问题详情:已知{an}是等差数列,前n项和为Sn,a1=120,公差d=-4,若Sn≤an(n≥2),则n的最小值为()A.60 B.62 C.70 D.72【回答】B知识点:数列题型:选择题...
2020-09-26 19008
问题详情:完形真空Ann:Hey,Rose!Let’s 1 amovie.Rose:Hm,Idon’tknow…Ann:Well…Let’sgotoseeTheEdge.It’s 2 thriller.Rose:Un,well,I 3 likethrillers.Idon’twanttogo,but 4 .Ann:e’sJames? 5 hewanttogo?Rose:Idon’t 6 .Ann:Hi,James....
2021-03-04 23301
问题详情:已知点An(n,an)为函数y=图象上的点,Bn(n,bn)的函数y=x图象上的点,其中n∈N*,设cn=an-bn,则cn与cn+1的大小关系为________.【回答】cn+1<cn知识点:不等式题型:填空题...
2020-01-09 8053
问题详情:命题“nN*,f(n)N*且f(n)≤n”的否定形式是()A.nN*,f(n)N*且f(n)>n B.nN*,f(n)N*或f(n)>nC.n0N*,f(n0)N*且f(n0)>n0 D.n0N*,f(n0)N*或f(n0)>n0【回答】D知识点:常用逻辑用语题型:选择题...
2020-02-09 18798
1、WewerehostedbymylongtimefriendGovernorAnnRichards,whowasalsoabigsupporterofNAFTA.2、Fromwoodentowinningduringthecampaign,whenitwashardlyacertaintythathewouldbeattheincumbentAnnRichards,hehadfourissues--juvenilejusticereform,tortreform,educationand...
2024-01-03 21883
问题详情: 已知a1=1,an=n(an+1-an)(n∈N*),则数列{an}的通项公式是________.【回答】an=n知识点:数列题型:填空题...
2020-09-06 32465
问题详情:Ann,amotherof3children,isawarm-heartedsocialworkerandshehasdonealottohelppeople 56 Thefamily’sdinnerconversationoftenturnstolocalpoorfamilies,andshe 57 triesherbesttoseek(寻求)helpforthem.Thisyear,Ann 58 thatSantaCla...
2019-09-08 32439
问题详情:给定*A={a1,a2,a3,…,an}(n∈N,n≥3),定义ai+aj(1≤i〈j≤n,i,j∈N)中所有不同值的个数为*A两元素和的容量,用L(A)表示.①若A={2,4,6,8},则L(A)=;②若数列{an}是等差数列,设*A={a1,a2,a3,…,am}(其中m∈N*,m为常数),则L(A)关于m的表达式为【回答】5 2m-3.【解析】①∵2+4=6,2+6=8,2+8=10,4+6=1...
2021-02-13 17412
William,31,AnnArbor,Mich.Countries,pp.180-210.AnnArbor:UniversityofMichiganPress.Soldhereexclusively,itwasengineeredattheToyotaTechnicalCenterinAnnArbor,Michigan.HenowteachesattheUniversityofMichiganLawSchoolinAnnArbor.Zanker,Paul.ThePowerofImagesint...
2018-01-01 27066
问题详情:已知Sn为正项数列{an}的前n项和,且满足Sn=a+an(n∈N*).(1)求a1,a2,a3,a4的值;(2)求数列{an}的通项公式.【回答】解:(1)由Sn=a+an(n∈N*),可得a1=a+a1,解得a1=1;S2=a1+a2=a+a2,解得a2=2;同理a3=3,a4=4.(2)Sn=a+an, ①当n≥2时,Sn-1=a+an-1, ...
2021-02-20 25644
问题详情:已知点An(n,an)为函数y=的图象上的点,Bn(n,bn)为函数y=x图象上的点,其中n∈N*,设cn=an-bn,则cn与cn+1的大小关系为__________.【回答】cn>cn+1知识点:推理与*题型:填空题...
2020-04-12 5796
问题详情:设数列{an}(n∈N*)是公差为d的等差数列,若a2=4,a4=6,则d= ()A.4 B.3 C.2 D.1【回答】D知识点:数列题型:选择题...
2021-04-30 14223
问题详情:已知数列{an}中,a1=2,且=4(an+1-an)(n∈N*),则其前9项和S9=________.【回答】1022知识点:数列题型:填空题...
2019-05-16 8367
1、ANNbasedmusicchordperception2、ThesisconstructsANNmodelstosimulatelandusechangesbytrialanderroroncomparingthemethodsofconstructedANN.3、RESULTS:ANNhaspotentialadvantageovertraditionalmethods,soextensiveapplicationsofANNinclinicalpharmacycanbeexpec...
2024-02-10 8665
问题详情:下列各项中可能不是配子的为()A.abD B.YrS C.BvR D.aNn【回答】解:A、a、b和属于非等位基因,并且基因是成单存在的,属于配子,A错误;B、同A项,Y、r、S基因都是成单存在的,属于配子,B错误;C、同A项,B、v、R基因都是成单存在的,属于配子,C错误;D、N和n属于一对等位基因,而配子是...
2019-09-21 22176
问题详情:1.Annhasbeenherefortwoyears.(改为一般疑问句)Annherefortwoyears?2.Wangwang,alovelydog,diedaweekago.(改为同义句)Wangwang,alovelydog,foroneweek.3.BillhasbeeninChinafortwoweeks.(对画线部分提问)hasBillbeeninChina?4.WehavelivedinBeijingfortwoyears....
2021-06-22 11233
问题详情:完形填空Ann:Hey,Rose!Let’s 1 amovie.Rose:Hm,Idon’tknow…Ann:Well…Let’sgotoseeTheEdge.It’s 2 thriller.Rose:Un,well,I3 likethrillers.Idon’twanttogo,but 4 .Ann:e’sJames? 5 hewanttogo?Rose:Idon’t 6 .Ann:Hi,James. 7 ...
2021-01-02 15742
问题详情: —Ann,_____yousaythiswordinChina? —Yes.Itisveryeasy. A.may B.can C.must D.need 【回答】B知识点:情态动词题型:选择题...
2021-05-20 24123
BriangazedlovinglyatMaryAnn.Henry'srealnamewasMaryAnn.MaryAnnshothimaruefullook.MaryAnnwishedhewouldjustdropit.GeorgeEliotwasthepseudonymofMaryAnnEvans."Hewasalawyerbeforethat,"MaryAnnputin.HenoddedgreetingstoMaryAnnandMichaelandshookhandswithBurk...
2017-02-06 4428
1、AnnMarie,'ThatGirl'.2、Thomas'AnnMariewasatrue'60trendsetter,takingNewYorkbystormwithastylish'do,aclosetfullofmodalamodeanddon'tforgetthoseeyelashes!...
2024-01-03 32987
问题详情:Ann____herhaireveryweek.A.isgoingtowashB.washC.washesD.iswashing【回答】C知识点:动词时态题型:选择题...
2020-02-08 12615
问题详情:某人抛掷一枚硬*,出现正反的概率都是,构造数列{an},使得an=记Sn=a1+a2+…+an(n∈N*),则S4=2的概率为()A. B. C. D.【回答】C解析:依题意得知,“S4=2”表示在连续四次抛掷中恰有三次出现正面,因此“S4=2”的概率为C3·=.知识点:概率题型:选择题...
2021-11-14 11912
问题详情:数列{an}的首项为3,{bn}为等差数列且bn=an+1-an(n∈N).若b3=-2,b10=12,则a8=________.【回答】3知识点:数列题型:填空题...
2022-08-18 9645
问题详情:已知正项等比数列{an}(n∈N*),首项a1=3,前n项和为Sn,且S3+aS5+a5,S4+a4成等差数列.(1)求数列{an}的通项公式;(2)数列{nan}的前n项和为Tn,若对任意正整数n,都有Tn∈[a,b],求b-a的最小值.【回答】 (1)an=3×()n-1.(2)9.试题解析:(1)设等比数列{an}的公比为q,∵S3+aS5+aS4+a4成等差数列,∴有2(S...
2021-01-28 19951
Representativecostonaverage25,000perheadperannum.Priceincreasehasaveraged10%perannumTherentis$2,500perannum.Therentbe$2,500perannum.Priceincreasehaveaverage10%perannum....
2018-04-17 20561