跪谢!First aid is the kind of help ___1____ (give) to someone

score 和dozen在前面是确定的数词如2 3等用单数如:
the biblical age of three score years and ten
5 score years ago(语出马丁路德金的我有一个梦想)
而前面没有数次表示很多时用scores和dozens如:
There were scores of boxes and crates

已知某点的运动方程为s=a+bt(a,b为常数）,则点的轨迹为（C）
点在地球表面沿经线圈做匀速运动,已知点的速度大小为V,地球半径为R,则点的加速度（A）等于V^2/R,方向（A）指向球心
在曲线运动中,动点所走过的路程是它在某一时间间隔内沿轨迹所走过的弧长,其值与坐标原点的位置(无关).

The place you stayed is my heaven, I yearned to drift no longer for you
The place you stayed is my heaven, for stay with you make me yearn no longer to drift.

同学你好!
5.答案为C；
太阳光线经过C点和O点,说明OC弧所在大圆经过地心,即O和C在同一个大圆,两个点的太阳高度角相差30°,故其对应的弧度也是30°.第10题选C；
6.答案为C；
点A与点B纬度相同,点B为12时,正午太阳高度为30°,说明太阳直射在15°N,与太阳直射点关于地心对称的点太阳高度角为-90°,而D点距离该点的弧度为30°,所以推知D点的太阳高度为-60°.

矩阵的最大特征值:5.2968
特征向量
-0.1392 -0.0643 + 0.0407i -0.0643 - 0.0407i 0.1082 + 0.4008i 0.1082 - 0.4008i
-0.3507 -0.0570 + 0.2862i -0.0570 - 0.2862i -0.1991 - 0.3153i -0.1991 + 0.3153i
-0.8811 0.9386 0.9386 0.6256 0.6256
-0.0725 -0.0142 - 0.0515i -0.0142 + 0.0515i -0.1483 - 0.0207i -0.1483 + 0.0207i
-0.2756 -0.0995 - 0.1236i -0.0995 + 0.1236i 0.3104 - 0.4225i 0.3104 + 0.4225i

Holiday ideas are changing
Holidays are always big days or important days in our lives. However, the ways of celebrating are changing.
Once when it came to holidays, people paid much attention to things to eat, especially when there was not enough food or people were too poor to afford good food. Another way of celebrition was to put on beautiful clothes, which were not worn everyday. People felt very happy when they looked pretty and enjoyed the food of "heaven".
However, these things are very common today. Everyday, we eat what we want and dress what we like because we are rich. It seems that we are not satisfied with the basic material needs. We have a higher level of needs, such as watching a movie, traveling around the country, going abroad, or even doing physical exercise. The holiday ideas are changing because of the improving living standard.
We have more interesting ways of enjoying our lives, but we are not as happy as before. We have much more desires to be met. We want bigger houses, earn more money, drive better cars only to find we work much harder, eat less and sleep less, worry a lot, have less time with our family, have bad mood and poor health... We begin to miss the good old days, when we once lived a simple but happy life.
注：最后一段是个人感慨,仅作参考,不算正文内容.

含“寻”的诗句：
胜日寻芳泗水滨,无边光景一时新.等闲识得东风面,万紫千红总是春.——朱熹《春日》
众里寻他千百度,蓦然回首,那人却在灯火阑珊处.——辛弃疾《青玉案•元夕》
五岳寻仙不辞远,一生好入名山游.——李白
春来遍是桃花水,不辨仙源何处寻.——王维《桃园寻》
自是寻春去叫迟,不须惆怅怨芳时.——杜牧《怅诗》
千寻铁锁沉江底,一片降幡出石头.——刘禹锡《石头城》
寻常一样窗前月,才有梅花便不同.——杜爵《寒夜》
表达“寻”的意思的诗句：
上穷碧落下黄泉,两处茫茫皆不见.——白居易《长恨歌》
借问酒家何处有,牧童遥指杏花村.——杜牧《清明》
过尽千帆皆不是,斜晖脉脉水悠悠.——温庭筠《望江南》

Art Rice阿特莱斯
用户赞美贵公司的肥料：啊!特莱仕!

当a=1/e时,他们相切,切点为（根号e,1/2）,切线方程为y=1/ 根号e x-1/2；
法线就可以自己算出来了.
具体方法很简单,将两曲线联立求二元二次方程,求出切点,然后带入y=ax^2中,即可得到a的值.在解方程过程中需要将等式两边求导.下来知道切点和曲线方程了,自然就可以求出切线和法线方程了.

读书要做到专心致志——董仲舒三年不窥园.
董仲舒专心攻读,孜孜不倦.他的书房后虽然有一个花园,但他专心致志读书学习,三年时间没有进园观赏一眼,董仲舒如此专心致志地钻研学问,使他成为西汉著名的思想家.
读书要做到不惧条件艰苦——匡衡凿壁偷光.
西汉时期,有一个特别有学问的人,叫匡衡,匡衡小的时候家境贫寒,为了读书,他凿通了邻居文不识家的墙,借着偷来一缕烛光读书,终于感动了邻居文不识,在大家的帮助下,小匡衡学有所成.在汉元帝的时候,由大司马、车骑将军史高推荐,匡衡被封郎中,迁博士.
读书要做到不惧条件艰苦——车胤囊萤夜读.
车胤,字武子,晋代南平（今湖北省公安市）人,从小家里一贫如洗,但读书却非常用功,“家贫不常得油,夏月则练囊盛数十萤火以照书,以夜继日焉.”车胤囊萤照读的故事,在历史上被传为美谈,激励着后世一代又一代的读书人.
读书要做到不惧他们眼光——陈平忍辱苦读书.
陈平西汉名相,少时家贫,与哥哥相依为命,为了秉承父命,光耀门庭,不事生产,闭门读书,却为大嫂所不容,为了消弭兄嫂的矛盾,面对一再羞辱,隐忍不发,随着大嫂的变本加厉,终于忍无可忍,出走离家,欲浪迹天涯,被哥哥追回后,又不计前嫌,阻兄休嫂,在当地传为美谈.终有一老着,慕名前来,免费收徒授课,学成后,辅佐刘邦,成就了一番霸业.
读书要做到知耻后勇——万斯同闭门苦读.
清朝初期的著名学者、史学家万斯同参与编撰了我国重要史书《二十四史》.但万斯同小的时候也是一个顽皮的孩子.万斯同由于贪玩,在宾客们面前丢了面子,从而遭到了宾客们的批评.万斯同恼怒之下,掀翻了宾客们的桌子,被父亲关到了书屋里.万斯同从生气、厌恶读书,到闭门思过,并从《茶经》中受到启发,开始用心读书.转眼一年多过去了,万斯同在书屋中读了很多书,父亲原谅了儿子,而万斯同也明白了父亲的良苦用心.万斯同经过长期的勤学苦读,终于成为一位通晓历史遍览群书的著名学者,并参与了《二十四史》之《明史》的编修工作.
读书要做到不惧条件艰苦——屈原洞中苦读.
屈原小时侯不顾长辈的反对,不论刮风下雨,天寒地冻,躲到山洞里偷读《诗经》.经过整整三年,他熟读了《诗经》305篇,从这些民歌民谣中吸收了丰富的营养,终于成为一位伟大诗人.
范仲淹断齑划粥.
范仲淹从小家境贫寒,为了读书,他省吃俭用.终于,他的勤奋好学感动了寺院长老,长老送他到南都学舍学习.范仲淹依然坚持简朴的生活习惯,不接受富家子弟的馈赠,以磨砺自己的意志.经过刻苦攻读,他终于成为了伟大的文学家.
读书要做到不惧条件艰苦——玄奘苦学佛法.
玄奖是唐代一位高僧,为了求取佛经原文,玄奘从贞观三年八月离开长安,万里跋涉,西行取经,终于到达印度,历时十七年,著有《大唐西域记》,为佛教和人类进步、世界文明作出了伟大的贡献.
读书要做到坚持——李晟练成神箭手.
李晟的父亲是一员威武的大将,李晟希望长大成为父亲一样的人.可是,父亲却总是说他年纪小,不能习武.李晟不甘心,偷偷学习射箭,终于练成了百发百中的神箭手,让父亲刮目相看.
欧阳修借阅典籍.
北宋大文学家欧阳修,自幼天资过人,但是由于家境贫寒,家里无钱买纸买笔,欧阳修的母亲郑氏为了让儿子习文练字,想出了一个巧妙的办法,用荻草代替毛笔教小欧阳修写字.欧阳修勤奋刻苦,练成了一手好字,成为远近闻名的神童,而这种刻苦精神也影响了他的小伙伴李尧辅,将李尧辅带上好学之路.
读书要做到不耻下问——蒲松龄草亭路问.
清代文学家蒲松龄在路边搭建茅草凉亭,记录过路行人所讲的故事,经过几十年如一日地辛勤搜集,加上自己废寝忘食的创作,终于完成了中国古代文学史上划时代的辉煌巨著《聊斋志异》.
读书要做到尊师重教——宋濂冒雪访师.
明朝著名散文家、学者宋濂自幼好学,不仅学识渊博,而且写得一手好文章,被明太祖朱元璋赞誉为“开国文臣之首”.宋濂很爱读书,遇到不明白的地方总要刨根问底.这次,宋濂为了搞清楚一个问题,冒雪行走数十里,去请教已经不收学生的梦吉老师,但老师并不在家.宋濂并不气馁,而是在几天后再次拜访老师,但老师并没有接见他.因为天冷,宋濂和同伴都被冻得够呛,宋濂的脚趾都被冻伤了.当宋濂第三次独自拜访的时候,掉入了雪坑中,幸被人救起.当宋濂几乎晕倒在老师家门口的时候,老师被他的诚心所感动,耐心解答了宋濂的问题.后来,宋濂为

y=-sinx+ln π/3是y＂=sinx的 特解

Room 3506, Bldg. Wujiaohua,
No. 26, North Huaihe Road,
Tongling, Anhui,
P.R.China

Some children can not go to school because their families are very poor.With the help of the Hope Project,they have a chance to attend school.How should we do to help them?What can we do for the Hope Project?We should raise some money for the Hope Project,or donate some books or stationeries to the children.

每个人一定都有自己的爱好,相信每个人的爱好也一定会与众不同,我的爱好,认识我的人一定早已猜出来了,我的爱好是舞蹈,普通的不能在普通了.
我自打上幼儿园就开始学舞蹈,妈妈和老师对我的期望很高,老师说,我身子骨很软,天生的软,只要好好练,舞蹈就会很好,我一直非常用功的练舞蹈,所以,舞蹈很好,幼儿园毕业后,我就开始学拉丁舞和中国舞,我在幼儿园的舞友们,因为比我小,所以还没毕业,不久,我的舞蹈老师又休产假,我们集体停了一年,一年过后,我和舞友们再次回到从前的舞蹈房,又开始了第二次的舞蹈旅程,因为先前我学了很长一段时间的拉丁舞,所以,我的胯等各个部位,都处于一种扭得状态,一时间是改不过来的,我必须要比别人多下功夫,才能回到原来的样子,所以,我在做任何动作的时候都很艰难.
就这样,上学了,上三年级了,我的舞蹈老师要离开幼儿园了（因为之前幼儿园毕业后我一直在幼儿园练舞蹈）,她要自己办班,所以我们又一直跟着她,我的各个部位终于恢复原状了,我又可以像以前那样,无忧无虑的跳舞了,我简直是太高兴了,跟着舞蹈老师的那段日子,我的舞蹈非常好,软度也非常的好.
放假了,我们放了一个假期,因为在假期里我光想着玩儿了,把练舞的事抛到九霄云外去了,所以,回来后,我的软度差得要命,老师说,如果两个月不练舞蹈,那么,你在练两年也补不回以前的功了,我就是在那个时候,泄气了,就是在那个时候,开始讨厌舞蹈了,就一直没好好的练,最后,补不回来了,我又开始加倍的努力的练,但不管练多少,还是补不回以前的功了,所以,才到了今天这个地步,其实也没怎么样,也没多么差,也挺好的,就是没以前好了,但是,我还是觉得非常不好,按我的功底子,现在应该能自己过前桥后桥了,还有,前、旁、后腿至少能扳到200度了.
我的爱好 我有一个爱好——读书. 有一次,康赛鲲约我出去上操场玩,他在操场足足等了我半个小时,还没见我去.他便急忙跑到我家找我,一看我正在津津有味的读《西游记》呢,于是,他就气冲冲的大叫：“我在操场等你,你却在家里偷着看猴哥呢.”我不好意思的笑了,连忙道歉：“你看,我只顾看书把你给忘了,真是对不起.”我指着一本《三国演义》对他说：“既然来了,就看一会吧!”康赛鲲也打看书看来起来. 星期天,妈妈带我去汝南玩,一下车我,就赶紧跑进了书店.我顺着书架寻找我喜欢的书,我忽然看见一本好书——《恐龙王国》.我就拉着妈妈让她给我买.妈妈说：你已经有那么多书了,等看完了再来买.“我一见这着不灵,就使出了我的绝招,我装出一副可怜相,拉着妈妈说：“好妈妈的就给我买一本吧.”这着果然不错,妈妈给我买下了《恐龙王国》.妈妈领着我去逛商场,我趁着妈妈不注意,又流进了书店,我在书店里看了一会书,妈妈来了,指着我的鼻子说：“你这小鬼,我想你就跑到这儿来了.”妈妈有去逛了一会商场就来喊我了：“小书迷,走回家了.”我只好恋恋不舍的离开了书店. 看书是我的爱好,看书不仅可以丰富我们的课余生活,还可以增长我们的知识.我希望所有的小朋友都爱读书.（是从网上筛选的哦,你可以根据自身情况更改,望采纳）

{1} 1-5 BCDBA 6-8 BCA
{2} 1.Tips/Instructions
2.problems
3.size
4.feeling/getting
5.board
6.number
7.safe
8.phone
9.way/method
10.List
是这个吗?还有一篇作文我没打出来呀!

(x+y)(x+y+2xy)+(xy-1)(xy+1)
=(x+y)²+2xy(x+y)+(xy)²-1
=(x+y+xy)²-1
=(x+y+xy-1)(x+y+xy+1)
=(x+y+xy-1)(x+1)(y+1)
(x²-2x)(x²-2x-2)-3
=(x²-2x)²-2(x²-2x)-3
=[(x²-2x)-3][(x²-2x)+1]
(x-3)(x+1)(x-1)²

Payment terms:t/t 50% in advance then t/t the balance against B/L.

(1)设a1=a，则An+An+1=aQ^n-1+aQ^n=（a+aQ）Q^n-1，因此a不可能等于0，因此为等比数列
；An+1-An=（aQ-a）Q^n-1，同理也为等比数列；An/An+1=1/Q，为常数列，也是等比数列；nAn=naQ^n-1显然不是。
(2)由题意知道，an=Sn-Sn-1=2n-11，因此nAn=2n^2-11n，在n=11/4处取到最小，又n必须是正整...

松树的特点：笔直,不论在多么恶劣的环境下,仍然耸立地生长着.以正直、朴素、坚强为美.
松树比喻有内在品质坚强的人.我们要学习松树的正直、朴素、坚强的许多内在品质,做一个品德高尚的人.
望采纳!

滋养层细胞就是饲养层细胞.
饲养层是饲养层细胞构成的那一层.
滋养层细胞是发育生物学中的名词,存在于桑葚胚向囊胚发育的过程中,能发育成胎盘.

Athletes competed in the race,the long-jump and the high jump.

应是无耻谰言.
谰,lán,动词,形声字,从言,阑(lán)声.本义:抵赖.
无耻谰言,就是没有根据的诬赖的话.
与此相关的词语还有：诬谰、抵谰、诋谰、诡谰、谰语、谰谩、谰辞、谰躛、谰调、谰词、谩谰、满谰、欺谰.

力的作用是相的
摩擦
降低重心,增加稳度x0d谢谢,

倍角公式
　　Sin2A=2SinA?CosA
　　Cos2A=CosA^2-SinA^2=1-2SinA^2=2CosA^2-1
　　tan2A=(2tanA)/(1-tanA^2)
　　(注：SinA^2 是sinA的平方 sin2(A) )
降幂公式
　　sin^2(α)=(1-cos(2α))/2=versin(2α)/2
　　cos^2(α)=(1+cos(2α))/2=covers(2α)/2
　　tan^2(α)=(1-cos(2α))/(1+cos(2α))
　半角公式
　　tan(A/2)=(1-cosA)/sinA=sinA/(1+cosA);
　　cot(A/2)=sinA/(1-cosA)=(1+cosA)/sinA.
　　sin^2(a/2)=(1-cos(a))/2
　　cos^2(a/2)=(1+cos(a))/2
　　tan(a/2)=(1-cos(a))/sin(a)=sin(a)/(1+cos(a))
　和差化积
　　sinθ+sinφ = 2 sin[(θ+φ)/2] cos[(θ-φ)/2]
　　sinθ-sinφ = 2 cos[(θ+φ)/2] sin[(θ-φ)/2]
　　cosθ+cosφ = 2 cos[(θ+φ)/2] cos[(θ-φ)/2]
　　cosθ-cosφ = -2 sin[(θ+φ)/2] sin[(θ-φ)/2]
　　tanA+tanB=sin(A+B)/cosAcosB=tan(A+B)(1-tanAtanB)
　　tanA-tanB=sin(A-B)/cosAcosB=tan(A-B)(1+tanAtanB)
　　积化和差
　　sinαsinβ = [cos(α-β)-cos(α+β)] /2
　　cosαcosβ = [cos(α+β)+cos(α-β)]/2
　　sinαcosβ = [sin(α+β)+sin(α-β)]/2
　　cosαsinβ = [sin(α+β)-sin(α-β)]/2
　两角和差
　　cos(α+β)=cosα·cosβ-sinα·sinβ
　　cos(α-β)=cosα·cosβ+sinα·sinβ
　　sin(α±β)=sinα·cosβ±cosα·sinβ
　　tan(α+β)=(tanα+tanβ)/(1-tanα·tanβ)
　　tan(α-β)=(tanα-tanβ)/(1+tanα·tanβ)
　　万能公式
　　sinα=2tan(α/2）/［1+tan＾(α/2)］
　　cosα=［1-tan＾(α/2)］/1+tan＾(α/2)］
　　tanα=2tan(α/2)/［1-tan＾(α/2)］
　　其它公式
　　(1)(sinα)^2+(cosα)^2=1
　　(2)1+(tanα)^2=(secα)^2
　　(3)1+(cotα)^2=(cscα)^2

After dinner,he often and parents walk togethe

De 平行oa
角deo 等于脚eoa
Oe 平分脚doa
脚doe 等于角eoa
Doe =deo

I grew up in a small village.I am the second child of the family,and my sister is the eldest.Our house is on the main street of the village so I always saw a lot of people on the streets There were farmers,fishermen,and a few merchants in the village.My sister and I used to play with the next-door children; their father is an elementary school teacher.Sometimes when we played together in the house we made so much noise that my mother wanted us to play outside,so we went to the seashore to look for crabs and clams,and pretty seashells,too.Also,we enjoyed running on the beach chasing each other.On breezy days we used to enjoy flying kites on the beach.When I look back on my early life in the village,I feel I had a happy childhood.

take a walk ; take walks; go for a walk;

Investment development and programming department,technique and safe management Dept.,inspect the audit room

发现诗意
生活并不缺乏诗意,缺乏的是发现诗意的眼睛.
　　每一个季节都是美好的,春天的“微雨众卉新,一雷惊蛰始”,夏天的“小荷才露尖尖角,早有蜻蜓立上头”,秋天的“荷尽已无擎雨盖,菊残犹有傲霜枝”,冬天的“木末芙蓉花,山中发红萼”,无一不体现了大自然的美.其中的诗意,我们似乎都曾经体味过.
　　大自然给我们展示了许多风景,但我们却甚少发现其中的诗意,更不能如古人出口成诗.“诗意”,只有活在具体境遇里面的人,有所感悟,并达到美的情思境界,才能体味出来.
　　“江山代有才人出,各领风骚数百年”,任何时代都会出伟大的诗人.李白、杜甫、白居易等人的诗句传颂千古,他们发现的诗意,令我们千年之后的后生小子们都深受感染.有道是“熟读唐诗三百首,不会做诗也会吟”,只要突破了那层神秘的膜,练出一双诗眼,就会发现其实诗意随处都有,作诗吟唱也是触手可及,并非登天之难事.伟大诗人的诗都取材于身边,有什么奇怪呢?那些格律、平仄,也都是从黎民百姓哼唱的小曲演变而来的,非常自然.我们在身边发现了诗意,也许也会变成想象中拥有高雅艺术的诗人呢.
　　于是,又想到了苏轼,他那豪放派诗词告诉我们,寻觅诗意,创作诗词,几乎都与生活密切相关,都是丰富经历和深厚感触迸出的火花.
　　我们周围的景色,被古人的一首首诗、一阙阙词描绘出了不同的精神境界,被赋予了伟大的品质.与其说是诗人的一种涵养,倒不如说是诗人的一种独特的视角,使一事一物具有了诗意.当我们在语文老师的启迪下,赞叹一首诗的手法之巧、功力之深时,却忽略了只要我们细心观察、仔细体会、换一种视角,我们也能够感觉出同样的或别样的情感,发现诗意就在我们的身边；如果抓住这束灵感火花,构思挥毫,诗作就出来了.
　　“当庭始觉春风贵,带雨方知国色寒.”只有充分理解了自己的人生经历,所作所为,所感所悟,才写得出这样脍炙人口的诗句.
　　诗意,从生活中来,从身边取材,从美去感受.让我们睁大眼睛,不断地去发现诗意吧!

试着翻译一下,非直译：
The one who you care about too much will care less about you.

我i有现成 要的联系

∵f(-5)=-3125a+125b-5c+2=m
∴-3125a+125b-5c=m-2
∵f(5)=3125a-125b+5c+2
∴f(5)=-(-3125a+125b-5c)+2
=-(m-2)+2
=4-m
∴f(5)+f(-5)=4
这是一种解法,另一种稍简单,不用f(-5)=m的
∵f(-5)=-3125a+125b-5c+2
f(5)=3125a-125b+5c+2
∴f(5)+f(-5)=4
其实另外可以证明：f(x)+f(-x)=4
因为函数图像是以点（0,2）中心对称的

列方程的关键就是未知量、已知量和对应关系,这个需要从题目中找,最主要的是对应关系,这个需要做点题找找感觉.

so that 是以便的意思
e.g I learn English so that I can speak with Americans
我学英语以便我与美国人交流
so as to 与so that 意思一致,用法不同 to 后接 动词短语
e.g.I learn English so as to speak with Americans
lead to 导致
e.g.THe lack of exercise leads to all kinds of diseases
缺乏运动导致各种疾病
cause 引起
e.g.The lack of exercise causes all kinds of diseases.
缺乏运动引起各种疾病
(个人认为从用法上意义上没什么区别,做题时翻成中文带进去看哪个合适就行了)
aim at 旨在 针对
e.g.We aim at quality rather than quantity.
我们的目的是重质不重量.

Eliminate Stress from Your Life ,just live your life bette

I really appreciate your reminde

你说的那段是 纪伯伦《先知》的第22章,英文如下：
(22)On Good & Evil
On Good & Evil
And one of the elders of the city said, "Speak to us of Good and Evil."
And he answered:
Of the good in you I can speak, but not of the evil.
For what is evil but good tortured by its own hunger and thirst?
Verily when good is hungry it seeks food even in dark caves, and when it thirsts, it drinks even of dead waters.
You are good when you are one with yourself.
Yet when you are not one with yourself you are not evil.
For a divided house is not a den of thieves; it is only a divided house.
And a ship without rudder may wander aimlessly among perilous isles yet sink not to the bottom.
You are good when you strive to give of yourself.
Yet you are not evil when you seek gain for yourself.
For when you strive for gain you are but a root that clings to the earth and sucks at her breast.
Surely the fruit cannot say to the root, "Be like me, ripe and full and ever giving of your abundance."
For to the fruit giving is a need, as receiving is a need to the root.
You are good when you are fully awake in your speech,
Yet you are not evil when you sleep while your tongue staggers without purpose.
And even stumbling speech may strengthen a weak tongue.
You are good when you walk to your goal firmly and with bold steps.
Yet you are not evil when you go thither limping.
Even those who limp go not backward.
But you who are strong and swift, see that you do not limp before the lame, deeming it kindness.
You are good in countless ways, and you are not evil when you are not good,
You are only loitering and sluggard.
Pity that the stags cannot teach swiftness to the turtles.
In your longing for your giant self lies your goodness: and that longing is in all of you.
But in some of you that longing is a torrent rushing with might to the sea, carrying the secrets of the hillsides and the songs of the forest.
And in others it is a flat stream that loses itself in angles and bends and lingers before it reaches the shore.
But let not him who longs much say to him who longs little, "Wherefore are you slow and halting?"
For the truly good ask not the naked, "Where is your garment?" nor the houseless, "What has befallen your house?"

由题意有a=5,b=4
令x=a*cosθ,y=b*sinθ,0

很多年前,一个(1)设租35座车共X辆,则学生人数35X人.
55（X-1）-35X=45
解得：X=5
所以：35×5=175人
设租35座车y辆,55座车（4-y）辆.
35y 55(4-y)>175
320y 400(4-y)

当然是越小越好了,导热系数越小,说明越能保温嘛.膨胀珍珠岩膨胀的倍数高,导热系数就会低,反正就是不好的.

The major job content is as follow:
1.According to hotel marketing plan and the customers source composition ratio requirement to complete the sales tasks to receive trading company clients,tourist groups and individual person and the sales target;
2.keep the contaction with the customer.make the different and suitable price to satisfy the different market and season.
3.analyse the customers'mind and demand for the establishment and other sides in the ginshop.make the targeted sales and marketing,provide customers'information to the public relations manager.
4.Actively participate in various promotional activities organized by hotels,develop new customers.
5.use customs techniques and sales techniques to work with all the people to expand the hotel impact.There are plans to carry out sales activities,each time out sales,sales reports must be written for each clients file,and there are plans to develop new customers.

is needed to做定语修饰action。这是个宾语从句。whatever action is needed to simplify the decision-making process and increase efficiency是一个完整的句子。take才是这个句子的大宾语。

where are my shoes?they are under the bed.
1.The cap is on the chair,
2.The book is on the black desk
3.Apples are in the bag,would you like to try some?

My paradise lies wherever you're.

是y=(2x+1)/(4x-9)吗?
dy/dx=[(2x+1)'(4x-9)-(4x-9)'(2x+1)]/(4x-9)^2
=[2(4x-9)-4(2x+1)]/(4x-9)^2
=(8x-18-8x-4)/(4x-9)^2
=-22/(4x-9)^2.

orn in hangzhou,dress in suzhou,eat in guangzhou,die in liuzhou

As I see it,the best holiday destination in China is the West Lake.Located in the inner city of Hangzhou,it extends over 2000 miles away.When you wander along the lake,you can breathe in the fresh air,appreciate the graceful willows on either side,or even better,go boating to your heart's content on the lake.There are many tourist attractions there,such as the broken bridge,and Lei Feng Tower.The legend says that a white snake was crushed down by the tower because it fell in love with a human being.How fascinating!
when the holiday comes over,don't hesitate to go to the West Lake.Its natural beauty,fascinating stories,and friendly locals all make it the best holiday destination in China.