惠州市2019三调答案
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惠州市 2021 届高三第三次调研考试数学〔理科〕答案 2021 届高三第三次调研考试数学试题 ( 理科〕答案一 . 〔本大共8 小,每小 5 分,共 40 分〕号 1 2 3 4 5 6 7 8 答案 D B D C C C C B1.【解析】答案: D z=1 2- i2 1==5-5i.故 D. 2+ i (2 +i)(2 - i)2.【解析】 B p:x 1 ,q:11 x 0 或 x 1 ,故q是p成B. x立的必要不充分条件,故3.【解析】 D 直是均匀的,故 A 不是;指数函数y (1)x是2减的,也不符合要求;数函数y log1 x 的增是慢的,也2不符合要求;将表中数据代入D中,根本符合要求 .4.【解析】 C 去掉最高分和最低分后,所剩分数84, 84, 86, 84,87,可以算得平均数和方差 .1 1 5 .【解析】答案: C 依意及面公式S=2 bcsinA ,得103 =2bcsin60 ,°得 bc= 40.又周20,故 a+ b+ c= 20,b+ c= 20-a,由余弦定理得:a2 b2 c2 2bc cos A b2 c2 2bc cos600解得 a= 7. b2 c2 bc (b c)2 3bc,故 a2 (20 a) 2 1206.【解析】答案: C 由意知,心坐(- 4,- 1),由于直心,所以4a+ b=1,从而1 4 1 4 b++= ( + )(4a+ b)= 8+a b a b a16ab≥8+ 2×4= 16(当且当b=4a 取“=〞).7.【解析】 C;根据中律,有1, 1 第1,1 ,2 第 2 , 1 ,3 第4 ,⋯, 5, 11 第56,因此第 605 , 7 .8 .【解析】 B ;假设使函数有零点,必必2 2 2 2 2 22a 4 b π ≥ 0,即a b ≥ π .654321O 1 2 3 4 5 6在坐 上将a ,b 的取 范 出,有如 所示当 a , b 足函数有零点 ,坐 位于正方形内 外的局部.3于是概率 121. 44二 . 填空 〔本大 每小5 分,共 30 分,把答案填在 后的横 上〕 9 . 12800 10 . ( - 1,2)11 . 112. 750013.1R(S ABC S ABD S ACD S BCD 14.215. 2329 .【 解析 】合体的表 面:2S主视图2S侧视图2S俯视图=2。
惠州市2019届高三第三次调研考文科综合能力测试政治试题及答案12.随着我国经济的日益发展,工业尤其是制造业急需一支高素质的技能人才队伍。
右图反映的是劳动力价格变化对劳动力供给量的影响。
若其他条件不变,当劳动力供给曲线上M点向N点移动时,可能出现的情况有A.在企业激励机制的驱动下,劳动者增加了工作量B.劳动报酬高的岗位需要高素质的劳动者,能胜任者减少C.农民工返乡创业热情高涨,创业规模逐步扩大D.我国人口老龄化速度加快,适龄制造业工人数量下降13.长期以来,我国大量小微企业、贫困人口游离于传统大型金融机构之外,如今按照党中央、国务院要求,各大银行发展普惠金融,创新信贷产品,推出专属化的“金融弱势群体”特色产品,解决“融资难、融资贵、融资慢”等问题。
上述做法旨在①降低企业融资成本,助力实体经济发展②降低银行经营风险,提高银行经济效益③满足弱势群体融资需求,促进社会公平④防范金融风险,稳定市场预期A.①④B.①③C.②③D.②④14.2018年减税降费工作持续推进,实现企业全年减税降费1万亿元的目标,与此同时,我国财政收入却同比增长10.7%。
在政府大力减税降费下,我国财政收入不降反升。
由此可推断出,减税降费A.降低企业所得税起征点→避免重复征税→促进生产专业化→社会经济效率提高B.完善税收制度→优化税种结构→激发市场活力→增加财政收入C.降低企业税负→企业创业创新积极性提高→投资需求释放→经济活力增强D.落实宽松的货币政策→营造良好市场环境→优化企业管理流程→企业利润增加15.在全球并购市场上,中国已经成为一支主导性的力量,2018年中国企业跨境并购的数量和交易金额跃居世界第一。
下图反映了我国企业海外并购的有关情况。
对此解读正确的是①我国企业海外并购的规模不断扩大②我国企业利用外资的水平不断提高③我国企业出口的产品不断升级④我国企业并购的结构不断优化A.①③B.②③C.②④D.①④16.为贯彻落实党中央关于开展扫黑除恶专项斗争重大部署,公安机关鼓励群众大胆检举揭发涉黑涉恶犯罪和“保护伞”线索,对欺压残害群众等涉黑涉恶犯罪行为严厉打击,实现基层社会稳定。
2019广东惠州届高三第三次调研考试试题理科综合生物1.下表中①②③④的概念关系与下图中所示概念对应的是()2.图为某植物细胞一个DNA分子中a、b、c三个基因的分布状况,图中I、II为无遗传效应的序列。
有关叙述正确的是()A. 在同一植物的各种细胞中,a、b、c基因都一定会表达出相应蛋白质B. a、b互为非等位基因,在亲子代间传递时可自由组合C. 基因在染色体上呈线性排列,基因的首、尾端存在起始密码子和终止密码子D. 基因b中碱基对若发生了改变,则发生了基因突变,但性状不一定改变3.下列有关现代生物进化理论的说法正确的是A. 不同物种之间、生物与无机环境之间在相互影响中不断进化和发展,这就是共同进化B. 在一个自然生态系统中,捕食者的存在不利于增加物种多样性C. 细菌在接触青霉素后才会产生抗药性的突变个体,青霉素的选择作用使其生存D. 新物种的形成都必须先经过地理隔离然后才能形成生殖隔离4.下列有关植物激素调节的叙述正确的是A. 植物激素是一种信息分子,直接参与细胞代谢B. 生长素可以通过促进乙烯的合成来促进茎段细胞伸长C. 用赤霉素处理大麦种子可以诱导α-淀粉酶的产生D. 顶端优势现象、根的向地生长、茎的背地生长都说明了生长素作用具有两重性5.为我市创建绿色现代山水城市献计献策,根据所学生态学知识判断,下列建议不合理的是A. 城市空地尽量硬化(覆盖混凝土),从而减少灰尘污染空气B. 工业污水和生活污水要处理达标后才能排放C. 轮作可以减轻病虫害的发生,从而减少化学农药对环境的污染D. 城市绿化时应该尽量选用乡土(本地)树种6.下图表示水稻一个成熟叶肉细胞代谢的某些过程(图中数字代表物质,a、b代表细胞器).下列有关分析和判断中,错误的是()A. 水生物界中,有a的细胞一定有b,而有b的细胞却不一定有aB. 如果用18O标记图中的①,则可能会出现少量的具有放射性的④C. 在b内膜上分布有ATP合成酶,而在a的基质中没有ATP合成酶D. 此类细胞可作为观察DNA和RNA在细胞中的分布的实验材料30.(9分)回答下面与酶的特性和功能有关的问题(1)甲图表示在有酶和无酶催化条件下某化学反应的能量变化,曲线___________(用“A/B”作答)表示有酶催化的化学反应,E表示的生物学意义是:____________________________,该化学反应______________(用“有/无”作答)伴随着A TP的合成。
惠州市2019届高三第三次调研考试英语2018.1.本试卷分选择题和非选择题两部分。
满分120分(最终成绩按总分135分进行折算),考试用时120分钟。
注意事项:1. 本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分。
2. 答题前,考生务必将自己的姓名,准考证号填写在答题卡相应的位置。
3. 全部答案应在答题卡上完成,答在本试卷上无效。
4. 考试结束后,将答题卡交回。
第I卷第一部分阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
AIn New York City public schools, 176 different languages are spoken among the more than1 million students. For 160,000 children, English is not their first language. New York'sDepartment of Education makes learning better for these students by providing dual-languageprograms, in which students are taught in two languages, English and another one, like Russian or Chinese. Math, social studies, science and all other regular courses are taught in bothlanguages. And they learn about the culture of the other country.Milady Baez, Deputy Chancellor of English Language Learners and Student Support, saysthese dual-language programs will help children succeed in the future. "The jobs of the future require that our students know more than one language. They are going to be traveling abroad; they are going to be communicating with people from all over the world. This will open doorsfor them."Middle-schoolers might not have jobs on their minds yet. For Kequing Jaing, she likeskeeping up her first language, Mandarin."It makes me feel that I am home because I can speakin Chinese, learn in Chinese, while learning in English. So it makes me feel better and makes me understand more about the task I'm learning."Anastasia Hudikova came to the United States when she was 2 years old. She says theRussian-English program keeps her connected to her heritage and her parents happy."They'rereally happy about the program. They are really happy that I can preserve my culture and mylanguage, and that I can speak it fluently in school."The New York schools also offer dual-language programs in seven other languages: Arabic, French, Haitian Creole, Hebrew, Korean, Polish and Spanish. There are plans to add even more languages in the future.While these dual-language programs are popular, some organizations in the U.S. sayteaching English comes first. U.S. Studies show that children who learn English early willbe more successful later.1.Dual-language programs in New York aim to __________.A. help the students learn betterB. rid the students of homesicknessC. attract more international studentsD.prevent the students forgetting their culture2.Who may not quite agree with dual-language programs?A. Milady BaezB. Kequing JaingC. Anastasia Hudikova’s parentsD. some organizations in the U.S3. The author writes the passage in order to_________.A. encourage us to learn more languagesB. introduce dual-language programs in New York schoolsC. advertise the dual-language programsD. inspire more students to study in New YorkBWriting one or two articles a day is a fair goal for a human writer. By contrast, theWordsmith platform can produce up to 2,000 articles a second! Wordsmith is one example ofnatural language-generation software, often referred to as a robot journalist. To be fair,the software doesn’t start from the beginning, like a human writer might. Instead, thesoftware takes a set of structured data and transforms it into readable text.Natural language-generation software, such as Wordsmith and Quill, does its work byidentifying trends and highlights in sets of data. The software then searches its own dictionary for the words to express its findings.Why keep human writers aroundAlthough this type of software writes faster than any human, it requires sets of structured data to work. That’s why it’s especially useful for writing earnings reports and other types of “dry” writing. Humans, on the other hand, are good at turning their unstructured thoughts directly into prose. The reports produced by Wordsmith and Quill read naturally, and theycan match the tone of human writers. But for now, the robot journalists probably won’t steal many jobs or win any Pulitzer Prizes!(普利策奖)Current applications of natural language-generation softwareFinancial reports: The software is commonly used by banks or traders to analyze largeamounts of financial data and then produce reports in plain English.Health and fitness: The software can turn data gathered from wearable devices or fitness trackers into personalized reports. The writing tone can even be adjusted to sound moreencouraging!Sports reporting: The software is often used to turn real baseball, basketball andfootball statistics into exciting stories.4. What does natural Language-generation software refer to?A. The Wordsmith platform.B. A robot journalist.C. A special dictionary.D. Articles written by computer.5. Natural language-generation software can_________.A. discover the world’s focuses through the InternetB. write well enough to win Pulitzer PrizesC. produce articles in a tone similar to human’sD. write such beautiful prose as human writers6. We can learn from the passage that natural Language-generation software ________.A. has taken the place of human writers currentlyB. is only able to turn structured data into dry reportsC. is widely used in all the fieldsD. works properly only with the help of sets of structured data7. Nowadays Natural language-generation software is seldom used by_________.A. schoolsB. banksC. hospitalsD. newspapersCIn 1959, when Jean Harper was in the third grade, her teacher gave the class an assignment to write a report on what they wanted to be when they grew up. She poured her heart into herreport and expressed her dream of becoming an airline pilot. Her paper came back with an "F"on it. The teacher told her it was a "fairy tale". Jean was heartbroken and ashamed. As theyears went by, Jean was beaten down by the discouragement and negativity she encounteredwhenever she talked about her dream. "Girls can't become airline pilots; never have, neverwill. You're crazy. That's impossible. "Finally Jean gave up.In her senior year of high school, her English teacher was a Mrs. Dorothy Slaton, a demanding teacher with high standards. One day Mrs. Slaton asked this question: "If you had unlimitedfinances, unlimited access to the finest schools, unlimited talents and abilities, what would you do?" Jean felt a rush of the old enthusiasm, and with excitement she wrote down the veryold dream.The next thing that Mrs. Slaton said changed the course of Jean's life. The teacher leaned forward over her desk and said, "I have a little secret for you. You do have unlimited abilities and talents. When you leave school, if you don't go for your dreams, no one will do it foryou. You can have what you want if you want it enough."The hurt and fear of years of discouragement disappeared all of a sudden. Jean felt thrilled and told her about her dream of becoming a pilot. Mrs. Slaton slapped the desk top. "Thendo it!" she said.So Jean did. It didn't happen overnight. In her l0 years of hard work, even facing varietiesof laugh, frustration and opposition, she never gave up her dream. Instead, she went on doing everything her third-grade teacher said was fairy-tale.Eventually, Jean Harper became a Boeing 737 captain for the United Airline Company.8. Jean’s third-grade teacher thought her dream to be ____________.A. greatB. impossibleC. challengingD. reasonable9. Mrs. Slaton may hold the view that _____________.A. only some of her students have great potentialB. her students are good enough to be admitted to the best schoolsC. belief contributes to realizing a dreamD. Jean was to have her dream realized10. According to the passage, we can infer that___________.A. Jean’s dream was always in her deep heartB. Jean owed her success to all her teachersC. most people around Jean approved of her dreamD. Jean achieved her dream with ease11. Which is the best title of the passage?A. A Respectable TeacherB. How to Realize a DreamC. Hard Work Pays offD. Reach for the SkyDDo you suffer from cybersickness?The rise of mobile phones has been blamed for a number of social ills, but your smart phone may also be making you physically sick as well. Scientists have identified a condition called “cybersickness”, which they say is the digital versio n of motion sickness. The phenomenon, which affects up to 80 percent of the population who own smart phones or tablets, leads tofeelings of sickness and unsteadiness. It is caused by seeing fast motion on a screen, which covers anything from a car chase in a film to scrolling through web pages on your phone.The more realistic the visual content appears to you, the higher your chances of getting cybersickness are . The condition was identified in a piece in the New York Times in whichBritish and US experts said that it needed solving. Motion sickness leaves sufferers feelingill because they feel movement in your muscles and your inner ear but do not see it. The mismatch in digital sickness is the opposite—you see movement on the screen but do not feel it. Theeffect is the same and the symptoms include a headache, wanting to throw up, confusion andthe need to sit down. Often cybersickness shows itself in a subtle way and sufferers put itdown to stress or eyestrain.Steven Rauch, a professor of otolaryngology(耳鼻喉科学) at Harvard Medical School, said: “Your sense of balance is different from other senses in that it has lots of inputs. Whenthose inputs don’t agree, that’s when you feel dizziness and sickness. ”Some studies that have been carried out into cybersickness found that women are moresusceptible than men, the New York Times reported. Those who have Type A’ personalities—meaning they are confident and determined—are more likely to suffer from cybersickness as well. Among those who have reported experiencing the condition have beenvideo gamers who spend hours playing fast paced games. Engineers at Oculus VR, the virtualheadset manufacturer, have admitted that digital motion sickness is one of their biggestproblems.12. From the text, we know that cybersickness ______.A. is completely equal to motion sicknessB. affects up to 80% of the population.C. leads to people’s feelings of sickness and unsteadinessD. is caused by seeing fast moving objects around13. What’s the difference between motion sickness and digital sickness?A. Digital sickness means sufferers see movement but do not feel it.B. Digital sickness means sufferers feel movement but do not see it.C. Motion sickness means sufferers see movement but do not feel it.D. Motion sickness means sufferers don’t see or feel movement14. What does the underlined word “susceptible” in the last paragraph mean?A. likely to acceptB. likely to be affectedC. likely to suspectD. likely to be cured15. This passage is most probably ____________.A. a science fictionB. a newspaper adC. a book reviewD. a science news report第二节(共5小题,每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。
广东省惠州市2019届高三第三次调研考试化学试题(Word版含答案)参考答案7、下列说法中,不正确的是A NH3的水溶液可以导电,说明NH3是电解质B 明矾水解形成Al(OH)3胶体有吸附性,可用于水的净化C 二氧化硅可用于制造光导纤维D 向淀粉碘化钾溶液中加溴水,溶液变为蓝色,说明Br2的氧化性强于I28、下列实验不能达到预期目的的是A、用饱和NaHCO3溶液除去CO2中少量的HClB、用醋和澄清石灰水验证蛋壳中含有碳酸盐C、在试管中煮沸液体时,加碎石片可防止暴沸D、用硝酸酸化的氯化钡溶液检验某溶液中是否含有SO42-9、下列说法不正确的是A、干馏煤可以得到甲烷、苯、和煤焦油等重要化工原料。
B、淀粉、纤维素和脂肪在一定条件下都可以发生水解反应。
C、用大米酿的酒在一定条件下密封保存,时间越长越香醇。
D、“乙醇汽油”是在汽油中加入乙醇生成的一种新化合物10、下列离子方程式正确的是A、碳酸钙溶于醋酸:CaCO3+2H+=== Ca2++CO2↑ +H2OB、Fe3O4溶液稀盐酸:Fe3O4+8H+==3Fe3++4H2OC、用烧碱溶液吸收氯气:Cl2+2OH-==Cl-+ClO-+H2OD、向硫酸亚铁溶液中加入用硫酸酸化的H2O2溶液Fe2++H2O2+2H+==Fe3++4H2O11、相同质量的铜片分别与过量的体积相同的浓硝酸、稀硝酸反应,二者相比较,相等的是A、铜片完全消耗时所用的时间B、反应中转移的电子总数C、反应所消耗硝酸的物质的量D、反应生成气体的体积(标准状况)12,用如图装置实验,下列叙述不正确的是A、K与N连接时,组成原电池装置B.K与N连接时,石墨电极产生气泡C.K与M连接时,一段时间后溶液的pH增小D.K与M连接时,石墨电极的反应为:2Cl--2e-==Cl2↑22、常温下,Na2CO3溶液中有平衡:A、Na2CO3溶液中:B、加入NaOH固体,溶液pH减小C、Na2CO3溶液中:D、升高温度平衡向正反应方向移动23、据下表信息,判断以下叙述正确的是部分短周期元素的原子半径及主要化合价A、GOH溶液和M(OH)3可以相互反应B、非金属性:T<QC、气态氢化物的稳定性:R>TD、L2+与T2-核外电子数相等30、化合物Ⅴ是具有抗氧化和抗肿瘤作用成分.化合物Ⅴ也可通过图所示方法合成:(1)反应①的类型________(2)化合物Ι的分子式________(3)①A的结构简式_______。
广东省惠州市2019届高三第三次调研考试数学试题(理科)本试卷共4页,21小题,满分150分。
考试用时120分钟。
参考公式: 2222121[()()()]n s x x x x x x n=-+-+⋅⋅⋅⋅+-. 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. 在复平面内,复数12z i=+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.已知条件:1p x ≤,条件1:1q x<,则q p ⌝是成立的( ) A .充分不必要条件 B .必要不充分条件 C .充要条件 D .既非充分也非必要条件 3. 某学校开展研究性学习活动,一组同学获得了下面的一组实验数据:现准备用下列四个函数中的一个近似地表示这些数据的规律,其中最接近的一个是( ) A.y =2x -2 B.y =(12)x C.y =log 2x D.y =12(x 2-1)4. 右图是2019年在惠州市举行的全省运动会上,七位评委为某跳水比赛项目打出的分数的茎叶统计图,去掉一个最高分和一个最低分后,所剩 数据的平均数和方差分别为( )A .84,4.84B .84,1.6C .85,1.6D .85,45. 若△ABC 的周长等于20,面积是103,A =60°,则BC 边的长是 ( )A .5B .6C .7D .86. 若直线ax +by +1=0(a 、b >0)过圆x 2+y 2+8x +2y +1=0的圆心,则1a +4b的最小值为( )A .8 B .12 C .16 D .207. 已知整数以按如下规律排成一列:()1,1、()1,2、()2,1、()1,3、()2,2,()3,1,()1,4,()2,3,()3,2,()4,1,……,则第60个数对是( )8 9 4 4 6 4 7 37 9俯视图侧视图NM CABOA .()10,1B .()2,10C .()5,7D .()7,58. 在区间[π,π]-内随机取两个数分别记为,a b ,则使得函数222()2πf x x ax b =+-+有零点的概率为( )A .1-8π B .1-4π C .1- 2πD .1-34π 二、填空题:本大题共7小题,考生作答6小题,每小题5分,满分30分. (一)必做题(9~13题) 9.一简单组合体的三视图及尺寸 如右图示( 单位:cm)则该组合体的表面积为 _______ 2cm .10.已知△ABC 中,点A 、B 、C 的坐标依次是A(2,-1),B(3,2),C(-3,-1),BC 边上的高为AD ,则AD →的坐标是:_______.11.在二项式52a x x ⎛⎫- ⎪⎝⎭的展开式中, x 的一次项系数是10-,则实数a 的值为 .12. 给出如图所示的程序框图,那么输出的数是________. 13. 已知ABC ∆的三边长为c b a ,,,内切圆半径为r(用的面积表示ABC S ABC ∆∆),则ABC S ∆)(21c b a r ++=; 类比这一结论有:若三棱锥BCD A -的内切球半径为R ,则三棱锥体积=-BCD A V .(二)选做题(14~15题,考生只能从中选做一题;两道题都做的,只记第14题的分) 14.(坐标系与参数方程选做)在极坐标系中,点()1,0到直线()cos sin 2ρθθ+=的距离为.15.(几何证明选讲选做题)如图,点B 在⊙O 上, M 为直径AC 上一点,BM 的延长线交⊙O 于N , 45BNA ∠= ,若⊙O 的半径为OM ,FE DCBA GFDECBA则MN 的长为 .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.(本题满分12分)已知函数()sin()f x A x ωϕ=+(0,0,,)2A x ωϕπ>><∈R 的图象的一部分如下图所示.(1)求函数()f x 的解析式;(2)当2[6,]3x ∈--时,求函数()(2)y f x f x =++的最大值与最小值及相应的x 的值.17.(本题满分12分)某商场为吸引顾客消费推出一项优惠活动.活动规则如下:消费额每满100元可转动如图所示的转盘一次,并获得相应金额的返券,假定指针等可能地停在任一位置. 若指针停在A 区域返券60元;停在B 区域返券30元;停在C 区域不返券. 例如:消费218元,可转动转盘2次,所获得的返券金额是两次金额之和. (1)若某位顾客消费128元,求返券金额不低于30元的概率; (2)若某位顾客恰好消费280元,并按规则参与了活动,他获得返券的金额记为X (元).求随机变量X 的分布列和数学期望18.(本题满分14分)2a ,5a 是方程2x 02712=+-x 的两根, 数列{}n a 是公差为正的等差数列,数列{}n b 的前n 项和为n T ,且n T 211-=n b ()*∈N n . (1)求数列{}n a ,{}n b 的通项公式; (2)记n c =n a n b ,求数列{}n c 的前n 项和n S .19.(本题满分14分)已知梯形ABCD 中,AD∥BC,∠ABC =∠BAD =2π,AB=BC=2AD=4,E 、F 分别是AB 、CD 上的点,EF∥BC,AE = x ,G 是BC 的中点.沿EF 将梯形ABCD 翻折,使平面AEFD⊥平面EBCF (如图). (1)当x=2时,求证:BD⊥EG ;(2)若以F 、B 、C 、D 为顶点的三棱锥的体积记为()f x ,求()f x 的最大值;(3)当()f x 取得最大值时,求二面角D-BF-C 的余弦值.20.(本题满分14分)已知椭圆C :)0( 12222>>=+b a b y a x 的离心率为23,过坐标原点O 且斜率为21的直线l 与C 相交于A 、B ,102||=AB .⑴求a 、b 的值;⑵若动圆1)(22=+-y m x 与椭圆C 和直线 l 都没有公共点,试求m 的取值范围.21.(本题满分14分)已知函数1163)(23--+=ax x ax x f ,1263)(2++=x x x g ,和直线m :9+=kx y . 又0)1(=-'f . (1)求a 的值;(2)是否存在k 的值,使直线m 既是曲线()y f x =的切线,又是()y g x =的切线;如果存在,求出k 的值;如果不存在,说明理由.(3)如果对于所有2-≥x 的x ,都有)(9)(x g kx x f ≤+≤成立,求k 的取值范围.惠州市2019届高三第三次调研考试数学试题(理科)答案一1.【解析】答案:D z =12+i =2-i(2+i )(2-i )=25-15i .故选D. 2.【解析】B ⌝p :1x >,q :110x x<⇔<或1x >,故q 是⌝p 成立的必要不充分条件,故选B.3.【解析】选D 直线是均匀的,故选项A 不是;指数函数1(2x y =是单调递减的,也不符合要 求;对数函数12log y x =的增长是缓慢的,也不符合要求;将表中数据代入选项D 中,基本符合要求. 4.【解析】C 去掉最高分和最低分后,所剩分数为84,84,86,84,87,可以计算得平均数和方差.5.【解析】答案:C 依题意及面积公式S =12bcsinA ,得103=12bcsin60°,得bc =40.又周长为20,故a +b +c =20,b +c =20-a ,由余弦定理得:222220222222cos 2cos60()3(20)120a b c bc A b c bc b c bc b c bc a =+-=+-=+-=+-=--,故a 解得a =7.6.【解析】答案:C 由题意知,圆心坐标为(-4,-1),由于直线过圆心,所以4a +b =1,从而1a +4b =(1a +4b )(4a +b)=8+b a +16ab ≥8+2×4=16(当且仅当b =4a 时取“=”).7.【解析】C ; 根据题中规律,有()1,1为第1项,()1,2为第2项,()1,3为第4项,…,()5,11为第56项,因此第60项为()5,7.8.【解析】B ;若使函数有零点,必须必须()()22224π0a b ∆=--+≥,即222πa b +≥.在坐标轴上将,a b 的取值范围标出,有如图所示当,a b 满足函数有零点时,坐标位于正方形内圆外的部分.于是概率为321144πππ-=-.二.填空题(本大题每小题5分,共30分,把答案填在题后的横线上)9.12800 10.(-1,2) 11.1 12.750013.)1(3ABC ABD ACD BCD R S S S S ∆∆∆∆+++ 14.215.29.【解析】该组合体的表面积为:222212800S S S cm ++侧视图主视图俯视图=。
惠州市2019届高三第三次调研考试理科数学注意事项:1.答题前,考生务必将自己的姓名、准考证号、座位号、学校、班级等考生信息填写在答题卡上。
2.作答选择题时,选出每个小题答案后,用2B铅笔把答题卡上对应题目的答案信息点涂黑。
如需改动,用橡皮擦干净后,再选涂其它答案,写在本试卷上无效。
3.非选择题必须用黑色字迹签字笔作答,答案必须写在答题卡各题指定的位置上,写在本试卷上无效。
一、选择题:在每小题给出的四个选项中,只有一项符合题目要求.1.已知集合,集合,则集合()A. B.C. D.【答案】B2.若复数满足,则在复平面内,所对应的点在()A. 第一象限B. 第二象限C. 第三象限D. 第四象限【答案】B3.若、满足约束条件,则的最大值为()A. 2B. 6C. 7D. 8【答案】C4.两个正数、的等差中项是,一个等比中项是,且,则双曲线的离心率等于()A. B. C. D.【答案】A5.已知函数与互为反函数,函数的图象与的图象关于轴对称,若,则实数的值为()A. B. C. D.【答案】D6.公元263年左右,我国数学家刘徽发现当圆内接正多边形的边数无限增加时,多边形面积可无限逼近圆的面积,并创立了“割圆术”,利用“割圆术”刘徽得到了圆周率精确到小数点后两位的近似值,这就是著名的“徽率”。
如图是利用刘徽的“割圆术”思想设计的一个程序框图,则输出的值为()(参考数据:)A. 48B. 36C. 24D. 12【答案】C7.已知直线过点,当直线与圆有两个交点时,其斜率的取值范围为()A. B.C. D.【答案】B8.一个几何体的三视图如图所示,则这个几何的体积为()立方单位。
A. B.C. D.【答案】D9.已知是抛物线的焦点,,是该抛物线上两点,,则的中点到准线的距离为()A. B. 2 C. 3 D. 4【答案】C10.在中,点是上一点,且,为上一点,向量,则的最小值为()A. 16B. 8C. 4D. 2【答案】A11.函数在内的值域为,则的取值范围为()A. B. C. D.【答案】A12.已知偶函数满足且,当时,,关于的不等式在上有且只有200个整数解,则实数的取值范围为()A. B.C. D.【答案】D二.填空题.13.已知,则_____。
惠州市2019届高三第三次调研考试数学(理科)注意事项:1.答题前,考生务必将自己的姓名、准考证号、座位号、学校、班级等考生信息填写在答题卡上。
2.作答选择题时,选出每个小题答案后,用2B 铅笔把答题卡上对应题目的答案信息点涂黑。
如需改动,用橡皮擦干净后,再选涂其它答案,写在本试卷上无效。
3.非选择题必须用黑色字迹签字笔作答,答案必须写在答题卡各题指定的位置上,写在本试卷上无效。
一、选择题:本题共12小题,每小题5分,共60分. 在每小题给出的四个选项中,只有一项符合题目要求. (1)已知集合{}2|2A x x x =+-<0,集合{}|B x x =>0,则集合A B =U ( )A .{}|1x x <B .{}|2x x >-C .{}|0x x <<1D .{}|2x x -<<1 (2)若复数z 满足1i z i ⋅=--,则在复平面内,z 所对应的点在( )A .第一象限B .第二象限C .第三象限D .第四象限(3)若x 、y 满足约束条件10040x x y x y -≥⎧⎪-≤⎨⎪+-≤⎩,则2z x y =+的最大值为( )A .2 C .7 D .8 (4)两个正数a 、b 的等差中项是72,一个等比中项是23,且a b <, 则双曲线22221x y a b -=的离心率e 等于( )A .53B .152C .54D .34(5)已知函数()y f x =与xy e =互为反函数,函数()y g x =的图象与()y f x =的图象关于x 轴对称,若()1g a =,则实数a 的值为( )A .e -B .1e -C .eD .1e(6)公元263年左右,我国数学家刘徽发现当圆内接正多边形的边数无限增加时,多边形面积可无限逼近圆的面积,并创立了“割圆术”,利用“割圆术”刘徽得到了圆周率精确到小数点后两位的近似值3.14,这 就是著名的“徽率”。