历在目,记忆犹新.
还记的吗?你为我们历尽了艰难险阻.班内差生多,在别的老师眼里一个字,累,太累了.但你不同,你无论有多忙,你总会一丝不苟的教差生；无论学生多烦,你都会耐心教导,危难时刻,你总会把学生放第一位.我终于知道为什么,古人为什么总称赞老师,称赞您的无私,您的负责,您的一丝不苟.你在我们心中永远这么伟大,这么圣洁,这么无私.老师我还记的您,无数次的带病上课,虽然很累,你还是坚持上课.有时为了不影响我们上课,咳嗽时,你总到外面咳；头痛时,你也坚持把课上好.为了我们,你不知遭受了多少折磨,但你不放弃,因为你爱我们,你不忍心抛下我们不管.
　　插柳之恩,终身难忘.老师我论时间流逝多久,你的恩情我终生难忘.不管我是小草,还是参天大树,你的鼓励,教诲永远在我耳畔,在我心间,永远让我难以忘怀.
祝：
身体健康,
工作顺利!


您的学生：***

这个老师那会有的

设这种商品的进价为x元.
根据题意得
（X+40）*80%－x＝12
解这个方程得
X=100
答：这种商品的进价为100元.

我们向往大自然,因为大自然的春天有鲜花散发的缕缕幽香；夏日有荷叶携带的阵阵清凉；秋天有（高粱传送的浓浓的喜悦）；冬日有（白雪映衬的皑皑银装）.
希望帮助到你,若有疑问,可以追问~~~
祝你学习进步,更上一层楼!(*^__^*)

1
(72+79/3)×1/11=(216/3+79/3)×1/11={(216+79)/3}×1/11=(295/3)×(1/11)=295/33
2【3/4÷(4/5+1/4)-4/7】×9/11
=【3/4×{1/(4/5+1/4)}-4/7】×9/11
=【(3×1)/{4×(4/5+1/4)}-4/7】×9/11
=【3/(16/5+1)-4/7】×9/11
=【3/(21/5)-4/7】×9/11
=【3×(5/21)-4/7】×9/11
=【5/7-4/7】×9/11
=(1/7)×9/11
=9/77
行不?

写现代文,完全是在翻译的基础上,加一点普通话,环境描写,使文章连贯,像一个故事,这样写优秀.

本着有则改之,无则加勉的原则,写明实际情况,既不添枝加叶,也不避重就轻,实事求是写清楚过程就可以了,有错误就虚心承认错误,保证以后改正,没有错误把过程写详细就可以了!

1 d
2 a
3 c
4 d
5 c

语法啃透,不停记单词,听,说,写.每天都要复习并且学习新的.

露珠握爪，我还想问危机昏和大物雾呢T_T

找同学借嘛

แนะนำการท่องเที่ยวประเทศไทย
泰国旅游推荐（介绍）

由两圆有三条公切线知道两圆外切
第一个圆方程化简得圆心是(-a,0) r=2 第二个圆方程化简得圆心是(0,2b) r=3
∴ 两圆心距离=3 代入两点间距离公式有 a^2+4b^2=9
即(a^2+4b^2)/9=1
∴ 1/a^2+1/b^2=(a^2+4b^2)/9a^2+(a^2+4b^2)/9b^2=1/9*(1+4b^2/a^2+a^2/b^2+4)≥1/9*(5+2√4）=1/9*（5+4）=1
选C

生活越来越好 近年来,我的家乡有了天翻地覆的变化：一座座大楼拔地而起,马路上的奔跑的汽车越来越多越来越好,曾经泥泞的小土路现在都变成了宽敞的柏油马路,我们一家从村子里的小平房搬进了市里的高楼.
　　想想小时侯,我们家住在平房里,简单的几间房子,厕所下雨的时候都没法用.前几年,我们家住进了高楼,宽敞,干净.而且,我也有了自己的房间,妈妈买了全自动的洗衣机,爸爸也搬回了布沙发,软软的床,电视机等.
　　但是,现在,我们家又“更上一层楼”了,我们又买了电脑,汽车,热带鱼鱼缸,还有很大的餐桌,书柜,布沙发也换成了皮沙发.
　　再回老家一看,呵,也不错嘛!老家里的马路已经十分多了,几乎没有什么土路了.马路的旁边也都装上了漂亮的路灯,还有各种绿化让空气变更清新了.平房越来越少,都盖成了集中供暖的楼房,所以,我们老家的环境到了冬天也是那么的好.
　　呵呵,我还是不多说了,你有时间的话自己来一趟,相信你会吃惊的说：“难道这里就是农村吗!”
　　我们市里也是美的让人吃惊,弥河沿岸的景色是我见过最美的景色,还有荷花节,蔬菜博览会等等让人赞叹的节日.
　　啊!我爱我的家乡,因为她现在实在是太美了!如果这里改成旅游景点的话,一定会让游客们流连忘返.
　　这就是我成长的家乡,在我十年的人生路上,我亲眼看着自己和自己家乡的变化,我相信等过不了多少年,当我长成一个有用的人才的时候,家乡也能变成一个扬名全国甚至世界的地方.

Unit4
A Night the Earth didn’t Sleep
x09Strange things were happening in the countryside of northeast Hebei.For three days the water in the village wells rose and fell,rose and fell.Farmers noticed that the well walls had deep cracks in them.A smelly gas came out of the cracks.In the farmyards,the chickens and even the pigs were too nervous to eat.Mice ran out of the fields looking for places to hide.Fish jumped out of their bowls and ponds.At about 3:00 am on July 28,1976,some people saw bright lights in the sky.The sound of planes could be heard outside the city of Tangshan even when no planes were in the sky.In the city,the water pipes in some buildings cracked and burst.But the one million people of the city,who thought little of these events,were asleep as usual the night.
x09At 3:42 am everything began to shake.It seemed as if the world was at an end!Eleven kilometers directly below the city the greatest earthquake of the 20th century had begun.It was felt in Beijing,which is more than two hundred kilometers away.One-third of the nation felt it.A huge crack that was eight kilometers long and thirty meters wide cut across houses,roads and canals.Steam burst from holes in the ground.Hard hills of rock became rivers of dirt.In fifteen terrible seconds a large city lay in ruins.The suffering of the people was extreme.Two-thirds of them died or were injured during the earthquake.Thousands of families were killed of injured reached more than 400,000.
x09But how could the survivors believe it was natural?Everywhere they looked nearly every thing was destroyed.All of the city’s hospitals,75% of its factories and buildings and 90% of its homes were gone.Bricks covered the ground like red autumn leaves.No wind,however,could blow them away.Two dams fell and most of the bridges also fell or were not safe for traveling.The railway tracks were now useless pieces of steel.Tens of thousands of cows would never give milk again.Half a million pigs and millions of chickens were dead.Sand now filled the wells instead of water.People were shocked.Then,later that afternoon,another big quake which was almost as strong as the first one shook Tangshan.Some of the rescue workers and doctors were trapped under the ruins.More buildings fell down.Water,food,and electricity were hard to get.People began to wonder how long the disaster would last.
x09All hope was not lost.Soon after the quakes,the army sent 150,000 soldiers of thousands of people were helped.The army organized teams to dig out those who were trapped and to bury the dead.To the north of the city,most of the 10,000 miners were rescued from the coal mines there.Workers built shelters for survivors whose homes had been destroyed.Fresh water was taken to the city by train,truck and plane.Slowly,the city began to breathe again.

呢喃形容燕子的叫声

有在爱词霸里搜

注意到棒在经过圆形磁场时候,有效长度是随着改变的
假设经过时间t,则棒离开始地点的距离为vt,则它到圆心的距离就为R-vt
画一个三角形,在半个有效长度是 根号下 R^2-(R-vt)^2
所以整个长为2 根号下 R^2-(R-vt)^2
根据e=Blv 将l带入即可
e=2Bv根号下 R^2-(R-vt)^2

1.How ( does ) your father usually ( get ) (get) to school?
He ( rides ) (ride) his bike
2.It took him only two minutes ( to walk )(walk) to school
3.I'm new here .I need ( to buy )(buy) a map of the city.
4.I'm was ( )(illness) after he got wet in the rain
5.The bus ride( takes )(take) about 25( minutes )(minute)

通过这次主题队会,使我们深受教育.（删去“使”）,否则句子缺少主语.

去歪歪学,免费

函数f（x）=x^2+ax+3 定义域[0,2]
开口向上,对称轴为x=-a/2
最大值：
因为开口向上,所以,最大值不可能是对称轴的时候取得,肯定是区间端点处取得,问题就在于到底是哪一个端点处取得最大值,这就需要比较两个端点到对称轴距离的远近
易知,当对称轴是区间中点时,端点处的函数值一样大,均是最大值
所以：
（1）当对称轴位于区间中点的左边时,区间右端点到对称轴距离远
即：-a/2≦1,即a≧-2时,x=2时,有最大值f(2)=2a+7
（2）当对称轴位于区间中点的右边时,区间左端点到对称轴距离远
即：-a/2>1,即a

将硫酸锂溶于水,用纯碱沉淀生成碳酸锂.

!注意 你的r应该有数据 否则是无界解;
model:
sets:
s/1..3/:w,r,a,b;
l(s,s):c;
endsets
data:
a=0.2 0.1 0.15;
b=0.6 0.5 0.55;
c=
0.0533 0.3053 -0.0700
0.3053 21.6396 -4.3033
-0.0700 -4.3033 0.8575;
enddata
max=rp-q;
rp=@sum(s:r*w);
q=@sum(l(i,j):c(i,j)*w(i)*w(j));
@for(s:@bnd(a,w,b));
@sum(s:w)=1;
end

一、下列物质
①盐酸 ②KOH固体 ③CO2 ④CuO ⑤Na
⑥CaCO3 ⑦AgNO3溶液 ⑧浓H2SO4 ⑨乙醇 ⑩Cl2
（1）属于电解质的有（2、4、6、8）
（2）属于非电解质的有（3、9）
（3）即不属于电解质也不属于非电解质的有（1、5、7、10）
电解质是在熔融状态下或水溶液中能导电的“化合物”.
非电解质是在熔融状态下和水溶液中都不能导电的“化合物”.
不属于电解质和非电解质的物质是单质和混合物.
二、写出下列物质的电离方程式
1.H2SO4=2H+ +SO4 2-
2.Ca(OH)2=Ca2+ +2OH-
3.Al2(SO4)3=2Al3+ +3SO4 2-
4.Na4NO5?这个物质的化学式不正确,请检查.
应该是NH4NO3吧.NH4NO3=NH4+ +NO3-

www.***.cn这个网站上有

(比赛场上的选手）基德尔 对 华莱尔

那里的

点滴成长

　　我的老师　　老师是一盏明亮的灯,照亮夜行的路；老师是罗盘,给船舶导引方向；老师是辅导者,指引我们走上正确的道路,让我们少走弯路……　　我印象最深的老师是我们五六年级的安宁老师.她是我们的副班主任,但她比...

这都是你自己没有养成良好的作息习惯.那你就现在赶快抓紧时间把没有做完的补上!把看电视和玩的时间用在做作业上,就OK了!

美国COACH品牌手袋出口部分产品流向我处.我将出售少数的有多种颜色的,由COACH工厂直销的手袋产品（到目前为止,这几天天结束前,我感到非常自豪.统计页面上,毫无疑问的COACH手袋直销店网上独此一家您可以访问到上述页面）注：如果您发表这样的帖子“我知道这不是独立经营的,任何高于ISO-800,都会有纹理感”,这是无用的谢谢你,COACH网上直销店,我很激动,我回来了!我喜欢写故事.请阅读之前注意论坛的发帖规则.
这篇英文短文本身就很多语病和解释不通的地方.只能翻成这样了.不容易啊!自己翻的!

把碳酸钠和氢氧化钙的反应生成碳酸钙的方程式写出来看系数比,那12克就是碳酸钙.12除以碳酸钙的相对分子质量,得到碳酸钙的物质的量,再把这物质的量按前面的系数比比出碳酸钠的物质的量,乘以碳酸钠的相对分子质量,得到碳酸钠的质量,再除以100,最后乘以百分百就好咯.这图看的真累啊.

不对,宇宙中是没有别的东西,但是飞船有自带的燃料就够了.
如果你觉得飞机在天上飞是它向后“扔”空气得到的反作用力,那么飞船就是在宇宙中向后面“扔”燃料燃烧产生的高速气体就能得到的反作用力,跟宇宙中有没有东西无关的.

I went to Beidaihe with my parents last summer vacation.It took us about three hours to drive there.It was a fine day.The sun was shining and the birds were singing.When we got there,there were thousands of people.We walked on the beach for about two hours.We also went boating and swam in the sea.We ate lots of delicious sea food.The most interesting thing was that it was my first time to catch craps.It was really fun.We enjoyed ourselves very much.

沙里淘金
的有木有

电解质是溶于水中或在熔融状态下能够导电的化合物.
非电解质是溶于水中或在熔融状态下不能够导电的化合物.
在水溶液中几乎完全发生电离的电解质叫做强电解质；反之为弱电解质.
导电的性质与溶解度无关,强电解质一般有：强酸强碱,大多数正盐,如：碳酸钠、硫酸铜；弱电解质（溶解的部分在水中只能部分电离的化合物）一般有：弱酸、弱碱,如；醋酸、一水合氨（NH3·H2O）,以及少数盐,如：醋酸铅、氯化汞.另外,水是极弱电解质.

沉默是我无法掩饰的忧伤

这个素材其实不难.
它的含义是：人无论做什么事情都应该劳逸结合.
“让灵魂追上疲惫的身体”意思是：人已经很疲惫了,怕灵魂追不上,需要休息等待疲惫的灵魂（心理）追上来,才不会感到疲惫……你仔细想想内容吧,讲述下劳逸结合的好处.

髭,读zi,第一声

表面积：（2*1+1*2+2*2）*2=16cm²体积：2*2*1=4cm³