《数列》单元测试题

一、选择题(每小题5分)1.等差数列{an}中,已知a1≠0,S10=4S5,则适合an=9a1的n值是()A.2B.3C.4D.52.在等比数列{an}中,已知a1=1,公比q∈R,且q≠1,an=a1·a2……a10,则n等于()A.44B.45C.46D.473.首项为81,公差为-7的等差数列{an}中,与0最接近的项是()A.a11B.a12C.a13D.无法确定4.{an}为等比数列,且S3=3a3,则公比q值为()A.-12B.12C.1或-12D.-1或125.已知数列{an}是等差数列,a1+a2+a3=15,an+an-1+an-2=78,其前n项和Sn=155,则n=()A.15B.12C.10D.86.在等比数列{an}中,a1+a2+…+a5=3,a6+a7+…+a10=9,则a11+a12+…+a15=()A.27B.36C.40D.…     

2011年中考自测题(二) 数学

A卷(共100分)一、选择题:(每小题3分,共30分)1.--13的倒数是().A.3B.-3C.13D.-312.下列运算中,结果正确的是().A.a4+a4=a8B.a3·a2=a5C.a8÷a2=a4D.(-2a2)3=-6a63.下列命题中错误的命题是().A.平行四边形是中心对称图形B.菱形的对角线互相垂直平分C.近似数3.14×103精确到百分位     

初中英语选择题百例(下)

51.The teacher said to Li Lei,“Be careful,you missed “f’’in word“diferent”.” A.an…the B.a…a C.an…a D.a…the 52.There is——apple on the table.——appleis Tomk. A.an…the B.a…an C.an…The D.the…The 53.There is “u”, “s’’and “e”in theword“use”. A.an,an,an B.a,an,a C.a,an,an【).an,a,an 54.From——space the earth looks very smaU. A.a B.an C.the D./ 5豇——interesting stOry it is! A.What a B.What an C.How D.How an 56.The train will arrive haH hour. A.after…an B.af…     

初二英语Units15—17综合训练题(英文)

Ⅰ.词汇。A:选择恰当的字母完成单词。1. sug___ A. er B. ar C. ur2. lad___ A. ies B. ays C. aying3. h_st_ry A. i, a B. e, o C. i, o4. n__se A. oi B. ui C. ie5. m_st_ke A. e, a B. i, a C. i, e     

冠词考点训练台

【点击考点】 冠词中考热点侧重在不定冠词a(an)的区分;定冠词the的用法;不用冠词场合的考查。 l专题训练l 工.中考选粹1 .This 15—一emPty bottle.Could you give me full one? A.a,a B.an,a C.rhe,the D./,a(2002济南)2 .Mike 15—American boy.He studies In—university in Lanzhou. A.the,a B.a,a C.an,a D.an,an(2002甘肃)3.一Wherels mathsteacher? 一He’stalking with Sam’5 father. A.a B.an C.the D./(2002福州)4.Greens are on visit to a beautifulcity in China. A./,a B.A,the C.The,a D.The,/(加02吉林)5 .…     

中考冠词专练

1 .The seienllsts fror。United StateslivC iflA .the;Ninth Stl℃ettheB./;the C./;/ D.the;/ India and China are of Saflle Cofltlfleflt. A./;the B.The;the C./;/D./;a3 .W己ean’t see_sun on a rainy day. A.a B.theC/D.an4.Greens are on visit to a beantiful city in China. A./;a B.A;the C.The;a D.The;/5 .Mike 15_Ameriean boy.He studies In一university in Lanzhou. A .the;a B.a;a C.an;a D.an;an6.es一What’5 that over there? -It,5 boat. A.a B.an C.theD了7 .This 15—一emPty bottle.Could …     

克服集合问题中的忽视思想

集合相关问题的处理中 ,认真、仔细是我们正确找出答案的一个重要条件 .以下就一些易忽视的情况加以说明 :1　忽视解题后的反思和检验例 1　已知 A ={x|x2 +2 x -8=0 },B = {x|x2 -5 x +6=0 },C={x|x2 -ax +a2 -19=0 },若 A∩ C = ,B∩ C≠ ,求a的值 .错解 :A ={2 ,-4 },B ={2 ,3 }由 A∩ C = ,知 2 C,-4 C又据 B∩ C≠ ,得 3∈ C于是由 3 2 -a . 3 +a2 -19=0 ,得a =-2或 a =5 .分析 :这里由 3∈ C,可以得到 a =-2 ,a= 5 ,但由 a =-2 ,a=5 ,能得出 2 C,-4 C,即 A∩ C≠ 吗 ?只有通过验证才能确定 .正解 :接上解当 a =-2时 ,…     

初一英语第21单元目标检测题(英文)

听力部分(2()分)1.选出你所听到的单词或词组。听一遍。(5分) 1,A .read B.red C .write D.ride 2.A.lake B.skate C .make D.eook 3 .A.eard B.Park C .hard D.basket 4.A.sleeP B.PI叮er C .Pleasure D.elear 5 .A.riee B.fly C .toy D.iee 6.A.take Photos B.talk with C,help with D.play with 7 .A.90 to bed B.fly a kite C .make a eake D.make the bed 8 .A.mend a bike B.read a book C .ride a bike D.borrow a book 9 .A.look at theblaekboard B .look after the ehild C .look for the eoat D .look like Lu…     

关于平面向量的测试题

一、选择题1.下列关系正确的是()A.A =-B B.a·b仍是一个向量C.A -A =C D.｜a·b｜=｜a｜·｜b｜2.若向量a、b反向,则下列等式成立的是()A.｜a｜-｜b｜=｜a-b｜B.｜a+b｜=｜a-b｜C.｜a｜+｜b｜=｜a-b｜D.｜a｜+｜b｜=｜a+b｜3.平面上有三个点C(2,2),M(1,3),N(7,k),若∠MCN=90°,则k的值为()A.6B.7C.8D.94.下列各组中的两个向量,其中共线的一组是()A.a=(-2,3),b=(4,6)B.a=(2,3),b=(3,2)C.a=(1,-2),b=(7,14)D.a=(-3,2),b=(6,-4)5.若｜a｜=3,｜b｜=4,(a+b)(a+3b)=33,则a与b的夹角为()A.30°B.60°C.120°D.150°6.…     

2004年全国高中数学联赛模拟试题

一、选择题 (每小题 6分 ,共 3 6分 )1 .C010 C110 C110 C210 … C910 C1010 等于 (　　 ) .A .C82 0 　　　　　　B .C92 0C .C102 0 　　　D .C152 02 .设 -π2 <α β <π2 ,-π2 <α -β <π2 ,则有(　　 ) .A .sinα >sβ　　　　B .sinα >nβC .cosα >inβ　　　　 D .cosα >cosβ3 .已知 f(x) =x 12 ,x∈ [0 ,12 ) ,2 ( 1 -x) ,x∈ [12 ,1 ].定义 fn(x) =f( fn - 1(x) ) ,则 f2 0 0 4 ( 15 )等于(　　 ) .A .15 　　B .35 　　C .45 　　D .254.数列 {an}满足a1=32 ,an 1=a2 n-an 1 ,则m =1a1 1a2 … 1a2 0 0 4…     

冠词专练(英文)

1. Wouldn1t it be wonderful world if all nations lived in peace with one another? A. a,× B. the,× C. a,the D. the,theA S c h o o l G a r d e n O f E n g l i s h 中 学 英 语 园 地 2 0 0 7 . 7 - 8 2. Mum was sitting on chair near door when I came back. A. the,a B. a,a C. a,the D. the,the 3. Xi相似文献   

试试你的功力

Ⅰ.单词拼写。选出正确的字母或字母组合补全下列单词。使其完整与正确。1.__xc__seA.e,u B.i,u C.u,e D.a,u2.fr__ndA.ei B.ai C.ie D.ir3.r___tA.egh B.eir C.are D.igh4.w__lc__meA.o,e B.a,o C.e,o D.o,a5.m__tA.ei B.ee C.ie D.aeⅡ.选择填空1.It's a cat.____name is Mimi.A.He B.She C.It D.Its2.This is Wang Ming.I think____     

大学英语语法、结构试题集锦

1. Scientists have studied the Mars through telescopes for many years so we know_facts about it now.A. a good many B. a many of C. many a D. a many2. Alone in a deserted house,he was so busy with his experiment that he felt_lonely.A. nothing but B. anything but C. all but D. everything but3. While admitting that this forecast was_uncertain, the scientists warned against treating it as a cry wolf.A. anyhow B. somewhere C. somewhat D. anyway     

高一数学专题复习月考卷(二)——平面向量(一)

一、选择题(本大题共12个小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的.)1.已知a=6!3,b=1,a·b=-9,则a与b的夹角是()A.150°B.120°C.60°D.30°2.已知向量a、b,且A"#B=a 2b,"B$C=-5a 6a,"C$D=7a-2b,则一定共线的三点是()A.A、B、D B.A、B、C C.B、C、D D.A、C、D3.如果向量a与b的夹角为θ,那么我们称a×b为向量a与b的“向量积”,a×b是一个向量,它的长度为a×b=a b sinθ.如果a=13,b=1,a·b=-5,则a×b=()A.5B.-8C.8D.124.已知三个力f1=(-2,-1),f2=(-3,2),f3=(4,-3),同时作用于某物体上一点,为使…     

2002年英语中考模拟试题

第一巷选择题I.单项选择题。1.We can’t see____sun at__night. A.a;不填 B.a;the C.the;(不填)D.the;the2.Uncle Wang is______. A.a friend of my father B.my father's friend C.one of my father's D.a friend of my father's3.Bob didn’t know_____ to write about. A.what B.how C.that C.whose     

初三英语Units13—15

听力测试I. 听句子,选择恰当的应答语1. A. Only once a monthB. In time.C. For one year. 2. A. It’s nothing serious.B. Yes, a little better, thanks. C. I’ve got a headache. 3. A. I’m glad to hear that.B. What a pity! C. Have a good time! 4. A. Thanks. B. Is that enough? C. It doesn’t matter. 5. A. Can I help you? B. Wait! Can’t you see I'm busy? C. Go straight along here,please. II. 听句子,选出与所听句子意思最…     

英语期中测试题

.单项选择。从A、B、C、O四个选项中,选出可以填入空白处的正确答案。1 .Can”u tell me the answer_the question? A .of B.to C.about D./2·He hao two danghters.One 15 a soldier,_15 a worker· A .another B.a other C.the other D.others3._fine day it 15! A .How B.How a C.What D.取厂hata4.1’m hungry.1 want_. A.something eating B.something to eat C .eat something D.to eating something5 .There_a new film this evening. A.15 going to have B.15 going to be C.have D.has6.Why not_and have a look at …     

高考数学专题复习样卷(一)——数列

一、选择题(本大题共12小题,每小题5分,共60分,在每小题给出的四个选项中,只有一项是符合题目要线求的.)1.已知数列{an}满足an 2 an=2an 1,且a7 a9=16,a4=1,则a12的值为()A.15B.30C.31D.642.等比数列{an}中,a1=1,a10=3,则a1·a2·…·a10等于()A.35B.3253C.323D.373.已知等差数列{an}的前n项和为Sn,若S101=0,则有()A.a1 a101>0B.a2 a100<0C.a3 a99=0D.a51=51     

“代数式”测试卷

【慧眼识金】1．下面各式中,不是代数式的是（）．A．3a＋b B．3a=2b C．8a D．02．以下代数式书写规范的是（）． A．（a＋b）÷2 B．6/5 C.1 1/3x D.x＋y厘米 3．计算：-5a2＋4a2的结果为（ ）．A．-3a B．-a C．-3a2 D.-a2     

03年山东省初中数学竞赛试题(初二、初三)

1.如果a,b,C是非零实数,且a b C=0,那么的所有可能的值为( ) (A)0.(B)1或-1.(C)2或-2.(D)0或-2. 2.如果自然数a是一个完全平方数,那么与a之差最小且比a大的一个完全平方数是( )