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已知等差数列{an}中，若a3＝﹣9，a4+a10＝﹣2，则Sn取最小值时的n＝（ ）
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高一下学期数学《》真题及答案
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从{12345678910}中任选3个不同的数使它们成等差数列则这样的等差数列最多有个.
我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个数与
已知等差数列{an}满足a4＝6a6＝10.1求数列{an}的通项公式2设等比数列{bn}的各项均为
我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个数与
设等差数列{an}的前n项和为Sn若a1=﹣11a4+a6=﹣6则a3等于
16
37
-7
9
已知{an}为等差数列若a3+a4+a8=9则a5=
3
4
5
6
在等差数列{an}中已知a1=2a2+a3=13则S9等于
14
26
126
162
已知则数列是
公差为9的等差数列
公差为
的等差数列
公差为4 的等差数列
不是等差数列
已知公差不为0的正项等差数列｛an｝中Sn为前n项之和lga1lga2lga4成等差数列若a5=10
已知等差数列{an}的公差为3若a1a3a4成等比数列则a2等于
9
3
－3
－9
本小题满分12分已知数列其中是首项为1公差为1的等差数列是公差为的等差数列是公差为的等差数列.1若求
阅读我们把按照一定顺序排列的一列数称为数列如1391933就是一个数列如果一个数列从第二个数起每一个
由公差为d的等差数列a1a2a3重新组成的数列a1+a4a2+a5a3+a6是
公差为d的等差数列
公差为2d的等差数列
公差为3d的等差数列
非等差数列
已知136的各项是一个等比数列和一个等差数列对应项相加而得到的其中等差数列的首项为0.Ⅰ分别求出等差
在等差数列{an}中若a2＋a3＝4a4＋a5＝6则a9＋a10＝
9
10
11
12
已知136的各项是一个等比数列和一个等差数列对应项相加而得到的其中等差数列的首项为0.Ⅰ分别求出等差
在公差为d的等差数列{an}中已知a1=10且a12a2+25a3成等比数列.1求dan;2若d
在等差数列{an}中若a3=50a5=30则a7=.
等差数列中若a3+a4+a5+a6+a7+a8+a9=420则a2+a10=
100
120
140
160
已知一等差数列a121a331an若an=516则该数列前n项的平均数是
266
258
255
212
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假定你是李华最近你要为你们学校的英文报写一篇关于中欧友好日暨中欧环保小使者活动走进欧盟学校的新闻报道. 内容要点 1.中国学生表演了武术书法气功等中国特色项目 2.欧洲学生上演了有关环保的戏剧节目 3.活动的意义. 注意 1.词数100左右开头已写好不计入总词数 2.可以适当添加细节以使行文连贯.参考词汇武术martialarts气功Qigong OntheChina﹣EuropeFriendshipDaymanyChinesestudentsandtheirEuropeanfriendsgottogetherataEU'smiddleschool..
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HowSuperAreSupermarkets? Buyingeweek'sgroceriesistiring.Youwanttogetitoveranddonewithquicklysoyouheadforthenearestsupermarketyoufindeverythingyouneedunderoneroofandyoufeelgladthatthosedaysofgoinginandoutofdifferentshopsinthehighstreetareover.Supermarketsseemtobeabigplus.Thereisadownsidethough. IntheUK90%ofallthefoodpeopleconsumeisboughtat5differentsupermarketchains.Thismakesthesecompaniesextremelypowerfulwhichletsthemusetheirhugebuyingpowertosqueezesmallsupplierstogetthebestdeal.Milkisagoodexample.Supermarketsliketousethingslikemilkwhichisthetopofalmosteveryone'sshoppinglisttoattractcustomers.Toofferthelowestpricepossibletotheconsumerthesupermarketsforcedairyfarmerstosellmilkatlessthanthecostofproduction.Supermarketsguaranteetheirgoodprofitswhilefarmersareleftstrugglingtomakeendsmeetandthetaxpayerpaystosupportthesystemwithoutevenknowingit. Itwouldbeniceiflocalgrocerssupportedlocalagriculture.Butforthebigsupermarketsthisjustdoesn'tmakesense.Supermarketsdon'twantlittlefarmersthinkingtheycandecideprices.Sosupermarketshavestartedaglobalsearchforthecheapestpossibleagriculturalproduce.Inmanysupermarketsitisdifficulttofindanythingwhichisproducedlocally. UKfarmersusedtogrowalotofapples.Notanymore.In199936%ofappleswereimported.By2015thefigurehadrisento80%andthedomesticproductionofappleshadfallenbytwothirds.TheconsumermightjustbehappytogetareasonablypricedmealmadeupoffoodsfromThailandSpainItalyandZambiabutweshouldalsobearinmindtheInfluenceonlocalproducers. Thenthere'spackaging.Supermarketslikeeverythingtobepackedandwrappedsoitcanbepiledneatlyonshelves.Supermarketsproducenearly10milliontonsofwastepackagingintheUKeveryyearofwhichless5%isrecycled.Somesupermarketsmakesurethatlargerecyclingbinsareobviousintheircarparksshowingthattheyareenvironment﹣friendly.Butthatisjustanimage. Whenanewsupermarketisplannedthereareclaimsaboutthenumberofnewjobsthatwillbecreated.Unfortunatelythenumberofjobslostintheareaislargerthanthenumberofnewpositionsinthesupermarket.Onaverageeachnewsupermarketleadstothelossof276jobs. Howeverthemodernworldisallaboutshoppingandthefreedomtobuywhateveryouwhatsoitwouldbeimpossibletostoppeopleshoppingatsomeparticularkindofshop.Butsomemeasuresdoneedtobetakenwhensmallsuppliersloseprofitslocalproducerssuffersealevelsriseandjobsarelostanywaywecan'tjustcareaboutafreecarparkandspecialoffers. 1Theauthormentionsmilkinparagraph2toexplainhowsupermarkets. A.cheatthetaxpayers B.supportlocaldairyfarmer C.harmsmallsuppliers‘benefits D.providecustomerswiththecheapestproduct 2Accordingtothepassagesupermarketskeeppriceadvantageby. A.competingagainsteachother B.importingforeignproducts C.purchasinglocalproducts D.reducingproducttax 3Whichofthefollowingshowsthestructureofthepassage? CPCentralPointPPointSPSub﹣pointCConclusion 4Whatistheauthor'sattitudetowardssupermarkets? A.Critical B.Sympathetic C.Doubtful D.Cautious
—Wouldyoulikeicecreamsir? —Yesplease. A.some B.much C.many
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. LastSundayitwasmyfather'sfunnyday.Aftersuppermyfatherwenttoseethefilm.Butinoursurprisehecamebackjustabouthalfanhourlater.Iaskedhimwhatwasthematter.Hesmiledandtoldusaboutthefunnythingwhathadhappenedinthecinema.Hewassittinginhisseatwhileawomancametoherandsaidtheseatwashers.Surprisingtheylookedattheirticketcarefullyonlytofindtheseatsshownintheirticketswerethesamewhilethecolorsweredifferent.Sotheylookedattheticketsmorecarefully.AfterawhilemyfatherapologizedthewomansayingSorryImakeamistake.Takethisseatplease.Thefactwasthathisticketfoundoutinhisdeskdrawerwasforthefilmamonthago.
Don'tbringfoodtotheparty.IfyouI'lltakeitaway. A.are B.willdo C.do
—shoeswouldyoulike?—Size40.A.What B.Whatkindof C.Whatsize
GeneticallyModifiedGMfoodisunfortunatelybecomingmorepopularamongstfarmersandfoodprocessors.Cropsarebeinggeneticallymodifiedtoresistinsectsplantdiseasesinsecticides杀虫剂.Plantsarealsomodifiedtolookbiggerandbetter.Unfortunatelytheendgoalisn'tprovidingnutritionforpeopleit'stoincreaseprofitmarginsandtomakefoodlookbetter.Infactmanymodernfruitsandvegetablesaretwicethesizeofwhattheyusedtobewhilehavingfarlessvitaminsandnottastinggoodeither.Nowresearchisshowingthatgeneticallymodifiedfoodmightevenbebadforyou. GMorganismsareorganismsthathavegenesinsertedintotheirDNAinordertooffercertaincharacteristics.Inthiswayyoucanmakeitbetterormakeitlastlonger. JeffreyM.SmithhaspublishedastudyaboutthedangersofGMfood.ItwasdiscoveredthatwhenGMsoywasfedtofemaleratstheyfoundthatalltheiryoungdiedwithin3weekscomparedtoanatural10%deathrate.Theiryoungwerealsobornsmallerandtheylaterhadproblemsbecomingpregnant.Astudyofpigsfoundthattheyalsobecameinfertile不育aftereatingGMcorn. ManypeopleareeatingGMfoodwithoutevenrealizingit.Thesolutiontothisproblemissimple.Humanbeingsexistedintheircurrentformforhundredsofthousandsofyears.Formostofthattimeweateadietconsistingofmeatfruitvegetablefisheggsandnuts.Thisisouroptimaldietwhichleadsustoliveahealthyandlonglife.Butoverthelast30yearsNorthAmericahasexperienceddiabetescancerandheartdisease.AllduetothemisinformationprovidedbygroupswhoworkonbehalfofthemanufacturersofGMfood.Thewaytoavoidobesityheartdiseaseandcancerisbyeatinglikeourstone﹣ageancestors. 1AccordingtotheauthorwhatultimatelyinspiredthepopularityofGMcrops?C A.Richnutrition. B.Uniquetaste. C.Highprofits. D.Energysaving 2Whathadwebetterdoifwewanttostayhealthyaccordingtothetext?D A.Eatmorefruit. B.Bevegetarians. C.Eatmoregrains. D.Keeptraditionaldiet. 3ThetextisorganizedintheformofB. A.timeandevents B.causeandeffect C.reasoningandargument D.contrastandcomparison 4WecaninferthatthelobbygroupsinParagraph4arepeoplewhoareC. A.scientistswhogiveoutfalseinformationbecauseofcarelessness B.doctorswhotrytoprofitfrompatientswhosufferfromunhealthyfood C.workerswhotrytocheatcustomersforthebenefitsoffoodproducers D.agriculturaltechnicianswhoareresponsibleforpromotingnewproduct
Iwouldtogotoseethemoviethisafternoon.
Hewillgototheparkifheistomorrow.
Thereare12inthecakeyoucanblowthemoutinonego.
Asanyonewhofreelances做自由职业knowstherearelotsofadvantagesofworkingathomealone.Buttherearedrawbackstoolikethepotentialloneliness.Nowonderco﹣workingspacesarebecomingsopopulartheypermitself﹣employedindividualstofeelliketheyarepartofallofficeenvironmentwhilemakingthemgetsomeworkdonetoo.Butrentingaco﹣workingspacedoescostmoney. NowaSwedishprojectisaimingtochangethatbyturningpeople'sunder﹣usedhomesintotemporaryco﹣workingspacesavailabletofreelancersforfree.HofficewasstartedbyfreelancersChristoferGradinFranzenandJohlineZandraaboutayearagoinStockholmwhentheyinvitedafewpeopleintotheirhomeofficetoworktogether.ItwasagreatsuccessandtheprojecthassincespreadtoanumberofcitiesinEuropeNorthandSouthAmericaAustraliaIndiaandJapan.Anyonecansignupandoffertheirhomespaceasafreeco﹣workingspaceorgofindaHofficenearthem. OnaHofficedayeveryonearrivesandstartsworkatacertainhour.After45minuteseveryonegetsuptotakeabreakstretchdoqigongoryogafor10to15minutes.Afterwardspeoplecangatheraroundagainandre﹣statetheirintentionsandgoalsfortherestoftheworkdayasawaytomotivateeachother.Mealscanbeeatentogetheratacertainhourpotluck﹣style家常饭orbybringingyourownlunch. Thisprocesscreatesanencouragingandsupportiveworkenvironment.AssomefreelancersdescribeByworkingatHofficewegiveourselvesandeachotherthegifttospendourdaysinasocialworkingenvironmentwhereweareextremelyproductivewithoutignoringourotherhumanneeds.Wealsomakesuretogiveusandeachotherwhatweneedtofeelcalmhappyinspiredandcreativeduringtheworkingday. SoHofficeisnotjustaboutsharingspaceit'salsoaboutafreeexchangeofideas.AndperhapsthebestthingisthatHofficesarefreetouse. 1Hofficewasstartedto. A.changepeople'sattitudetowork B.encouragepeopletobemoresocial C.improvepeople'sworkingconditions D.provideaco﹣workingspaceforfree 2What'sthemainideaofParagraph3? A.HowpeoplerespondtoHoffice. B.HowaHofficedayworks. C.WhatpeopleshareatHoffice. D.WhatHofficemeanstopeople. 3Somefreelancers'descriptionsofHofficesuggestthatthey. A.benefitalotfromtheworkingstyle B.worklongerthanbefore C.expectmorepeopletojointhem D.can'tbeseparatedfromeachother 4WhatdoweknowaboutHofficeaccordingtothetext? A.Itisbecomingincreasinglypopular. B.Ithasbeenaroundforquiteafewyears. C.Ithascreatedmanynewjobopportunities. D.Itissuitableforpeoplefromallwalksoflife.
Iofteneatsomeandforlunch.A.tomato;fish B.tomatoes;fish C.tomato;fishes
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的等差数列 公差为4 的等差数列 不是等差数列
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