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数C2 0429 作业 1.2组合与组合数作业(2)1.方程 的解集为 ( ) . . . . 2.式子 ( )的值的个数为 ( ) . . . . 3.若 ∶ ∶ = ∶1∶1,则m、n的值分别为 ( )A.m=5,n=2 B.m=5,n=5 C.m=2,n=5 D.m=4,n=44.有两条平行直线 和 ,在直线 上取 个点,直线 上取 个点,以这些点为顶点作三角形,这样的 ( ) . . . . 5. 从1,2,3,…,9九个自然数中任取三个数组成有序数组a,b,c,且a<b<c,则不同的数组有 ( )A.84组B.21组C.28组D.343组6. 从正方体ABCD—A1B1C1D1的8个顶点中选取4个,作为四面体的顶点,可得到的不同四面体的个数为 ( )A. -4 B. -6 C. -8 D. -127.化简: .8.若 ,则 的值为 ;9.在一次考试的选做题部分,要求在第1题的4个小题中选做3个小题,在第2题的3个小题中选做2个小题,第3题的2个小题中选做1个小题,有 种不同的选法。10.从1,3,5,7,9中任取3个数字,从2,4,6,8中任取2个数字,一共可以组成 个没有重复数字的五位数。11.①有3张参观券,要在5人中确定3人去参观,不同方法的种数是 ;②要从5件不同的礼物中选出3件分送3位同学,不同的方法种数是 ;12.5名工人分别要在3天中选择1天休息,不同方法的种数是 ;13.从 这 个数中选出2个不同的数,使这两个数的和为偶数,有 种不同选法。14.正12边形的对角线的条数是 .15.6人同时被邀请参加一项活动,必须有人去,去几人自行决定,共有 种不同的去法.16.在所有的三位数中,各位数字从高到低顺次减小的数共有 个。17.从5名男生和4名女生中选出4人去参加辩论比赛。(1)如果4人中男生和女生各选2人,有多少种选法?(2)如果男生中的甲与女生中的乙必须在内,有多少种选法?(3)如果男生中的甲与女生中的乙至少要有1人在内,有多少种选法?(4)如果4人中必须既有男生又有女生,有多少种选法?18.在200件产品中,有2件次品。从中任取5件.(1)“其中恰有2件次品”的抽法有多少种选法?(2)“其中恰有1件次品”的抽法有多少种选法?(3)“其中没有次品”的抽法有多少种选法?(4)“其中至少有1件次品”的抽法有多少种选法?19. (04浙江文) 已知数列 的前n项和为 (Ⅰ)求 ;(Ⅱ)求证数列 是等比数列.20(05浙江文).已知实数 成等差数列, 成等比数列,且 ,求 .21.(06浙江文)若S 是公差不为0的等差数列 的前n项和,且 成等比数列。(Ⅰ) 求数列 的公比;(Ⅱ) 若 ,求 的通项公式.
英语练习册翻译答案 U 2~3 Unit 21.The manager is always friendly with his inferiors and never yells at them.2.The tourists exchanged some pounds for dollars at a local bank.3.After a short break of ten minutes, they proceeded to the destination.4.The old machine will be replaced with a new one to increase our work efficiency.5.The robber ran off at once and disappeared at the end of the street.6.Is there any possibility that he has changed his mind on second thoughts?7.We haven’t yet settled the question where we are going to spend our summer vacation.8.You may have to undergo disappointments and failures before your succeed.9.It is reported that a number of middle school and college students have volunteered to work for the next Olympic Games.10.Haven’t you realized that his reply is equivalent to a refusal?11.I tried to laugh away her doubts and worries.12.To everyone’s surprise, the witness denied having seen the suspect at the scene of the crime.Unit 31.Turkeys are often associated with Thanksgiving Day.2.In Europe, the color white symbolizes purity, so brides are usually dressed in white.3.The Titanic is thought of as the best film he has directed so far.4.He went to work in Beijing and thus had the chance to visit the Palace Museum.5.The government declared that it would make every effort to stimulate economic growth.6.How the ancient Egyptians built the Pyramids remains unknown.7.It’s true that he has made great contributions to the medical science.8.It’s important that one should stick to his moral values.9.My final decision will depend on your attitude towards study.10.The beauty of West Lake reminded the girl of the scenery back home.11.After the man retired, he moved to the country in the hope of finding some peace and quiet.12.It will make a big difference whether you behave well at an interview.
2/27英语倒装笔记 Inversion 倒 装一.概说 (一)英语基本语序,即基本结构是主谓语序 ----Subject+ modal verb/ auxiliary verb + main verb + other sentence elements;如将某些句子成分移至句首而引起主语和谓语词序的颠倒,则称为倒装。(二)倒装原因 1。语法结构的需要 2。 为了强调(三)分类1.完全倒装 (Complete Inversion) ----整个谓语动词放在主语之前 结构: 提前部分+ 谓语动词+主语2.部分倒装( Partial Inversion) ----靠助动词或情态动词构成倒装 结构: 提前部分+助动词(情态动词等)+主语+主要动词二.完全倒装 (Complete inversion) ---整个谓语部分放在主语前面。一般用于一般现在时和一般过去1.将状语here, there前移, there stands/ lies/ exists/ lives/ appears/ seems/rise/ remainsHere comes the bus. Here are some examples.There goes the bell. There appeared to be only two spelling mistakes in her composition.There remains a still more difficult task for us to finish.2.Now, then 放在句首,动词往往是be, come, go 等Now comes your turn. Then came the order to take off. 3.表示位置,方向的副词up, down, in, out, away, ahead,off 等移至句首--- (sentences beginning with an adverbial expression of place or direction)Away went the visitors. Lower flew the eagle till it caught the rabbit.The driver couldn’t control his car and down came the car. Up went the rocket.A middle-aged lady with an elegant hat came in._______________a middle-aged lady with an elegant hat.My pet kitten rushed out when the door was opened._______________my pet kitten when the door was opened.A large temple stood on top of the mountain.___________________stood a large temple.但在此三种结构中,如主语是人称代词,则不引起倒装Here he comes Aren’t you looking for your bag? Look, here it is. Higher and higher it flew.4. 句首状语为表示地点的介词词组+ be/ lie/ stand/ sit/live….vi+ subject On the back wall hung a huge oil painting. In the centre of the square stands a high monument. They arrived at a farmhouse, in front of which sat a small boy. 5. 作表语的形容词或分词结构位于句首 Seated on the grass are a group of students. Lying about on the floor are books and magazinesGreat and spacious is our beloved motherland. 6. 某些表示祝愿的句子的倒装 May you both be happy. May the New Year bring you all your heart desires. 祝您新的一年心想事成 Long live our motherland.三.部分倒装 (Partial Inversion)--- 将谓语的一部分,如助动词/情态动词移至主语之前,如句子没有助动词,则添加助动词do/does/did,置于主语之前
【NOTICE】要UNIT6 More reading笔记的进来 More reading (SrI A Unit 6)Balancing world dietsWords and Expressions1.balance v. balance world diets ---to consider in relation to something else; compare 权衡,比较 Before deciding to study in a foreign country, you have to balance the advantages against the disadvantages. 权衡在国外学习的利与弊 As human beings turn to a new form of technology, they should balance the advantages against the disadvantages. You should balance the pros and cons before deciding on the right choice.--- to (cause to) to be steady When you learn to ride a bicycle, you must learn to balance (yourself)n.--- keep one’s balance keep…in balancelose one’s balancebreak (restore) the balance 打破 (恢复)。。。平衡the balance of nature there should be a balance between study and play.on balance 总的来说 ---an amount that remains or is left over 余额 adj. balanced a balanced budget a balanced diet2. be different be very / much/ quite/ entirely/ totally different from/ to …in….differ fromthe difference between there is a marked/ noticeable/great/ striking / minor/ slight difference in … between…tell the difference between make much /a difference to sb. 产生差别 It makes no difference to me what choice you will make.3. the article from a magazine about new trends Trend ---a general tendency or direction in the way a situation is changing or developing The rise in students’ absence from morning exercises is an annoying trend facing Mr Xu.学生早操缺席率的上升这种倾向。。。。。 There has been a recent trend among students towards turning to computer for comfort, instead of turning to their teachers and parents. The trend that young people in Asia keep in constant contact with one another through text messages is called Asia’s thumb cluture. ----a fashion or style 时尚,时髦 set a new trend 创造最新流行款式 a trend setter adj. trendy 4. find out 5. weight problems the problems of weight 6. form n. --- way something shows or expresses itselfDifferent schools have different forms of management Any form of exercise is good for us. A bad cold sometimes takes the form of high fever and cough over a period of several days. I will express my appreciation for their help in the form of a letter. ---an official paper with spaces in which to answer questions and give other information fill in/ fill out a form an application form develop , -----to come or being gradually into existence.A new idea began to form in his mind. 想出,产生。。。想法Vapour forms when water is heated/ boils . 形成,成形School helps to form a child’s character. / Team work (Group activities) helps to form a child’s character. 对小孩的性格形成有帮助。We should form a good habit of going to bed and getting up early. 形成人格,养成习惯7. become common as common as common----found or happening often and in many places 常见的 ---- of or belonging to society as a whole, general 共同的,共有的
要Unit6 More Reading 笔记的进来! More reading (SrI A Unit 6)Balancing world dietsWords and Expressions1.balance v. balance world diets ---to consider in relation to something else; compare 权衡,比较 Before deciding to study in a foreign country, you have to balance the advantages against the disadvantages. 权衡在国外学习的利与弊 As human beings turn to a new form of technology, they should balance the advantages against the disadvantages. You should balance the pros and cons before deciding on the right choice.--- to (cause to) to be steady When you learn to ride a bicycle, you must learn to balance (yourself)n.--- keep one’s balance keep…in balancelose one’s balancebreak (restore) the balance 打破 (恢复)。。。平衡the balance of nature there should be a balance between study and play.on balance 总的来说 ---an amount that remains or is left over 余额 adj. balanced a balanced budget a balanced diet2. be different be very / much/ quite/ entirely/ totally different from/ to …in….differ fromthe difference between there is a marked/ noticeable/great/ striking / minor/ slight difference in … between…tell the difference between make much /a difference to sb. 产生差别 It makes no difference to me what choice you will make.3. the article from a magazine about new trends Trend ---a general tendency or direction in the way a situation is changing or developing The rise in students’ absence from morning exercises is an annoying trend facing Mr Xu.学生早操缺席率的上升这种倾向。。。。。 There has been a recent trend among students towards turning to computer for comfort, instead of turning to their teachers and parents. The trend that young people in Asia keep in constant contact with one another through text messages is called Asia’s thumb cluture. ----a fashion or style 时尚,时髦 set a new trend 创造最新流行款式 a trend setter adj. trendy
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