2015第一次作业150610

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2015年级数学第一次月考测试卷

2015年级数学第一次月考测试卷

中卫六小2014—2015学年度第二学期第一次质量测查小学六年级数学试卷(时间100分钟)(21分) 、在数轴上,-3在0.5的( ),它们的大小比较是( )。

、6.04立方米=( )立方米( )立方分米3.6平方米=( )平方分米 5立方分米30立方厘米=( )立方分米=( )升。

、一个圆锥的底面积是2.4平方分米,高是6分米,它的体积是( )立方分米。

和它等底等高的圆柱的体积是()立方分米。

、一段3米长的圆柱体木料,截成3段后,表面积增加了60平方分米,这段木料原来的体积是( )立方分米。

、15÷( )= 30(...)= 53=( ):( )=( )%=( )折=( )成。

、把一个圆柱削成一个最大的圆锥,正好削去了45dm 3,这个圆柱的体积是( )dm3、两个底面积相等的圆柱,一个的高是4.5dm,体积是81dm3,另一个的高是5dm ,体积是( )dm 3 、一个圆柱的侧面积是是18.84dm 2,高3dm,它的底面积是( )dm 3,表面积是( )dm 2,体积是( )dm 3。

、商场服装打八折,现价比原价降低了( );今年小麦比去年增产两成,今年小麦产量是去年的( )。

、在-7、0.2、+3.7、0、-0.3、+1.6中、正数有( ),负数有( ), 按从大到小的顺序排列 。

、一个圆锥的底面半径是3米,体积是18.84平方米,它的高是( )立方分米。

和它等底等高的圆柱的体积是( )立方分米。

、一件衣服打八折售价480元,这件衣服原价( )元。

中卫饭店十月份的营业额是450元,按6%的税率缴纳营业税,应缴纳( )元。

、一个圆柱和一个圆锥等底等高,它们的体积和是36立方米,那么圆锥的体积是)立方米,圆柱的体积是( )立方米。

、把一个棱长4分米的正方体削成一个最大的圆柱,圆柱的体积是( )立方分米。

、一个圆柱体的底面周长是18.84分米,高10分米,这个圆柱的侧面积是( )平方分米,表面积是( )平方分米,体积是( )立方分米。

2015级上期人教版第一次定时作业

2015级上期人教版第一次定时作业

《重庆名校联盟月考卷》2015级(上)英语(人教)第一次试题(满分150分, 考试时间120分钟)第I卷(100分)I. 听力测试。

(共30分)第一节(每小题1.5分,共9分)听一遍,根据你所听到的句子,从A、B、C三个选项中选出最恰当的答语,并把答题卡上对应题目的答案标号涂黑。

1. A. By bike. B. In the classroom. C. By listening to tapes.2. A. I forgot to bring my pen. B. I forgot to answer the question.C. I had no money to buy a pencil case.3. A. I do, too. B. By reading aloud. C. That’s a great idea.4. A. No, I went straight home. B. Yes, I’d love to. C. It’s all right.5. A. That’s right. B. That’s all right. C. Great idea.6. A. He was playing the piano. B. He hurt his leg. C. He is kind.第二节(每小题1.5分,共9分)听一遍,根据你所听到的对话和问题,从A、B、C三个选项中选出正确答案,并把答题卡上对应题目的答案标号涂黑。

7. A. by listening to tapes. B. by watching English movies.C. by practicing conversations with friends.8. A. He used to be short. B. No, he didn’t. C. Yes, he did.9. A. Memorizing words. B. Studying grammar. C. Practicing conversations.10. A. He agrees. B. He disagrees. C. He doesn’t mind.11. A. Because she couldn’t follow the teacher.B. Because she did badly in the math test.C. Because she will take part in an English test.12. A. The air is nicer. B. The water is cleaner. C. The traffic is better.第三节(每小题1.5分,共6分)听两遍,根据你所听到的对话内容,从A、B、C三个选项中选出正确答案,并把答题卡上对应该题目的答案标号涂黑。

广东省肇庆市2015届高三10月第一次统一检测试题 数学文 Word版含答案

广东省肇庆市2015届高三10月第一次统一检测试题 数学文 Word版含答案

肇庆市2015届高中毕业班第一次统一检测题数 学(文科)本试卷共4页,20小题,满分150分. 考试用时120分钟.注意事项:1. 答卷前,考生务必用黑色字迹的钢笔或签字笔,将自己所在县(市、区)、姓名、试室号、座位号填写在答题卷上对应位置,再用2B 铅笔将准考证号涂黑.2. 选择题每小题选出答案后,用2B 铅笔把答题卷上对应题目的答案标号涂黑;如需要改动,用橡皮擦干净后,再选涂其它答案,答案不能写在试卷上或草稿纸上.3. 非选择题必须用黑色字迹的钢笔或签字笔作答,答案必须写在答题卷各题目指定区域内相应的位置上;如需改动,先划掉原来的答案,然后再写上新的答案;不准使用铅笔和涂改液. 不按以上要求作答的答案无效. 参考公式:锥体的体积公式13V Sh =,其中S 为锥体的底面积,h 为锥体的高. 球的表面积公式24R S π=,其中R 为球的半径.线性回归方程a x b yˆˆˆ+=中系数计算公式∑∑==---=ni ini i ix xy y x xb 121)())((ˆ,x b y aˆˆ-=,其中x ,y 表示样本均值.一、选择题:本大题共10小题,每小题5分,满分50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.已知全集U ={1,2,3,4,5,6},集合M ={1,3,5},则=M C UA .φB .{1,3,5}C .{2,4,6}D .{1,2,3,4,5,6}2.设条件p :0≥a ;条件q :02≥+a a ,那么p 是q 的A .充分条件B .必要条件C .充要条件D .非充分非必要条件3.=+-ii131 A .i 21+ B .i 21+- C .i 21- D .i 21--4.设集合}2,1,0{=M ,}023|{2≤+-=x x x N ,则=N MA .{1}B .{2}C .{0,1}D .{1,2}5.设,,是非零向量,已知命题p :若0=⋅,0=⋅,则0=⋅;命题q :若//,//,则//. 则下列命题中真命题是A .q p ∧B .q p ∨C .)()(q p ⌝∧⌝D .)(q p ⌝∨ 6.设l 为直线,α,β是两个不同的平面,下列命题中正确的是A .若l //α,l //β,则α//βB .若α//β,l //α,则l //βC .若l ⊥α,l //β,则α⊥βD .若α⊥β,l //α,则l ⊥β 7.设D ,E ,F 分别为∆ABC 的三边BC ,CA ,AB 的中点,则=+FC EBA .BCB .ADC .BC 21 D .AD 21 8.执行如图所示的程序框图输出的结果是A .55B .65C .78D .899.一个几何体的三视图如图所示,恒谦其中正视图和侧是腰长为1的两个全等的等腰直角三角形,则该几何体的外接球的表面积为A.π312 B .π12 C .π34 D .π310.设a ,b 为非零向量,||2||a b =,两组向量4321,,,x x x x 和4321,,,y y y y 均由2个a 和2个b 排列而成. 若44332211y x y x y x y x ⋅+⋅+⋅+⋅所有可能取值中的最小值为2||4a ,则a 与b 的夹角为 A .32π B .2π C .3π D .6π 二、填空题:本大题共4小题,每小题5分,满分20分. 11.已知)2,1(=a ,),4(k b =,若b a ⊥,则=k ▲ .12.若复数i a a a )2()23(2-++-是纯虚数,则实数a 的值为 ▲ .13.若0>a ,0>b ,且ab ba =+11,则33b a +的最小值为 ▲ . 14.(几何证明选讲)如图,点P 为圆O 的弦AB 上的一点,连接PO ,过点P 作PC ⊥OP ,且PC 交圆O 于C . 若AP =4,PC =2,则PB = ▲ .三、解答题:本大题共6小题,满分80分. 程和演算步骤.15.(本小题满分12分)某工厂的A 、B 、C 三个不同车间生产同一产品的数量(单位:件)如下表所示. 质检人员用分层抽样的方法从这些产品中共抽取6件样品进行检测.正视图侧视图俯视图(1)求这6件样品中来自A 、B 、C 各车间产品的数量;(2)若在这6件样品中随机抽取2件进行进一步检测,求这2件商品来自相同车间的概率.16.(本小题满分12分)如图,已知PA ⊥⊙O 所在的平面,AB 是⊙O 的直径,AB =2,C 是⊙O 上一点,且AC =BC =PA ,E 是PC 的中点,F 是PB 的中点.(1)求证:EF //平面ABC ; (2)求证:EF ⊥平面PAC ; (3)求三棱锥B —PAC 的体积.17.(本小题满分14分)为了解篮球爱好者小李的投篮命中率与打篮球时间之间的关系,下表记录了小李某月1号到5号每天打篮球时间x (单位:小时)与当天投篮命中率y 之间的关系:(1)求小李这5天的平均投篮命中率;(2)用线性回归分析的方法,预测小李该月6号打6小时篮球的投篮命中率.18.(本小题满分14分)某家电生产企业根据市场调查分析,决定调整新产品生产方案,准备每周(按40个工时PA计算)生产空调器、彩电、冰箱共120台,且冰箱至少生产20台. 已知生产这些家电产品每台所需工时和每台产值如下表:问每周应生产空调器、彩电、冰箱各多少台,才能使产值最高?最高产值是多少?(以千元为单位)19.(本小题满分14分)如图,四棱柱1111D C B A ABCD -中,A A 1⊥底面ABCD ,且41=A A . 梯形ABCD 的面积为6,且AD //BC ,AD =2BC ,AB =2. 平面DCE A 1与B B 1交于点E .(1)证明:EC //D A 1;(2)求点C 到平面11A ABB 的距离.20.(本小题满分14分)设a 为常数,且1<a .(1)解关于x 的不等式1)1(2>--x a a ;(2)解关于x 的不等式组⎩⎨⎧≤≤>++-1006)1(322x a x a x .ABCDEA 1B 1C 1D 1肇庆市2015届高中毕业班第一次统测 数学(文科)参考答案及评分标准一、选择题二、填空题11.-2 12.1 13.24 14.1三、解答题15.(本小题满分12分)解:(1)因为样本容量与总体中的个体数的比是501100150506=++,(2分)所以A 车间产品被选取的件数为150150=⨯, (3分) B 车间产品被选取的件数为3501150=⨯, (4分) C 车间产品被选取的件数为2501100=⨯. (5分) (2)设6件来自A 、B 、C 三个车间的样品分别为:A ;B 1,B 2,B 3;C 1,C 2.则从6件样品中抽取的这2件产品构成的所有基本事件为:(A ,B 1),(A ,B 2),(A ,B 3),(A ,C 1),(A ,C 2),(B 1,B 2),(B 1,B 3),(B 1,C 1),(B 1,C 2),(B 2,B 3),(B 2,C 1),(B 2,C 2),(B 3,C 1),(B 3,C 2),(C 1,C 2),共15个. (8分)每个样品被抽到的机会均等,因此这些基本事件的出现是等可能的. 记事件D :“抽取的这2件产品来自相同车间”,则事件D 包含的基本事件有:(B 1,B 2),(B 1,B 3),(B 2,B 3),(C 1,C 2),共4个. (10分) 所以154)(=D P ,即这2件产品来自相同车间的概率为154. (12分)16.(本小题满分12分)证明:(1)在∆PBC 中,E 是PC 的中点,F 是PB 的中点,所以EF //BC . (2分) 又BC ⊂平面ABC ,EF ⊄平面ABC ,所以EF //平面ABC . (4分) (2)因为PA ⊥平面ABC ,BC ⊂平面ABC ,所以PA ⊥BC . (5分) 因为AB 是⊙O 的直径,所以BC ⊥AC . (6分) 又PA ∩AC =A ,所以BC ⊥平面PAC . (7分) 由(1)知EF //BC ,所以EF ⊥平面PAC . (8分) (3)解:在Rt ∆ABC 中,AB =2,AC =BC ,所以2==BC AC . (9分)所以2=PA .因为PA ⊥平面ABC ,AC ⊂平面ABC ,所以PA ⊥AC . 所以121=⋅=∆AC PA S PAC . (10分) 由(2)知BC ⊥平面PAC ,所以3231=⋅=∆-BC S V PAC PAC B . (12分)17.(本小题满分14分)证明:(1)小李这5天的平均投篮命中率为5.054.06.06.05.04.0=++++=y . (5分)(2)小李这5天打篮球的平均时间3554321=++++=x (小时) (6分) 01.0210)1()2()1.0(21.011.000)1()1.0()2()())((ˆ22222121=+++-+--⨯+⨯+⨯+⨯-+-⨯-=---=∑∑==ni ini i ix xy y x xb(8分)47.0301.05.0ˆˆ=⨯-=-=x b y a(10分) 所以47.001.0ˆˆˆ+=+=x a x b y(11分) PA B当x =6时,53.0ˆ=y,故预测小李该月6号打6小时篮球的投篮命中率为0.53. (14分)18.(本小题满分14分)解:设每周生产空调器x 台、彩电y 台,则生产冰箱y x --120台,产值为z 千元, 则依题意得2402)120(234++=--++=y x y x y x z , (4分)且x ,y 满足⎪⎪⎪⎩⎪⎪⎪⎨⎧≥≥≥--≤--++.0,0,20120,40)120(413121y x y x y x y x 即⎪⎪⎩⎪⎪⎨⎧≥≥≤+≤+.0,0,100,1203y x y x y x (8分)可行域如图所示. (10分)解方程组⎩⎨⎧=+=+,100,1203y x y x 得⎩⎨⎧==.90,10y x 即M (10,90).(11分) 让目标函数表示的直线z y x =++2402在可行域上平移,可得2402++=y x z 在M (10,90)处取得最大值,且35024090102max =++⨯=z (千元). (13分)答:每周应生产空调器10台,彩电90台,冰箱20台,才能使产值最高,最高产值是350千元. (14分)19.(本小题满分14分)(1)证明:因为1//AA BE ,D AA AA 11平面⊂,D AA BE 1平面⊄,所以D AA BE 1//平面. (1分)因为AD BC //,D AA AD 1平面⊂,D AA BC 1平面⊄,所以D AA BC 1//平面. (2分)又B BC BE = ,BCE BE 平面⊂,BCE BC 平面⊂,所以1//ADA BCE 平面平面. (4分)ABCDEA 1B 1C 1D1又EC BCE DCE A =平面平面 1,D A AD A DCE A 111=平面平面 , 所以EC //D A 1. (6分) (2)解法一:因为6=ABCD S 梯形,BC //AD ,AD =2BC , 所以23121===∆∆ABCD ACD ABC S S S 梯形. (9分) 因为A A 1⊥底面ABCD ,ABCD AB 底面⊂,所以AB A A ⊥1. 所以42111=⋅=∆AB A A S AB A . (10分) 设点C 到平面11A ABB 的距离为h ,因为ABC A AB A C V V --=11, (12分) 所以ABC AB A S A A S h ∆∆⋅=⋅131311, (13分) 所以h =2,即点C 到平面11A ABB 的距离为2. (14分) 解法二:如图,在平面ABC 中,作AB CF ⊥于F . (7分) 因为A A 1⊥底面ABCD ,ABCD CF 底面⊂,所以A A CF 1⊥. (8分) 又A AB A A = 1,所以11ABB A CF 面⊥. (9分) 即线段CF 的长为点C 到平面11A ABB 的距离. 因为6=ABCD S 梯形,BC //AD ,AD =2BC , 所以23121===∆∆ABCD ACD ABC S S S 梯形 (12分) 又CF AB S ABC ⋅=∆21, (13分) 所以CF =2,即点C 到平面11A ABB 的距离为2. (14分)20.(本小题满分14分)解:(1)令012=--a a ,解得02511<-=a ,12512>+=a . (1分) ①当251-<a 时,解原不等式,得112-->a a x ,即其解集为}11|{2-->a a x x ; ABCDEA 1B 1C 1D 1F(2分) ②当251-=a 时,解原不等式,得无解,即其解集为φ ; (3分) ③当1251<<-a 时,解原不等式,得112--<a a x ,即其解集为}11|{2--<a a x x . (4分) (2)依06)1(322>++-a x a x (*),令06)1(322=++-a x a x (**), 可得)3)(13(348)1(92--=-+=∆a a a a . (5分) ①当131<<a 时,0<∆,此时方程(**)无解,解不等式(*),得R x ∈,故原不等式组的解集为}10|{≤≤x x ; (6分) ②当31=a 时,0=∆, 此时方程(**)有两个相等的实根14)1(321=+==a x x ,解不等式(*),得1≠x ,故原不等式组的解集为}10|{<≤x x ; (7分)③当31<a 时,0>∆,此时方程(**)有两个不等的实根4)3)(13(3333---+=a a a x ,4)3)(13(3334--++=a a a x ,且43x x <,解不等式(*),得3x x <或4x x >.(8分)1431334)248()31(334)3)(13(33324=-++>-+-++=--++=a a a a a a a a x ,(9分)14334)3)(13(3333<+<---+=aa a a x , (10分)且a a a a a a a a a x 24)53(33416)53(334)3)(13(333223=--+≥---+=---+=,(11分) 所以当0>a ,可得03>x ;又当03>x ,可得0>a ,故003>⇔>a x ,(12分)所以ⅰ)当310<<a 时,原不等式组的解集为}4)3)(13(3330|{---+<≤a a a x x ; (13分) ⅱ)当0≤a 时,原不等式组的解集为φ . (14分) 综上,当0≤a 时,原不等式组的解集为φ ;当310<<a 时,原不等式组的解集为}4)3)(13(3330|{---+<≤a a a x x ;当31=a 时,原不等式组的解集为}10|{<≤x x ;当131<<a 时,原不等式组的解集为}10|{≤≤x x .。

2015年中考第一次模拟考试数学试卷附答案

2015年中考第一次模拟考试数学试卷附答案

九年级数学试卷 第1页(共 10 页)2015年中考第一次模拟考试数学试卷注意事项:1.本试卷共6页.全卷满分120分.考试时间为120分钟.考生答题全部答在答题卡上,答在本试卷上无效.2.请认真核对监考教师在答题卡上所粘贴条形码的姓名、考试证号是否与本人相符合,再将自己的姓名、准考证号用0.5毫米黑色墨水签字笔填写在答题卡及本试卷上.3.答选择题必须用2B 铅笔将答题卡上对应的答案标号涂黑.如需改动,请用橡皮擦干净后,再选涂其他答案.答非选择题必须用0.5毫米黑色墨水签字笔写在答题卡上的指定位置,在其他位置答题一律无效.4.作图必须用2B 铅笔作答,并请加黑加粗,描写清楚.一、选择题(本大题共6小题,每小题2分,共12分.在每小题所给出的四个选项中,恰有一项是符合题目要求的,请将正确选项前的字母代号填涂在答题卡...相应位置....上) 1.计算231⎪⎭⎫⎝⎛-•a a 的结果是( ▲ )A .aB .5aC .6aD .4a 2.下列无理数中,在-1与2之间的是( ▲ )A .3-B .2-C .2D .53.实数a ,b 在数轴上对应点的位置如图所示,则下列各式正确的是( ▲ )A . a >bB . a >-bC .-a >b4.如图,在△ABC 中,D 、E 分别是AB 、AC 上的点,且DE //BC ,若S △ADE :S △ABC =4:9,则AD :AB =( ▲ )A .1∶2B .2∶3C .1∶3D .4∶95.一元二次方程2x 2-3x -5=0的两个实数根分别为1x 、2x ,则1x +2x 的值为( ▲ ) A .25 B .-25C .-32D .326.如图,在平面直角坐标系中,⊙M 与y 轴相切于原点O ,平行 于x 轴的直线交⊙M 于P ,Q 两点,点P 在点Q 的右方,若点P 的坐标是(-1,2),则点Q 的坐标是( ▲ ) A .(-4,2) B .(-4.5,2) C .(-5,2) D .(-5.5,2) 二、填空题(本大题共10小题,每小题2分,共20分.不需写出解答过程,请把答案直接填写在答题卡相应位置.......上) ab(第3题) B九年级数学试卷 第2页(共 10 页)7.3-的倒数是 ▲ ;3-的相反数是▲.8.分解因式:29x y y -= ▲ ;计算:=-+⎪⎭⎫⎝⎛--12313312▲ .9.2015年3月1日傅家边梅花节在南京溧水区举办,截止4月1日约有53000名游客前来欣赏梅花.将53000用科学计数法表示为 ▲ . 10.使式子1+x +1有意义的x 的取值范围是 ▲ .11.2015年南京3月份某周7天的最低气温分别是 -1℃,2℃, 3℃,2℃ ,0℃, -1℃,2℃.则这7天最低气温的众数是 ▲ ℃,中位数是 ▲ ℃. 12.反比例函数xky -=1与x y 2=的图象没有交点,则k 的取值范围为 ▲ . 13.圆锥的底面直径是6,母线长为5,则圆锥侧面展开图的圆心角是 ▲ 度.14.如图,AB 为O ⊙的直径,CD 为O ⊙的弦,25ACD =o∠,则BAD ∠的度数为 ▲ °.15.如图,正六边形ABCDEF 的边长为2 3 cm ,点P 为六边形内任一点.则点P 到各边距离之和为 ▲ cm .16.现有一张边长大于4cm 的正方形纸片,如图从距离正方形的四个顶点2cm 处,沿45°角画线,将正方形纸片分成5部分,则中间一块阴影部分的面积为 ▲ cm 2. 三、解答题(本大题共11小题,共88分.请在答题卡指定区域.......内作答,解答时应写出文字说明、证明过程或演算步骤)17.(6分)解不等式组⎩⎪⎨⎪⎧5+3x >18,x 3≤4-x -22. 并写出不等式组的整数解.18.(6分)化简232224a a a a a a ⎛⎫-÷⎪+--⎝⎭ 19.(8分)如图,在□ABCD 中,∠ABD 的平分线BE 交AD 于点E ,∠CDB 的平分线DF 交BC 于点F .(第15题)(第14题)(第16题)九年级数学试卷 第3页(共 10 页)(1)求证:△ABE ≌△CDF ;(2)若AB =DB ,求证:四边形DFBE 是矩形.20.(8分)某鞋店有A 、B 、C 、D 四款运动鞋,元旦期间搞“买一送一”促销活动,求下列事件的概率:(1)小明确定购买A 款运动鞋,再从其余三款鞋中随机选取一款,恰好选中C 款; (2)随机选取两款不同的运动鞋,恰好选中A 、C 两款.21.(8分)为了解某校初二学生每周上网的时间,两位学生进行了抽样调查.小丽调查了初二电脑爱好者中40名学生每周上网的时间;小杰从全校400名初二学生中随机抽取了40名学生,调查了每周上网的时间.小丽与小杰整理各自样本数据,如下表所示.时间段 (小时/周)小丽抽样 人数小杰抽样 人数0~1 6 22 1~2 10 10 2~3 16 6 3~482(每组可含最低值,不含最高值)(1)你认为哪位同学抽取的样本不合理?请说明理由.(2)根据合理抽取的样本,把上图中的频数分布直方图补画完整;(3)专家建议每周上网2小时以上(含2小时)的同学应适当减少上网的时间,估计该校全体初二学生中有多少名同学应适当减少上网的时间?22.(8分)如图,跷跷板AB 的一端B 碰到地面时,AB 与地面的夹角为18°,且OA =OB =3m .ABC ADEF(第19题)九年级数学试卷 第4页(共 10 页)(1)求此时另一端A 离地面的距离(精确到0.1 m );(2)跷动AB ,使端点A 碰到地面,请画出点A 运动的路线(写出画法,并保留画图痕迹),并求出点A 运动路线的长.(参考数据:sin18°≈0.31,cos18°≈0.95,tan18°≈0.32)23.(8分)如图所示,某工人师傅要在一个面积为15m 2的矩形钢板上裁剪下两个相邻的正方形钢板当工作台的桌面,且要使大正方形的边长比小正方形的边长大1m .求裁剪后剩下的阴影部分的面积.24.(8分)二次函数y =2x 2+bx +c 的图象经过点(2,1),(0,1). (1)求该二次函数的表达式及函数图象的顶点坐标和对称轴;(2)若点P 12,3(y a +),Q 22,4(y a +)在抛物线上,试判断y 1与y 2的大小.(写出判断的理由)25.(8分)如图①,一条笔直的公路上有A 、B 、C 三地,B 、C 两地相距 150 千米,甲汽车从B 地乙汽车从C 地同时出发,沿公路匀速相向而行,分别驶往C 、B 两地.甲、乙ABO(第22题)18º九年级数学试卷 第5页(共 10 页)两车到A 地的距离y 1、y 2(千米)与行驶时间 x (时)的关系如图②所示.根据图象进行以下探究:(1)请在图①中标出 A 地的位置,并作简要的文字说明; (2)求图②中M 点的坐标,并解释该点的实际意义. (3)在图②中补全甲车的函数图象,求y 1与x 的函数关系式.26.(9分)已知,Rt △ABC 中,∠C =90°,AC =4, BC =3.以AC 上一点O 为圆心的⊙O 与BC 相切于点C ,与AC 相交于点D .(1)如图1,若⊙O 与AB 相切于点E ,求⊙O 的半径; (2)如图2,若⊙O 与AB 相交,且在AB 边上截得的弦FG=5,求⊙O 的半径.27.(11分)问题提出y (千米)x (时)乙甲图②图①B图1图2九年级数学试卷 第6页(共 10 页)把多边形的任一边向两方延长,如果其它各边都在延长线的同一旁,则这样的多边形为凸多边形.如平行四边形、梯形等都是凸多边形.我们教材中所说的多边形如没作特别说明,一般都是指凸多边形.把多边形的某些边向两方延长,其他各边有不在延长所得直线的同一旁,这样的多边形叫做凹多边形.凹多边形会有哪些性质呢? 初步认识如图(1),四边形ABCD 中,延长BC 到M ,则边AB 、CD 分别在直线BM 的两旁,所以四边形ABCD 就是一个凹四边形.请你画一个凹五边形.(不要说明)性质探究请你完成凹四边形一个性质的证明:如图(2),在凹四边形ABCD 中,求证:∠BCD =∠A +∠B +∠D . 类比学习我们以前曾研究过凸四边形的中点四边形问题,如图(3),在四边形ABCD 中,E 、F 、G 、H 分别是边AB 、BC 、CD 、DA 的中点,则四边形EFGH 是平行四边形.当四边形ABCD 满足一定条件时,四边形EFGH 还可能是矩形、菱形或正方形.如图(4),在凹四边形ABCD 中,AB =AD ,CB =CD ,E 、F 、G 、H 分别是边AB 、BC 、CD 、DA 的中点,请判断四边形EFGH 的形状,并证明你的结论. 拓展延伸如图(5),在凹四边形ABCD 的边上求作一点P ,使得∠BPD =∠A +∠B +∠D .(不写作法、证明,保留作图痕迹)A BCMD(图1)A BCD(图2)A BCDEFG H(图3)(图4)EABC DFGH ABCD(图5)九年级数学试卷 第7页(共 10 页)2014~2015学年度第一次调研测试数学答案一、选择题(本大题共有6小题,每小题2分,共计12分.)1.A 2. C 3.C 4.B 5.D 6.A 二、填空题(本大题共10小题,每小题2分,共计20分.)7.31-,3 8.()()33-+x x y ,39- ; 9.5.3×104 ; 10.x ≥-1 ; 11.2,2; 12.k >1 ; 13.216; 14.65; 15.18 ; 16.8.三、解答题(本大题共11小题,共计88分.)17.解: 解不等式①,得x >133;…………………………2分解不等式②,得x ≤6. …………………………4分 所以原不等式组的解集为133<x ≤6.…………………5分它的整数解为5,6. …………………………………6分 18.解法1:原式=()()()()22222223-+÷⎪⎭⎫⎝⎛-+-+-a a a a a a a a a ………………2分 =()()()()aa a a a aa 22222822-+⨯-+-……………………………4分 = 4-a ………………………………………………………6分解法2:原式=()()222223-+÷⎪⎭⎫⎝⎛--+a a a a a a a ………………1分 =()()a a a a a a a222223-+⨯⎪⎭⎫⎝⎛--+………………2分 =()()221223+--a a …………………………4分 = 4-a ……………………………………………6分19.证明:(1)在□ABCD 中,AB =CD ,∠A =∠C .………………1分∵AB ∥CD ,∴∠ABD =∠CDB . ∵BE 平分∠ABD ,DF 平分∠CDB ,∴∠ABE =12∠ABD ,∠CDF =12∠CDB .∴∠ABE =∠CDF .………………………………………3分 在△ABE 和△CDF 中,∵∠A =∠C ,AB =CD ,∠ABE =∠CDF ,∴△ABE ≌△CDF . ………………………………………4分 (2)解法1:∵□ABCD 中,∴AD ∥BC ,AD =BC∵△ABE ≌△CDF . ∴AE =CF九年级数学试卷 第8页(共 10 页)∴DE =BF ,DE ∥BF∴四边形DFBE 是平行四边形…………………………………………6分 ∵AB =DB ,BE 平分∠ABD ,∴BE ⊥AD ,即∠DEB =90°.………7分 ∴四边形DFBE 是矩形. …………………………………………8分解法2:∵AB =DB ,BE 平分∠ABD ,∴BE ⊥AD ,即∠DEB =90°. ………5分∵AB =DB ,AB =CD ,∴DB =CD .∵DF 平分∠CDB ,∴DF ⊥BC ,即∠BFD =90°.……………………6分 在□ABCD 中,∵AD ∥BC ,∴∠EDF +∠DEB =180°.∴∠EDF =90°. ………………………………………………………7分 ∴四边形DFBE 是矩形. …………………………………………8分20. (1)因为选种B 、C 、D 三款运动鞋是等可能,所以选中C 款的概率是31…3分 (2)画树状图或列表正确……………………………………………………………6分 (只有部分正确给4分)因为选中(A B )、(A C )、(A D )、(B C )、(B D )、(C D )是等可能所以选中是(A C )的概率是61…………………………………………8分 21. (1)小丽;因为她没有从全校初二学生中随机进行抽查,不具有代表性.……3分(2)直方图正确. …………………………………………………………………5分 (4)该校全体初二学生中有80名同学应适当减少上网的时间 …………………8分 22.解:(1)过点A 作地面的垂线,垂足为C .…………………………1分在Rt △ABC 中,∠ABC =18°,∴AC =AB ·sin ∠ABC …………………………2分=6·sin18°≈6×0.31≈1.9. ………………………3分答:另一端A 离地面的距离约为1.9 m . …………4分 (2)画图正确;画法各1分…………………………6分画法:以点O 为圆心,OA 长为半径画弧,交地面于点D ,则⌒AD 就是端点A 运动的路线.端点A 运动路线的长为2×18×π×3180=3π5(m ).(公式正确1分)答:端点A 运动路线的长为3π5m .……………8分 23.解:设大正方形的边长x m ,则小正方形的边长为(x -1)m .……1分 根据题意得:x (2x -1)=15………………………………………………4分 解得:x 1=3,x 2=25(不合题意舍去) ……………………6分 小正方形的边长为(x -1)=3-1=2 ……………………7分裁剪后剩下的阴影部分的面积=15-22-32=2(m 2)答:裁剪后剩下的阴影部分的面积2m 2…………………………………8分 24.解:(1)根据题意,得8+2b +c =1且c =1,解得b =-4,所以该二次函数的表达式是y =2x 2-4x +1. …………2分AB O 18º C九年级数学试卷 第9页(共 10 页)将y =2x 2-4x +1配方得y =2(x -1)2 -1, ………………………3分 所以该二次函数图象的顶点坐标为(1,-1), ………………4分 对称轴为过点(1,-1)平行于y 轴的直线; ………………………5分 (或:对称轴为直线x=1)(2)∵4+a 2>3+a 2>1,……………………………………………………………6分∴P 、Q 都在对称轴的右边,………………………………………………7分 又∵2>0,函数的图象开口向上,在对称轴的右边y 随x 的增大而增大, ∴y 1<y 2(如直接代入计算出y 1与y 2,并比较大小正确参照给分)……8分 25.解: ⑴A 地位置如图所示.使点A 满足AB ∶AC =2∶3 . ……………… 2分(图大致正确1分,文字说明1分) ⑵乙车的速度150÷2=75千米/时,9075 1.2÷=,∴M (1.2,0) …………………3分 所以点 M 表示乙车 1.2 小时到达 A 地.… 4分 ⑶甲车的函数图象如图所示. ………… 6分当01x ≤≤时,16060y x =-+;…………7分当1 2.5x <≤时,16060y x =-. …………8分26.解:(1)连接OE ,因为⊙O 与AB 相切于点E ,所以OE ⊥AB设OE =x ,则CO =x ,AO =4-x 由Rt △AO E ∽Rt △ABC ,得ABAOBC OE =∴543x x -=,解得:x =23 ∴⊙O 的半径为23………………………………4分(2)过点O 作OH ⊥AB ,垂足为点H ,……………5分则H 为FG 的中点,FH=21FG =531……6分连接OF ,设OF =x ,则OA =4-x 由Rt △AOH ∽Rt △ABC 可得OH =5312x- 在Rt △OHF 中,据勾股定理得:OF 2=FH ∴x 2=(531)2+(5312x -)2……………8解得 x 1=74, x 2=254- (舍去) 图2 图1E九年级数学试卷 第10页(共 10 页)∴⊙O 的半径为74.…………………9分 27.答:初步认识:如图(图形正确即可…………………1分 性质探究:延长BC 交AD 于点E ∵∠BCD 是△CDE 的外角∴∠BCD =∠CED +∠D ……………………………………2分 同理,∠CED 是△ABE 的外角∴∠CED =∠A +∠B ………………………………………3分 ∴∠BCD =∠A +∠B +∠D …………………………………4分 (说明:连接AC ,利用外角来说明也可) 类比学习:证明:四边形EFGH 是矩形………………………………5分 连接AC ,BD ,交EH 于点M∵E 、F 、G 、H 分别是边AB 、BC 、CD 、DA 的中点 ∴EF =HG =AC 21,E F ∥HG ∥AC ∴四边形EFGH 是平行四边形,…………………………6分 ∵AB=AD ,BC=DC ,∴A 、C 在BD 的垂直平分线上,∴AM ⊥EH ,………………………………………………7分 已证E F ∥AC ,同理可证FG ∥BD ,∴∠EFG =90°∴□EFGH 是矩形 ………………………………………8分证明二:∵AB =AD ,CB =CD ,∴∠ABD =∠ADB ,∠CBD =∠∴∠ABC =∠ADC ,∴△ABC ≌△ADC 。

2015年六年级(下)数学第一次质检

2015年六年级(下)数学第一次质检

2014-2015年六年级数学(下)第一次质检一、 计算题。

(23分)1、直接写得数。

(8分)512 ×67 = 45 -0 .8= 34 + 13 = 15 ÷4= 37 ×21= 9.82-0.2= 0.8÷0.02 = 25×3.14= 2、计算下面各题。

(15分) 65+61×32 175÷9+91×1712 2-136÷269-32 47 ÷23 -514 ×35 920 ÷[12 ×(25 + 45 )] 二、填空题。

(25分)(第1至4题每空1分,第5至11题每空2分) 1、如果李明向东走60米,记作+60m 。

那么刘军从同一地点向西走30米,可以记作( )m 。

2、( )既不是正数,也不是负数。

所有正数都在0的( )边。

3、零上9 0C 记作( )0C ,零下3 0C 记作( )0C 。

4、如果把圆柱的侧面展开可以得到一个长方形,这个长方形的长等于圆柱的底面( ),宽等于圆柱的( )。

学校 姓名 班别 学号5、把一个圆柱体削成一个最大的圆锥体,削去的体积是120cm3,则圆锥的体积是()cm3。

6、一个圆柱体的底面直径是4分米,高是3分米,它的侧面积是()平方分米,表面积是()平方分米,体积是()立方分米。

7、一个圆锥的体积是48立方厘米,底面积是16平方厘米,高是()厘米。

8、一个圆柱体和一个圆锥体体积相等,高也相等,已知圆柱的底面积是12平方分米,则圆锥的底面积()平方分米。

9、一根长3米的圆柱形木料,平均截成4段后,表面积增加了12平方分米,原来这根木料的体积是()立方分米。

10、一个圆柱体的侧面展开后,正好得到一个边长25.12厘米的正方形,圆柱体的高是()厘米。

11、某地的气温为- 1.5 0C -- 11.5 0C,这一天该地的温差是()0C。

2015届高三第一次模拟考试试卷

2015届高三第一次模拟考试试卷

2015届高三第一次模拟考试试卷英语本试题卷分四个部分,共9 页。

时量120分钟。

满分150分。

Part I Listening Comprehension (30 marks)Section A (22.5 marks)Directions: In this section,you will hear six conversations between two speakers. For each conversation, there are several questions and each question is followed by three choices marked A, B and C. Listen carefully and then choose the best answer for each question.You will hear each conversation TWICE.Conversation 11.Why does the woman need to go home?A. To see a friend.B. To feed her dog.C. To make dinner.2. What will the man do?A. Buy the woman a drink.B. Have a drink by himself.C. Go over to the woman’s house.Conversation 23. How’s the weather in most of Scotland, according to the woman?A. It’s cold and often w et.B. Summer is very hot.C. It’s dry and cold.4. What is the man’s favorite season?A. Spring.B. Summer.C. Winter.Conversation 35. What does the man plan to do?A. Attend a get-together.B. Write to a newspaper.C. Call and make a complaint.6. What did the woman do yesterday afternoon?A. She played golf.B. She stayed at home.C. She went hiking in the wetland park. Conversation 47. What position did the man have in his senior year?A. President.B. General Secretary.C. Vice-President.8. What is Atlantic University famous for?A. Its sports program.B. Its science program.C. Its community service program.9. How many Nobel Prize winners are there at the university?A. Six.B. Seven.C. Eight.Conversation 510. What does the woman think of her lifestyle?A. Special.B. Perfect.C. Boring.11. Who knows a lot about barbecues?A. Jack.B. The woman.C. The man.12. What will the speaker do to prepare for the barbecue?A. Bring a guitar.B. Buy the equipment.C. Get some meat and vegetables. Conversation 613. Where are the speakers?A. At a park.B. At a restaurant.C. At a supermarket.14. How long did it take the man to get to work today?A. A quarter of an hour.B. Half an hour.C. A full hour.15. What will the man do next?A. Order some tea.B. Go to the bathroom.C. Eat some chicken noodles.Section B (7.5 marks)Directions: In this section, you will hear a short passage. Listen carefully and thenfill in the numbered blanks with the information you have heard. Fill in each blank withNO MORE THAN THREE WORDS.You will hear the short passage TWICE.Part II Language Knowledge (45 marks)Section A (15 marks)Directions: For each of the following unfinished sentences there are four choices marked A, B,C and D. Choose the one that best completes the sentence.21. So delicious _____ that I couldn’t wait to taste it.A. the cake seemedB. was the cake seemingC. did the cake seemD. the cake did seem22. It was in the park _____ we met for the first time.A. thatB. whatC. whichD. where23. Before you quit, _____ how your family would feel about your decision.A. considerB. consideringC. consideredD. to consider24.--- Tom fell off the ladder yesterday, but he is all right now.--- What a lucky dog! He _____ himself badly.A. should injureB. should have injuredC. might injureD. could have injured25. The APP WECHAT provides a networking platform _____ communication is faster and easier.A. whichB. whereC. whenD. why26. Honesty is a quality that _____ since we were born.A. was taughtB. has taughtC. had taughtD. has been taught27. Faced with challenges, you should believe your courage is _____ makes a difference.A. howB. thatC. whichD. what28. I was just going to throw away the rubbish, but someone _____ it. Was it you?A. has doneB. will doC. had doneD. would do29. _____ television may be a splendid medium of communication, it prevents us from communicatingwith each other.A. BecauseB. WhileC. SinceD. If30. The purpose of task-based classes is to make students creative, _____ them rely on teachers.A. not makeB. not to makingC. not makingD. not to make31. ___ in northeast China with temperatures as low as -30 degrees Celsius, Harbin knows winter well.A. LocatingB. LocatedC. Being locatedD. To locate32. _____ more male nurses will help create a positive balance between male and female staff.A. HaveB. HavingC. HadD. Having had33. How many countries _____ the European Union made up of, do you know?A. areB. wereC. isD. was34. It’s too late now. ______ you make so much noise?A. MustB. WillC. ShallD. Can35. --- Remember the first time we met, Jessie?--- Of course, I do. You _____ an experiment in the chemistry lab.A. were doingB. had doneC. have doneD. didSection B (18 marks)Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.As a general rule, all forms of activity lead to boredom when they are performed on a routine basis. As a matter of fact, we can see this 36 at work in people of all ages. For example, on Christmas morning, children are excited about 37 with their new toys. But their 38 soon wears off and by January those same toys can be found put away in the basement. The world is full of 39 stamp albums and unfinished models, each standing as a monument to someone’s passing interest. When parents bring home a pet, their child 40 bathes it and brushes its fur. Within a short time, however,the 41 of caring for the animal is handed over to the parents. Adolescents enter high school with great excitement but are soon looking forward to 42 . The same is true of the young adults going to college. And then, how many 43 , who now complain about the long drives to work, nervously drove for hours at a time when they first 44 their driver’s licenses? Before people retire, they usually plan to do a lot of 45 things, which they never had time to do while working. But 46 after retirement, the golfing, the fishing, the reading and all of the other pastimes become as boring as the jobs they left. And, like the child in January, they go searching for new 47 .36. A. principle B. habit C. way D. power37. A. working B. living C. playing D. going38. A. confidence B. interest C. anxiety D. sorrow39. A. well-organized B. colorfully-printed C. newly-collected D. half-filled40. A. silently B. impatiently C. gladly D. worriedly41. A. promise B. burden C. right D. game42. A. graduation B. independence C. responsibility D. success43. A. children B. students C. adults D. retirees44. A. required B. obtained C. noticed D. discovered45. A. great B. strange C. difficult D. correct46. A. only B. well C. even D. soon47. A. pets B. toys C. friends D. colleaguesSection C (12 marks)Directions: Complete the following passage by filling in each blank with one word that best fits the context.Because neither she 48 her husband smoked, Mrs. Trench was surprised to see cigarette ash on her doorstep as she entered the house. 49 she opened the living-room door, she was astonished to see a strange man fast asleep in an armchair! Taking care not to disturb him, Mrs. Trench left the house at once. 50 called a taxi and went straight to the police station. When she got 51 , she lost no time to explain 52 had happened and added that the man must have got into the house through an open window. Mrs. Trench returned home in a police car together 53 two policemen. But it was too late: the man had disappeared. Hurrying upstairs, she went to her dressing-table. She smiled with relief when she saw the only thing 54 the man had taken was 55 imitation diamond necklace that was almost valueless!Part ⅢReading Comprehension (30 marks)Directions: Read the following three passages. Each passage is followed by several questions or unfinished statements. For each of them there are four choices marked A, B, C and D. Choose the one that fits best according to the information given in the passage.AGreen toys are so “in” this year! Green toys are great because they are made from recyclable materials and are environmentally friendly. You’d be surprised at the wide variety of green toys available. Take a look at these wonderful Green Toys!ImagiPlay PuzzlesThey’re wooden toys. They are sturdy and can last for a long time. However, it’s important to make sure that the wooden toys your children play with are safe. ImagiPlay Puzzles are made from renewable, chemical-free wood. The makers of ImagiPlay ensure that their wooden toys do not contain lead (铅) paint. These toys are brightly colored with safe paint.Idbids Plush ToysIdbids toys consist of three extremely cute cotton toys with a purpose ---to teach children the steps they can take to keep the earth happy, healthy and green. They are Scout the cloud, Lola the flower and Waverly the water drop. They are all made of Egyptian cotton that is organically grown. With the toys, you can get a storybook and a field guide.Stonees Nature’s Building BlocksStonees are actual rocks which are colored with natural pigments (颜料). You may wonder what you can do with the rocks. Well, these rocks have clever contours (轮廓) on their surface which means that they can be piled up and used to construct all kinds of structures limited only by your imagination. Xeko Trading Card GameFrom the recycled lovely packaging to the very theme of the game, the Xeko trading card game is environmentally friendly. But wait! There’s more! The Xeko game teaches your kids lots of interesting stuff about the earth and its inhabitants (居民). Kids who tried this game found it totally cool. It may be a good idea to introduce this trading card game to your kids, especially if they display an interest in math and science.56. What do we know about ImagiPlay Puzzles?A. They can be damaged easily.B. They are colored brightly with lead paint.C. They can’t be recycled.D. They are made from wood free from chemicals.57. According to the text, Idbids Plush Toys ______.A. can help kids exercise the bodyB. contain wood inside themC. are made of cotton that is organically grownD. must be put into water when being played with58. Which of the following is TRUE of Stonees Nature’s Building Blocks?A. They are not natural stones.B. They help develop kids’ imagination.C. They have no contours on their surface.D. The time they are piled up is limited.59. For a kid who loves math and science, the best choice is _______.A. ImagiPlay PuzzlesB. Idbids Plush ToysC. Stonees Nature’s Building BlocksD. Xeko Trading Card Game60. The text mainly tells us about ______.A. some popular toys that are environmentally friendlyB. the importance of protecting the environmentC. how to choose green toys for kidsD. why green toys are popular with kids.BIf there is one thing I'm sure about, it is that in a hundred years from now we will still be reading newspapers. It is not that newspapers are a necessity. Even now some people get most of their news from television or radio. Many buy a paper only on Saturday or Sunday. But for most people reading a newspaper has become a habit passed down from generation to generation.The nature of what is news may change. What basically makes news is what affects our lives—the big political stories, the coverage of the wars, earthquakes and other disasters, will continue much the same. I think there will be more coverage of scientific research,though. It's already happening in areas that may directly affect our lives,like genetic engineering. In the future, I think there will be more coverage of scientific explanations of why we feel as we do—as we develop a better understanding of how the brain operates and what our feelings really are.It's quite possible that in the next century newspapers will be transmitted electronically from Fleet Street and printed out in our own home. In fact, I'm pretty sure how it will happen in the future. You will probably be able to choose from a menu, making up your own newspapers by picking out the things you want to read—sports and international news, etc.I think people have got it wrong when they talk about competition between the different media.They actually feed off each other. Some people once foresaw that television would kill off newspapers, but that hasn't happened. What it read on the printed page lasts longer than pictures on a screen or sound lost in the air. And as for the Internet,it's never really pleasant to read something just on a screen.61.What is the BEST title for the passage?A. The best way to get newsB. The future of newspaperC. Make your own newspaperD. The changes of media62.In the writer's opinion,in the future, .A. more big political affairs, wars and disasters will make newsB. newspapers will not be printed in publishing houses any longerC. newspapers will cover more scientific researchD. more and more people will watch TV63.What will probably be in the newspaper made by yourself?A. What you are interested in.B. A menu of important news.C. The most important news.D. Sports and international news64.From the passage, we can infer .A. newspapers will win the competition among the different mediaB. newspapers will stay with us together with other mediaC. television will take the place of newspapersD. the writer believes some media will die out65.The underlined phrase “feed off” in the last paragraph means .A. kill offB. compete withC. fight withD. depend onCLivia Satterfield, born in Romania, never received a Christmas gift until she was 12. She grew up in a Romanian orphanage(孤儿院), and that first gift, a shoe box full of inexpensive things with hair barrettes sitting on top — she had always longed for such a set — changed her life. Connie Satterfield from America put the box in Livia’s hands 10 years ago when she was volunteering for the Operation Christmas Child.Franklin Graham runs the Operation Christmas Child now. The program began in 1990 in Wales when a pastor(牧师)gathered 23,000 boxes of toys for child victims of the civil war in the former Yugoslavia(南斯拉夫). The pastor later hired Graham to join, and collected 69 million shoe boxes. The program continues to grow now. This year it will send about 8 million shoe boxes full of pencils, toothbrushes, dolls and balls.Connie Satterfield said she and her husband, Ray, had talked about adopting an American child, but held off because they had a 4-year-old. However, everything changed soon when she handed Livia her box. “I saw and talked to the child, and it’s the child who I want to have. The very day I met her, I knew,” she said.The adoption process took nearly two years. Two years later, Livia reached America and became a member of the Satterfields when she was fourteen.Livia, now 22 and a student at Clayton State University, is packing the boxes for distribution worldwide. She’s working at the Suwanee storehouse where 8,000 volunteers will inspect, sort and pack 850,000 shoe boxes given by kind people. She hasn’t forgotten her first Christmas gift. That’s why she’s volunteered for several years for the yearly gathering of gifts. She wants to work full time for the organization that changed her life.66. From Paragraph 1, we can learn that Livia Satterfield______.A. had a miserable(痛苦的,可怜的) childhoodB. lost touch with her parentsC. got much care from the orphanageD. was encouraged to change her life by Connie67. What can we learn about the Operation Christmas Child?A. It is a for-profit organization.B. It was created by a British pastor.C. It buys expensive gifts for orphans every year.D. It sends only shoe boxes to children.68. When Connie Satterfield saw Livia, she______.A. wanted to adopt LiviaB. had no child in her familyC. told her husband to adopt LiviaD. didn’t intend to adopt a foreign girl69. What can we infer from the text?A. Livia was adopted when she was 22.B. Connie didn’t like Livia at first.C. Connie Satterfield had difficulties in adopting Livia.D. Livia asked Connie Satterfield to adopt her.70. Livia Satterfield works for the Operation Christmas Child because she______.A. wants to help her motherB. can’t find other better jobsC. plans to start a new lifeD. wants to pass on love to othersPart IV Writing (45 marks)Section A (10 marks)Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage. Write NO MORE THAN THREE WORDS for each answer.Career development refers to the life-long process of continuously managing professional work. The process assists people in defining their career goals clearly.Education is the first step in career development because education received in various institutions like elementary school, high school and university helps in increasing the depth of a student’s knowledge.Career development is also concerned with personality as a person needs to present himself in the best possible way in his workplace to make a mark for himself. Relevant personal qualities are important, such as loyalty to the company, responsibility and so on.Career development also emphasizes the important aspects of training. Knowledge learned in classrooms needs to be applied smartly to doing the work in a satisfactory way. For this, a good deal of training needs to be provided for the employees by their employers. Get as much training as possible!There are many objectives of career development, one of which is identifying your strengths and weaknesses. Your career won’t move in a wrong direction only if you make a concentrated effort of making full use of your strengths and working on your weaknesses. A person can understand his worth with the help of career development.Because of the development of globalization, employees may have to work in different places across the world. Therefore, adapting to the conditions that are changing is also one objective of career development. In the absence of career development programs, employees may witness a reduced productivity which will affect their career advancement.Information is another objective of career development. Employees and students must have right information about career planning and various opportunities available to them at the right time to take opportunities and achieve their goals. They need to be aware of the skills and qualities which are essential in a modern business environment.As has been stated above, one really has to do a lot in the process of career promotion. But what’s the most important is that those who are going to create a bright career future must struggle to improve themselves constantly in the whole life span.Section B (10 marks)Directions: Read the following passage. Answer the questions according to the information given in the passage.I used to frequently visit an old age home in our city Hyderabad, India. There I met a gentlemen by name Kurien in his late eighties. He served the Indian army and retired. He had one son who was well educated and also married. He just did not bother to take care of him or respect him while he was in the house.Mr. Kurien got disappointed with the life in his house and decided to move into this old age home here in Hyderabad. We both began to share a lot of thoughts whenever we met and slowly it was a daily affair that I used to spend some time with him discussing what he had done in the army: their daily schedule, march pasts, camps etc., which he used to share with lots of joy.I used to carry with me some snacks which we both used to sit under a tree and eat. I saw him really very happy in my presence. One day, h e told me with tears in his eyes “John, I have really found a very good friend in you. I feel like living some more years to spend happy time with you.”As we departed (分开), I told him “Do not worry. God will give you enough time to spend with me.” I had an official meeting and could not the next day go to the old age home. The day after when I reached the home, his room was locked. I enquired and found that he was no more. He died the very night we both met last.I really miss him. I have not given him anything worthwhile, except that I used to listen to his words and share his thoughts. Let’s share what we can.81. How was Kurien treated by his son before moving into the old age home? ( No more than 10words)______________________________________________________________________ (2 marks) 82. Why didn’t the author go to see Kurien the day before he died? ( No more than 6 words)______________________________________________________________________ (2 marks) 83. What did the author use to talk about with Kurien every day? ( No more than 10 words)______________________________________________________________________ (3 marks) 84. What did Kurien want most according to the passage? ( No more than 11words)______________________________________________________________________ (3 marks)Section C (25 marks)Directions: Write an English composition according to the instructions given below.请用下列关键词写一篇短文。

浙江省嘉兴一中2015届高三第一次模拟试卷数学(理)

浙江省嘉兴一中2015届高三第一次模拟试卷数学(理)

浙江省嘉兴市2015年高三第一次模拟考试数学(理科)试卷一、选择题(本大题共8小题,每小题5分,满分40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、设全集{}U 0,1,2,3,4=,集合{}0,1,2A =,集合{}2,3B =,则()U A B=ð( ) A .∅ B .{}1,2,3,4 C .{}2,3,4 D .{}0,1,2,3,42、已知直线10ax y +-=与直线10x ay +-=互相垂直,则a =( )A .1或1- B .1 C .1- D .0 3、已知向量()3cos ,2a α=与向量()3,4sin b α=平行,则锐角α等于( ) A .4π B .6π C .3π D .512π4、三条不重合的直线a ,b ,c 及三个不重合的平面α,β,γ,下列命题正确的是( )A .若//a α,//a β,则//αβB .若a αβ=,αγ⊥,βγ⊥,则a γ⊥C .若a α⊂,b α⊂,c β⊂,c a ⊥,c b ⊥,则αβ⊥D .若a αβ=,c γ⊂,//c α,//c β,则//a γ5、已知条件:p 2340x x --≤,条件:q 22690x x m -+-≤.若p 是q 的充分不必要条件,则m 的取值范围是( ) A .[]1,1- B .[]4,4- C .(][),44,-∞-+∞ D .(][),14,-∞-+∞6、已知直线:l cos sin 2x y αα⋅+⋅=(R α∈),圆C :222cos 2sin 0x y x y θθ++⋅+⋅=(R θ∈),则直线l 与圆C 的位置关系是( )A .相交B .相切C .相离D .与α,θ有关7、如图,已知双曲线22221x y a b-=(0a >,0b >)上有一点A ,它关于原点的对称点为B ,点F 为双曲线的右焦点,且满足F F A ⊥B ,设F α∠A B =,且,126ππα⎡⎤∈⎢⎥⎣⎦,则该双曲线离心率e 的取值范围为( )A .B .1⎤⎦C .+D .1⎤⎦8、已知函数()()()20ln 0x e x f x x x ⎧-≤⎪=⎨>⎪⎩,则下列关于函数()11y f f kx =++⎡⎤⎣⎦(0k ≠)的零点个数的判断正确的是( )A .当0k >时,有3个零点;当0k <时,有4个零点B .当0k >时,有4个零点;当0k <时,有3个零点C .无论k 为何值,均有3个零点D .无论k 为何值,均有4个零点二、填空题(本大题共7小题,第9~12题每题6分,第13~15题每题4分,共36分.)9、若实数x ,y 满足不等式组2241x y ax y y -≥⎧⎪+≤⎨⎪≥-⎩,目标函数2z x y =+.若1a =,则z 的最大值为 ;若z 存在最大值,则a 的取值范围为 . 10、一个几何体的三视图如图,其中正视图和侧视图是相同的等腰三角形,俯视图由半圆和一等腰三角形组成.则这个几何体可以看成是由 和 组成的,若它的体积是26π+,则a = .11、在C ∆AB 中,若120∠A =,1AB =,C B =,1D DC 2B =,则C A = ;D A = . 12、设等差数列{}n a 的前n 项和为n S ,若24924a a a ++=,则9S = ;810810S S ⋅的最大值为 . 13、M 是抛物线24y x =上一点,F 是焦点,且F 4M =.过点M 作准线l 的垂线,垂足为K ,则三角形F M K 的面积为 .14、设x ,y ,0z >,满足228xyz y z ++=,则422log log log x y z ++的最大值是 .15、正四面体C OAB ,其棱长为1.若C x y z OP =OA+OB+O (0x ≤,y ,1z ≤),且满足1x y z ++≥,则动点P 的轨迹所形成的空间区域的体积为 .三、解答题:(本大题共5小题,共74分.解答应写出文字说明、证明过程或演算步骤) 16.(本题满分14分)已知函数)]8cos()8)[sin(8sin(21)(πππ+-++-=x x x x f .(I )求函数)(x f 的最小正周期; (Ⅱ)当]12,2[ππ-∈x ,求函数)8(π+x f 的值域.17.(本题满分15分)在四棱锥ABCD P -中, ⊥PA 平面ABCD ,ABC ∆是正三角形,AC 与BD 的交点M 恰好是AC 中点,又4==AB PA ,︒=∠120CDA ,点N 在线段PB 上,且2=PN .(I )求证://MN 平面PDC ; (Ⅱ)求二面角B PC A --的余弦值.18.(本题满分15分)已知直线)0(1:≠+=k kx y l 与椭圆a y x =+223相交于B A 、两个不同的点,记l 与y 轴的交点为C .(Ⅰ)若1=k ,且210||=AB ,求实数a 的值; (Ⅱ)若CB AC 2=,求AOB ∆面积的最大值,及此时椭圆的方程.19.(本题满分15分)设二次函数),()(2R b a c bx ax x f ∈++=满足条件:①当R x ∈时,)(x f 的最大值为0,且)3()1(x f x f -=-成立;②二次函数)(x f 的图象与直线2-=y 交于A 、B 两点,且4||=AB .AN MBDCP(第17题)(Ⅰ)求)(x f 的解析式;(Ⅱ)求最小的实数)1(-<n n ,使得存在实数t ,只要当]1,[-∈n x 时,就有x t x f 2)(≥+成立.20.(本题满分15分)在数列}{n a 中,2,2,311+=+==-n n n n a b a a a ,.,3,2 =n (Ⅰ)求32,a a ,判断数列}{n a 的单调性并证明; (Ⅱ)求证:),3,2(|2|41|2|1 =-<--n a a n n ; (III )是否存在常数M ,对任意2≥n ,有M b b b n ≤ 32?若存在,求出M 的值;若不存在,请说明理由.参考答案一.选择题(本大题有8小题,每小题5分,共40分)1.C ;2.D ;3.A ;4.B ;5.C ;6.D ;7.B ;8.C . 7.【解析】ABF Rt ∆中,c AB c OF 2,=∴=,ααcos 2,sin 2c BF c AF ==∴ a c AF BF 2|sin cos |2||=-=-∴αα,|)4cos(|21|sin cos |1ααα+=-==∴a c e,12543,612ππαππαπ≤+≤∴≤≤]22,213[|)4cos(|2],21,426[)4cos(-∈+-∈+∴παπα]13,2[+∈∴e . 8.【解析】令1)(-=x f ,则得0=x 或ex 1=.则有1)(-=kx f 或11-e .(1)当0>k 时,①若0≤x ,则0≤kx ,12-=-kx e 或112-=-e e kx ,0=kx 或)11ln(e+,解得0=x 或k e x )11ln(+=(舍);②若0>x ,则0>kx ,1)ln(-=kx 或11-e ,解得ekx 1=或)11(-e e ,kex 1=或ke e)11(-,均满足.所以,当0>k 时,零点有3个;同理讨论可得,0<k 时,零点有3个. 所以,无论k 为何值,均有3个零点.二、填空题(本大题共7小题,第9-12题每空3分,第13-15题每空4分,共36分) 9.6,)10,0( 10.一个三棱锥,半个圆锥,1 11.3,3712.72,6413.34 14.2315.122514.【解析】),4(2)28()](8[,log log log log 2222224224yz yz yz yz z y yz z xy z xy z y x -⨯=-≤+-==++又4)24()4(2=-+≤-yz yz yz yz ,所以822≤z xy ,23log log log 224≤++z y x .当且仅当2==z y ,2=x 时,等号成立.15.【解析】点P 的轨迹所形成的空间区域为平行六面体除去正四面体OABC 的部分.易得其体积为1225.三、解答题:(本大题共5小题,共74分.解答应写出文字说明、证明过程或演算步骤) 16.(本题满分14分)已知函数)]8cos()8)[sin(8sin(21)(πππ+-++-=x x x x f .(I )求函数)(x f 的最小正周期; (Ⅱ)当]12,2[ππ-∈x ,求函数)8(π+x f 的值域.16.【解析】(I ))]8cos()8)[sin(8sin(21)(πππ+-++-=x x x x f)8cos()8sin(2)8(sin 212πππ+⋅+++-=x x x)42sin()42cos(ππ+++=x xx x x 2cos 2)22sin(2)442sin(2=+=++=πππ……5分OABC题)(第15所以,)(x f 的最小正周期ππ==22T .……7分 (Ⅱ)由(I )可知)42cos(2)8(2cos 2)8(πππ+=+=+x x x f .……9分]12,2[ππ-∈x ,]125,43[42πππ-∈+∴x ,……11分 ]1,22[)42cos(-∈+∴πx , ∴]2,1[)8(-∈+πx f .所以,)8(π+x f 的值域为]2,1[-.……14分17.(本题满分15分)在四棱锥ABCD P -中, ⊥PA 平面ABCD ,ABC ∆是正三角形,AC 与BD 的交点M 恰好是AC 中点,又4==AB PA ,︒=∠120CDA ,点N 在线段PB 上,且2=PN .(I )求证://MN 平面PDC ; (Ⅱ)求二面角B PC A --的余弦值.17.【解析】(Ⅰ)在正三角形ABC 中,32=BM在ACD ∆中,因为M 为AC 中点,AC DM ⊥, 所以CD AD =,︒=∠120CDA ,所以332=DM , 所以1:3:=MD BM ……4分在等腰直角三角形PAB 中,24,4===PB AB PA , 所以1:3:=NP BN ,MD BM NP BN ::=,所以PD MN //.又⊄MN 平面PDC ,⊂PD 平面PDC ,所以//MN 平面PDC .……7分 (Ⅱ)因为︒=∠+∠=∠90CAD BAC BAD ,所以AD AB ⊥,分别以AP AD AB ,,为x 轴, y 轴, z 轴建立如图的空间直角坐标系,所以)4,0,0(),0,334,0(),0,32,2(),0,0,4(P D C B . 由(Ⅰ)可知,)0,334,4(-=DB 为平面PAC 的法向量)4,0,4(),4,32,2(-=-=P B P C ,设平面PBC 的一个法向量为),,(z y x n =,ANMB DCP(第17题)则⎪⎩⎪⎨⎧=⋅=⋅00PB n PC n ,即⎪⎩⎪⎨⎧=-=-+04404322z x z y x ,令3=z ,则平面PBC 的一个法向量为)3,3,3(= ……13分 设二面角B PC A --的大小为θ, 则77cos ==θ, 所以二面角B PC A --余弦值为77.……15分 18.(本题满分15分)已知直线)0(1:≠+=k kx y l 与椭圆a y x =+223相交于B A 、两个不同的点,记l 与y 轴的交点为C .(Ⅰ)若1=k ,且210||=AB ,求实数a 的值; (Ⅱ)若2=,求AOB ∆面积的最大值,及此时椭圆的方程. 18.【解析】设),(),,(2211y x B y x A .(Ⅰ)41,210124312121222a x x x x a x x a y x x y -=-=+⇒=-++⇒⎩⎨⎧=++=, 2210432||2||21=⇒=-⋅=-=a a x x AB .……5分 (Ⅱ)012)3(312222=-+++⇒⎩⎨⎧=++=a kx x k ay x kx y , 22122131,32k ax x k k x x +-=+-=+⇒,……7分 由2122112)1,(2)1,(2x x y x y x CB AC -=⇒-=--⇒=,代入上式得: 2222213232kk x kk x x x +=⇒+-=-=+,……9分23323||||333||3||23||||212221=≤+=+==-=∆k k k k x x x OC S AOB ,……12分当且仅当32=k 时取等号,此时32)3(422,32222222122-=+-=-=+=k k x x x k k x .又6131221a k a x x -=+-=,因此53261=⇒-=-a a . 所以,AOB ∆面积的最大值为23,此时椭圆的方程为5322=+y x .……15分 19.(本题满分15分)设二次函数),()(2R b a c bx ax x f ∈++=满足条件:①当R x ∈时,)(x f 的最大值为0,且)3()1(x f x f -=-成立;②二次函数)(x f 的图象与直线2-=y 交于A 、B 两点,且4||=AB .(Ⅰ)求)(x f 的解析式;(Ⅱ)求最小的实数)1(-<n n ,使得存在实数t ,只要当]1,[-∈n x 时,就有x t x f 2)(≥+成立.19.【解析】(Ⅰ)由)3()1(x f x f -=-可知函数)(x f 的对称轴为1=x ,……2分 由)(x f 的最大值为0,可假设)0()1()(2<-=a x a x f . 令2)1(2-=-x a ,a x 21-±=,则易知422=-a ,21-=a . 所以,2)1(21)(--=x x f .……6分(Ⅱ)由x t x f 2)(≥+可得,x t x 2)1(212≥+--,即0)1()1(222≤-+++t x t x , 解得t t x t t 2121+--≤≤---.……8分 又x t x f 2)(≥+在]1,[-∈n x 时恒成立,可得⎪⎩⎪⎨⎧-≥+--≤---)2(121)1(21t t n t t ,由(2)得40≤≤t .……10分令t t t g 21)(---=,易知t t t g 21)(---=单调递减,所以,9)4()(-=≥g t g , 由于只需存在实数t ,故9-≥n ,则n 能取到的最小实数为9-.此时,存在实数4=t ,只要当]1,[-∈n x 时,就有x t x f 2)(≥+成立.……15分 20.(本题满分15分)在数列}{n a 中,2,2,311+=+==-n n n n a b a a a ,.,3,2 =n (Ⅰ)求32,a a ,判断数列}{n a 的单调性并证明;(Ⅱ)求证:),3,2(|2|41|2|1 =-<--n a a n n ; (III )是否存在常数M ,对任意2≥n ,有M b b b n ≤ 32?若存在,求出M 的值;若不存在,请说明理由.20.【解析】(Ⅰ)由2,311+==-n n a a a 易知,25,532+==a a .……2分由2,311+==-n n a a a 易知0>n a .由21+=-n n a a 得,212+=-n n a a (1),则有221+=+n n a a (2),由(2)-(1)得1221-+-=-n n n n a a a a ,111))((-++-=-+n n n n n n a a a a a a ,0>n a ,所以n n a a -+1与1--n n a a 同号.由03512<-=-a a 易知,01<--n n a a ,即1-<n n a a ,可知数列}{n a 单调递减. ……5分(Ⅱ)由212+=-n n a a 可得,2412-=--n n a a ,2)2)(2(1-=+--n n n a a a ,所以,2|2||2|1+-=--n n n a a a .……7分由2)2)(2(1-=+--n n n a a a 易知,2-n a 与21--n a 同号,由于02321>-=-a 可知,02>-n a ,即2>n a ,42>+∴n a ,4121<+∴n a ,所以|2|41|2|1-<--n n a a ,得证. ……10分(III ) 2)2)(2(1-=+--n n n a a a ,2221--=+-n n n a a a ,即221--=-n n n a a b ,则212222222211322132-=--=--⋅⋅--⋅--=-n n n n n a a a a a a a a a b b b .……13分 由|2|41|2|1-<--n n a a 可知, 1113322141|2|41|2|41|2|41|2|41|2|-----=-<<-<-<-<-n n n n n n a a a a a ,所以,14|2|1->-n n a ,因为2>n a ,所以1421->-n n a .当∞→n 时,∞→-14n ,故不存在常数M ,对任意2≥n ,有M b b b n ≤ 32成立. ……15分。

尚春中学2015年春期第一次集体作业

尚春中学2015年春期第一次集体作业

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尚春中学 2015 年春期第一次集体作业 九年级数学试题卷
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2015年秋高一第1次学月考试英语试题

2015年秋高一第1次学月考试英语试题

高2015级2015年秋第一次月考英语试题第Ⅰ卷(选择题,共75分)第一部分听力(共两节,满分20分)做题时,先将答案标在试卷上。

录音内容结束后,你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节(共5小题;每小题1分,满分5分)听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. What is the woman happy about?A. The free dinner.B. Her birthday party.C. A birthday present.2. What is the man listening to?A. A new song.B. A history lecture.C. An English lesson.3. What will the speakers get from Uncle Matt?A. A boat.B. Some food.C. A picnic table.4. Where are the speakers?A. In a bookstore.B. In a museum.C. In a library.5. How much will the woman pay for the socks?A. Three dollars.B. Five dollars.C. Ten dollars.第二节(共15小题;每小题1分,满分15分)听下面5段对话或独白。

每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

听第6段材料,回答第6、7题。

6. What happened to the woman?A. Her purse got stolen.B. She picked up a bank card.C. Her credit card was cut in half.7. What does the man ask the woman about?A. Her name.B. Her address.C. Her phone number.听第7段材料,回答第8至10题。

2015年高三文科数学第一次模拟试题

2015年高三文科数学第一次模拟试题

2015年高三文科数学第一次模拟试题本试卷共4页,21小题,满分150分. 考试用时120分钟. 参考公式:锥体的体积公式13V Sh =其中S 为锥体的底面积,h 为锥体的高 一、选择题:本大题共10小题,每小题5分,满分50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.若复数11z i =-,23z i =+,则复数12z z z =⋅在复平面内对应的点位于A.第一象限B. 第二象限C. 第三象限D. 第四象限 2.已知集合2{|10},{|560}M x x N x x x =-<=-+>,则MN =A. {|1}x x <B.{|12}x x <<C.{|3}x x >D. ∅ 3. 命题“(,),,,2330x y x R y R x y ∃∈∈++<”的否定是( )A. 000000(,),,,2330x y x R y R x y ∃∈∈++<B. 000000(,),,,2330x y x R y R x y ∃∈∈++≥C. (,),,,2330x y x R y R x y ∀∈∈++≥D. (,),,,2330x y x R y R x y ∀∈∈++>4.某中学为了了解学生的课外阅读情况,随机调查了50名学生,得到他们在某一天各自课外阅读所用时间的数据,结果用图1的条形图表示。

根据条形图可得这50名学生这一天平均每人的课外阅读时间为A.(小时) B.(小时) C.(小时) D.(小时) 5.已知函数()lg(1)lg(1)f x x x =-++,()lg(1)lg(1)g x x x =--+,则 A .()f x 与()g x 均为偶函数 B .()f x 为奇函数,()g x 为偶函数 C .()f x 与()g x 均为奇函数 D .()f x 为偶函数.()g x 为奇函数 6.已知向量(4,3)=a , (2,1)=-b ,如果向量λ+a b 与b 垂直,则|2|λ-a b 的值为 A .1 B 5 C.5 D .557.已知四棱锥V ABCD -,底面ABCD 是边长为3的正方形,VA ⊥平面ABCD ,且4VA =,则此四棱锥的侧面中,所有直角三角形的面积的和是A. 12B.24C.278.已知实数x y ,满足2201x y x y x +≤⎧⎪-≤⎨⎪≤≤⎩,,,则23z x y =-的最大值是A.6-B.1-C.4D.69.已知函数()y f x =,将()f x 的图象上的每一点的纵坐标保持不变,横坐标扩大到原来的2倍,然后把所得的图象沿着x 轴向左平移2π个单位,这样得到的是1sin 2y x =的图象,那么函数()y f x =的解析式是 A.1()sin 222x f x π⎛⎫=- ⎪⎝⎭ B. 1()sin 222f x x π⎛⎫=+ ⎪⎝⎭ C. 1()sin 222x f x π⎛⎫=+ ⎪⎝⎭ D. 1()sin 222f x x π⎛⎫=- ⎪⎝⎭ 10.观察下图2,可推断出“x ”应该填的数字是A .171B .183C .205D .268二、填空题:本大题共5小题,考生作答4小题,每小题5分,满分20分. (一)必做题(11~13题)11.高三某班学生每周用于数学学习的时间x (单位:小时)与数学成绩y (单位:分)之间有如下数据:x 24 15 23 19 16 11 20 16 17 13 y 92 79 97 89 64 47 83 68 71 59根据统计资料,该班学生每周用于数学学习的时间的中位数是 ▲ ; 根据上表可得回归方程的斜率为3.53,截距为13.5,若某同学每周用于数学学习的时间为18 小时,则可预测该生数学成绩是 ▲ 分(结果保留整数).12.已知椭圆的方程是125222=+y ax (5a >),它的两个焦点分别为12,F F ,且12||8F F =,弦AB (椭圆上任意两点的线段)过点1F ,则2ABF ∆的周长为 ▲ 13.如果实数,x y 满足等式22(2)3x y -+=,那么xy的最大值是 ▲( ) ▲14.(坐标系与参数方程选做题)在极坐标系中,直线(sin cos )2ρθθ-=被圆4sin ρθ=截得的弦长为 ▲15.(几何证明选讲选做题)如图3,PAB 、PCD 为⊙O 的两条割线,若PA=5,AB=7,CD=11,2AC =,则BD 等于 ▲三、解答题:本大题共6小题,满分80分. 解答须写出文字说明、证明过程和演算步骤. 16.(本小题满分12分)已知数列{}n a 是一个等差数列,且21a =,55a =-.(I )求{}n a 的通项n a 和前n 项和n S ;(II )设52n n a c -=,2n cn b =,证明数列{}n b 是等比数列. 17. (本题满分13分)在ABC ∆中,角,,A B C 的对边分别为,,,a b c 6B π=,4cos ,35A b ==. (Ⅰ)求a 的值;(Ⅱ)求sin(2)A B -的值;18.(本小题满分13分)2012年春节前,有超过20万名广西、四川等省籍的外来务工人员选择驾乘摩托车沿321国道长途跋涉返乡过年,为防止摩托车驾驶人因长途疲劳驾驶,手脚僵硬影响驾驶操作而引发交事故,肇庆市公安交警部门在321国道沿线设立了多个长途行驶摩托车驾乘人员休息站,让过往返乡过年的摩托车驾驶人有一个停车休息的场所。

北京市顺义区2015届高三第一次统一练习数学理试题缺答案

北京市顺义区2015届高三第一次统一练习数学理试题缺答案

顺义区2015届高三第一次统一练习数学试卷(理科)一、选择题(本大题共8小题,每小题5分,共40分,在每小题给出的四个选项中,选出符合题目要求的一项)1.已知集合,,则2{|320}A x x x =-+={21}B =--,,1,2A B = .{21}A --,.{1}B -,2.{1}C ,2.{2}D -,-1,1,22.在复平面内,复数对应的点位于2(12)i +第一象限 第二象限 第三象限 第四象限.A .B .C .D 3. 是“曲线关于轴对称”的2πϕ=“”sin()y x ϕ=+y 充分而不必要条件 必要而不充分条件.A .B 充分必要条件 既不充分也不必要条件.C .D 4.当时,执行如图所示的程序框图,输出的值5n =S 为.2A .4B .7C .11D 5.若,则的取值范围是441x y+=x y +.[0,1]A .[1,0]B - .[1,)C -+∞.(,1]D -∞-6.若双曲线,则其渐近线方程为22221x y a b -= .2A y x =±.4B y x =±1.2C y x =±1.4D x ± 7.若满足且的最小值为,则的值为,x y 42400kx y y x x y +≤⎧⎪-≤⎪⎨≥⎪⎪≥⎩,5z y x =-8-k 1.2A -1.2B .2C -.2D8.已知为定义在上的偶函数,当时,有,且当()f x R 0x ≥(1)()f x f x +=-[0,1)x ∈时,,给出下列命题2()log (1)f x x =+①; ②函数在定义域上是周期为2的函(2014)(2015)0f f +-=()f x 数;③直线与函数的图象有2个交点;④函数的值域为.y x =()f x ()f x (1,1)-其中正确的是①,② ②,③ ①,④ ①,②,③,④.A .B .C .D 二、填空题(本大题共6个小题,每小题5分,共30分)9.已知圆的极坐标方程为,圆心为,点的极坐标为,6sin ρθ=M N (6,)6π则||MN =10.设向量,若,则实数(2,2)a b ==- ()()a b a b λλ+⊥- λ=11.已知无穷数列满足:.则数列的前项和的最{}n a 1110,2()n n a a a n N *+=-=+∈{}n a n 小值为12. 如图,在圆内接四边形中,//,过点作圆的切线与的延长线交ABCD AB DC A CB 于点.若,则E 5,6AB AD BC AE ====BE =DC =13. 如果在一周内(周一至周日)安排四所学校的学生参观顺义啤酒厂,每天最多只安排一所学校,要求甲学校连续参观两天,其余学校均只参观一天,那么不同的安排方法有__________种(用数字作答).14.已知函数又且()cos (0),.f x x x x R ωωω=+>∈12()2,()0f x f x =-=的最小值等于.则的值为12||x x -πω三、解答题(本大题共6小题,共80分. 解答应写出文字说明,证明过程或演算步骤)在中,角所对的边分别为,已知, .ABC ∆,,A B C ,,a b c b B ==2B A π-=(I)求的值;a (II)求的值.cos C 16.(本小题满分13分)某农民在一块耕地上种植一种作物,每年种植成本为元,此作物的市场价格和这块地800上的产量均具有随机性,且互不影响,其具体情况如下表:(I )设表示该农民在这块地上种植1年此作物的利润,求的分布列;X X (II )若在这块地上连续3年种植此作物,求这3年中第二年的利润少于第一年的概率.如图,在四棱锥中,底面为直角梯形,//,,平面P ABCD -ABCD AD BC AD DC ⊥底面,为的中点,是棱的中点,PAD ⊥ABCD Q AD M PC 12,1,2PA PD BC AD CD =====(I )求证:;PQ AB ⊥(II )求直线与平面所成角的正弦值;PB PCD (III )求二面角的余弦值.P QB M --18.(本小题满分13分)已知函数.22()ln f x a x ax x =+-(I )当时,求函数的单调区间;0a >()f x (II )设,且函数在点处的切线为,直线//,且在22()()g x a x f x =-()g x 1x =l l 'l l '轴上的截距为1.求证:无论取任何实数,函数的图象恒在直线的下方.y a ()g x l '19.(本小题满分14分)已知椭圆223412.C x y +=,(I )求椭圆的离心率;C (II )设椭圆上在第二象限的点的横坐标为,过点的直线与椭圆的另一C P 1-P 12,l l C 交点分别为.且的斜率互为相反数,两点关于坐标原点 的对称点分别为,A B 12,l l ,A B O ,求四边形 的面积的最大值.,M N ABMN 20.(本小题满分13分)已知二次函数的图象的顶点坐标为,且过坐标原点.数列的前()y f x =1(1,3--O {}n a n项和为,点在二次函数的图象上.n S (,)()n n S n N *∈()y f x =(I )求数列的通项公式;{}n a (II )设,数列的前项和为,若对1cos(1),()n n n b a a n n N π*+=+∈{}n b n n T 2n T tn ≥恒成立,求实数的取值范围;n N *∈t (III )在数列中是否存在这样一些项:{}n a 123,,,,,k n n n n a a a a 123(1n n n =<<,这些项都能够构成以为首项,为公比的,)k n k N *<<<∈ 1a (05,)q q q N *<<∈等比数列?若存在,写出关于的表达式;若不存在,说明理由.{},k n a k N *∈k n k。

2015八年级上学期寒假作业(数学)

2015八年级上学期寒假作业(数学)

2015八年级上学期寒假作业(数学)一、选择题:(本题共36分,每小题3分)在下列各题的四个备选答案中,只有一个是正确的. 请将正确选项前的字母填在表格中相应的位置.题号123456789101112答案1.下列图形中,不是轴对称图形的是(A) (B) (C) (D)2.下列运算中正确的是(A) (B)(C) (D)3.在平面直角坐标系中,点 (-3,5)关于x轴的对称点的坐标是(A) (3,5) (B)(3,-5) (C)(5,-3) (D)(-3,-5)4.如果在实数范围内有意义,那么x的取值范围是(A)x ne;- (B)xlt;- (C)xge;- (D) ge;5.下列各式中,从左到右的变形是因式分解的是(A) (B)(C) (D)6.下列三个长度的线段能组成直角三角形的是(A)1,, (B)1,, (C)2,4,6 (D)5,5,67.计算,结果为(A) (B) (C) (D)8.下列各式中,正确的是(A) (B)(C) (D)9.若与的乘积中不含x的一次项,则实数m的值为(A) (B) (C) (D)10.如图,在△ABC和△CDE中,若 ,AB=CD,BC=DE,则下列结论中不正确的是(A)△ABC ≌ △CDE (B)CE=AC(C)ABperp;CD (D)E为BC中点11.如图,由四个全等的直角三角形与一个小正方形拼成一个大正方形. 如果大正方形的面积是25,小正方形的面积是1,直角三角形的两条直角边的长分别是和,那么的值为(A)49 (B)25 (C)13 (D)112.当x分别取、、、.、、、、1、、、、、、时,计算分式的值,再将所得结果相加,其和等于(A) (B) (C) (D)这篇八年级上学期寒假作业就为大家分享到这里了。

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北京市朝阳区2015届高三下学期第一次综合练习数学(理)试卷 Word版含答案

北京市朝阳区2015届高三下学期第一次综合练习数学(理)试卷 Word版含答案

北京市朝阳区2015届高三下学期第一次综合练习数学(理)试卷第Ⅰ卷一、选择题(本大题共8个小题,每小题5分,共40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、已知集合2{1,2,},{1,}A m B m ==,若B A ⊆,则M = A .0 B .2 C .0或2 D .1或22、已知点00(1,)(0)A y y >为抛物线22(0)y px p =>上一点,若点A 到该抛物线焦点的距离为3,则0y =A .2 C ..43、在ABC ∆中,若,cos 633A B BC π===,则AC =A ..4 C ..34、“2,10x Rx a x ∀∈++≥成立”是“2a ≤”的A .充分不必要条件B .必要不充分条件C .充要条件D .既不充分也不必要条件5、某商场每天上午10点开门,晚上19点停止进入,在如图所示的 框图中,t 表示整点时刻,()a t 表示时间段[1,)t t -内进入商场的人 次,S 表示面某天某整点时刻前进入商场人次总和,为了统计某天进 入商场的总人次数,则判断框内可以填A .17?t ≤B .19?t ≥C .18?t ≥D .18?t ≤ 6、设123,,x x x 均为实数,且312213223111()log (1),()log (1),()log 333x xx x x x =+=+=,则A .132x x x <<B .321x x x <<C .312x x x <<D .213x x x << 7、在平面直角坐标系中,O 为坐标原点,已知两点(1,0),(1,1)A B ,且090BOP ∠=,设()OP OA kOB k R =+∈,则OP =A .12 BC.2 8、设集合22000000{(,)|20,,}M x y x y x Z y Z =+≤∈∈,则M 中元素的个数为A .61B .65C .69D .84第Ⅱ卷二、填空题:本大题共6小题,每小题5分,共30分,把答案填在答题卷的横线上.. 9、i 为虚数单位,计算121ii-=+ 10、设n S 为等差数列{}n a 的前n 项和,若3833,1a a S +==,则通项公式n a =11、在极坐标系中,设0,02ρθπ>≤<,曲线2ρ=与曲线sin 2ρθ= 焦点的极坐标为 12、已知有身穿两种不同队服的球迷各三人,现将这六人排除一排照相,要求身穿同一种队服的球迷均不能相邻,则不同的排法种数为 (用数字作答)13、设3z x y =+,实数,x y 满足20200x y x y y t +≥⎧⎪-≤⎨⎪≤≤⎩,其中0t >,若z 的最大值为5,则实数t 的值为 ,此时z 的最小值为 .14、将体积为1的四面体第一次挖去以各棱中点为顶点构成的多面体,第二次再讲剩余的每个四面体均挖去以各棱中点为顶点构成的多面体,如此下去,共进行了次,则第一次挖去的几何体的体积是 ;这n 次共挖去的所有几何体的体积和是三、解答题:本大题共6小题,满分70分,解答应写出文字说明、证明过程或演算步骤 15、(本小题满分12分)已知函数()2cos cos ,f x x x x x R =+∈.(1)求()f x 的最小正周期和单调递减区间;(2)设()x m m R =∈是函数()y f x =图像的对称轴,求sin 4m 的值.17、(本小题满分12分)如图所示,某班一次数学测试成绩的茎叶图和频率分布直方图都受到不同程度的无损,其中,频率分布直方图的分组分布为[)[)[)[)[]50,60,60,70,70,80,80,90,90,100,据此解答如下问题:(1)求全班人数及分数在[]80,100之间的频率;(2)现从分数在[]80,100之间的试卷中任取3份学生失分情况,设抽取的试卷分数在[]90,100的份数为X ,求X 的分布列和数学期望.17、(本小题满分12分)如图,正方形ADEF 与梯形ABCD 所在平面互相垂直,已知1//,,2AB CD AD CD AB AD CD ⊥==. (1)求证://BF 平面CDE ;(2)求平面BDF 与平面CDE 所成锐二面角的余弦值;(3)线段EC 上是否存在点M ,使得平面BDM ⊥平面BDF ? 若存在,求出EMEC的值;若不存在,说明理由.18、(本小题满分12分)已知函数()2ln (1),2x f x a x a x a R =+-+∈. (1)当1a =-时,求函数()f x 的最小值; (2)当1a ≤时,讨论函数()f x 的零点个数.20、(本小题满分12分)已知椭圆2222:1(0)x y C a b a b +=>>的一个焦点为(2,0)F F 的直线与椭圆交于A 、B 两点,线段AB 中点为D ,O 为坐标原点,过的直线交椭圆于M 、N 两点. (1)求椭圆C 的方程;(2)求四边形AMBN 面积的最大值.20、(本小题满分13分)若数列{}n a 中不超过()f m 的项数恰为()m b m N +∈,则称数列{}n b 是数列{}n a 的生成数列,称相应的函数()f m 是{}n a 生成{}n b 的控制函数,设()2f m m =. (1)若数列{}n a 单调递增,且所有项都是自然数,11b =,求1a ; (2)若数列{}n a 单调递增,且所有项都是自然数,11a b =,求1a ; (3)若2(1,2,3,)n a n n ==,是否存在{}n b 生成{}n a 的控制函数()2g n pn qn r =++(其中常数,,p q r Z ∈),使得数列{}n a 也是数列{}n b 的生成数列?若存在,求出()g n ;若不存在,说明理由.。

草塔镇中2015学年第一学期八年级数学第一次阶段考试卷附参考答案

草塔镇中2015学年第一学期八年级数学第一次阶段考试卷附参考答案

草塔镇中2015学年第一学期第一次阶段考试八年级数学命题人:祝迎丹一、填空题(本题有10个小题,每小题3分,共30分)1.已知一个等腰三角形有一个角为050,则顶角是 ( )A.050 B .080 C . 050或080 D. 不能确定 2.如图,将三角尺的直角顶点放在直尺的一边上,130250∠=∠=°,°,则3∠的度数等于( )A .50°B .30°C .20°D .15°(第2题) (第3题) (第5题)3.如图,已知∠BCA=∠DCA ,那么添加下列一个条件后,仍无法判定△ABC ≌△ADC 的是( )A .CB=CDB .AB=ADC .∠BAC=∠DACD .∠B=∠D 4.长为9,6,5,4的四根木条,选其中三根组成三角形,选法有( ) A .1种 B .2种 C .3种 D .4种 5.如图,BE 、CF 都是△ABC 的角平分线,且∠BDC =1100,则∠A 的度数为( ) A .500 B . 400 C . 700 D . 350 6.已知等腰三角形的两边长分別为a 、b ,且a 、b 满足+()013322=-+b a,则此等腰三角形的周长为( )A .7或8B .6或10C .6或7D .7或10 7.如图,在△ABC 中,∠B =46°,∠C =54°,AD 平分∠BAC ,交BC 于D ,DE ∥AB ,交AC 于E ,则∠ADE 的大小是( )A .54°B .50°C .45°D .40°8.一副三角板如图叠放在一起,则图中∠α的度数为( ) A .75° B .60° C .65° D .55°9.如图,在△ABC 中,∠CAB =70º,将△ABC 绕点A 逆时针旋转到△ADE 的位置,连接EC ,满足EC ∥AB , 则∠BAD 的度数为 ( ) A .30° B .35° C .40° D .50°10.如图所示,△ABC 与△BDE 都是等边三角形,AB <BD .若△ABC 不动,将△BDC 绕B 点旋转,则在旋转过程中,AE 与CD 的大小关系为( ) A .AE =CD B .AE >CD C .AE <CD D .无法确定(第10题) (第12题)二、认真填一填 (本题有8个小题, 每小题3分, 共24分)11.若三角形的两边长分别为3、4,且周长为整数,这样的三角形共有 个.12.如图,在△ABC 和△DEF 中,已知:AC =DF ,,BC =EF ,要使△ABC ≌△DEF ,还需要的条件可以是 ;(只填写一个条件) 13.在△ABC 中,∠A:∠B:∠C=1:2:3,则∠A= 度,∠C= 度.14.已知等腰三角形的周长为17,一边长为4,则它的另两边长为 15.如图,Rt △ABC 中,∠ C=90°,AD 平分∠BAC,交BC 于点D,CD=4,则点D 到AB 的距离为16.在△ABC 中,AD 为中线,则△ABD 的面积为3,则△ACD 的面积= .第13题DB第15题(第7题) (第8题) (第9题)(第17题) (第18题)17.如图,将纸片△ABC 沿DE 折叠,点A 落在点A 1处,已知∠1+∠2=100°,则∠A = 。

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