湖南省长沙市青竹湖湘一外国语学校2019-2020学年度初三下学期中考第二次模拟考试数学试卷
中考复习2023年中考数学压轴大题专题二次函数与圆压轴问题
中考复习2023年中考数学压轴大题专题二次函数与圆压轴问题【例1】(2022年江苏省常州市北郊初级中学中考二模数学试题)已知二次函数图象的顶点坐标为A(2,0),且与y轴交于点(0,1),B点坐标为(2,2),点C为抛物线上一动点,以C为圆心,CB为半径的圆交x轴于M,N两点(M在N的左侧).(1)求此二次函数的表达式;(2)当点C在抛物线上运动时,弦MN的长度是否发生变化?若变化,说明理由;若不发生变化,求出弦MN 的长;(3)当△ABM与△ABN相似时,求出M点的坐标.【例2】.(必刷卷05-2022年中考数学考前信息必刷卷(湖南岳阳专用))已知:二次函数y=ax2+bx+c的图象与x轴交于A、B两点,其中点A为(﹣1,0),与y轴负半轴交于点C(0,﹣2),其对称轴是直线x=32.(1)求二次函数y=ax2+bx+c的解析式;(2)圆O′经过点△ABC的外接圆,点E是AC延长线上一点,△BCE的平分线CD交圆O′于点D,连接AD、BD,求△ACD的面积;(3)在(2)的条件下,二次函数y=ax2+bx+c的图象上是否存在点P,使得△PDB=△CAD?如果存在,请求经典例题出所有符合条件的P点坐标;如果不存在,请说明理由.【例3】.(2022年江苏省徐州市九年级下学期第二次模拟数学试题)如图,已知二次函数y=ax2+bx+c 的图像与x轴交于A(−1,0),B(2,0)两点,与y轴交于点(0,2).(1)求此二次函数的表达式;(2)点Q在以BC为直径的圆上(点Q与点O,点B,点C均不重合),试探究QO,QB、QC的数量关系,并说明理由.(3)E点为该图像在第一象限内的一动点,过点E作直线BC的平行线,交x轴于点F.若点E从点C出发,沿着抛物线运动到点B,则点F经过的路程为______.x2+bx+c的图象经【例4】(2022年云南省德宏州初中学业水平考试模拟监测数学试题)二次函数y=34过点A(-1,0)和点C(0,-3)与x轴的另一交点为点B.(1)求b,c的值;(2)定义:在平面直角坐标系xOy中,经过该二次函数图象与坐标轴交点的圆,称为该二次函数的坐标圆.问:√10为半径作△Q,使△Q是二次函数y=在该二次函数图象的对称轴上是否存在一点Q,以点Q为圆心,5634x2+bx+c的坐标圆?若存在,求出点Q的坐标;若不存在,请说明理由;(3)如图所示,点M是线段BC上一点,过点M作MP//y轴,交二次函数的图象于点P,以M为圆心,MP为半径作△M,当△M与坐标轴相切时,求出CMMB的值.专题31二次函数与圆压轴问题1.(湖北省武汉市华中科技大学附属中学2022-2023学年九年级上学期1月考数学试题)如图,已知抛物线经过点A(−1,0),B(3,0),C(0,3)三点,点D是直线BC绕点B逆时针旋转90°后与y轴的交点,点M是线段AB 上的一个动点,设点M的坐标为(m,0),过点M作x轴的垂线交抛物线于点E,交直线BD于点F.(1)求该抛物线所表示的二次函数的解析式;(2)在点M运动过程中,若存在以EF为直径的圆恰好与y轴相切,求m的值;(3)连接AC,将△AOC绕平面内某点G旋转180°后,得到△A1O1C1,点A、O、C的对应点分别是点A1、O1、C1,是否存在点G使得△AOC旋转后得到的△A1O1C1的两个顶点恰好落在抛物线上,若存在,直接写出G 点的坐标;若不存在,请说明理由.2.(专题16二次函数中的相似三角形-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(人教版))如图,一次函数y=−2x的图象与二次函数y=−x2+3x图象的对称轴交于点B.培优训练(1)写出点B的坐标;(2)将直线y=−2x沿y轴向上平移,分别交x轴于点C、交y轴于点D,点A是该抛物线与该动直线的一个公共点,试求当△AOB的面积取最大值时,点C的坐标;(3)已知点P是二次函数y=−x2+3x图象在y轴右侧部分上的一个动点,若△PCD的外接圆直径为PC,试问:以P、C、D为顶点的三角形与△COD能否相似?若能,请求出点P的坐标;若不能,请说明理由.3.(福建省泉州市鲤城区第七中学2022-2023学年九年级下学期数学期末质量检测)如图(1)所示,y关于x的(x+m)(x−3m)(m>0)图象的顶点为M,图象交x轴于A、B两点,交y轴正半轴于D二次函数y=−√33m点.以AB为直径作圆,圆心为C.定点E的坐标为(−3,0),连接ED.(1)写出A、B、D三点的坐标;(2)当m为何值时M点在直线ED上?判定此时直线与圆的位置关系;(3)当m变化时,用m表示△AED的面积S,并在给出的直角坐标系中画出S关于m的函数图象的示意图.4.(第5章二次函数(基础、典型、易错、压轴)分类专项训练-2022-2023学年九年级数学考试满分全攻略(苏科版))如图,已知二次函数y=ax2+bx+c的图象与x轴交于A(−1,0),B(2,0)两点,与y轴交于点(0,2).(1)求此二次函数的表达式;(2)点Q在以BC为直径的圆上(点Q与点O,点B,点C均不重合),试探究QO,QB,QC的数量关系,并说明理由.(3)E点为该图象在第一象限内的一动点,过点E作直线BC的平行线,交x轴于点F.若点E从点C出发,沿着抛物线运动到点B,则点F经过的路程为.5.(湖南省长沙麓山外国语实验中学2022-2023学年九年级上学期第三次月考数学试卷)已知二次函数y= ax2+bx+c的图象与x轴交于A,B两点,其中点A为(−1,0),与y轴负半轴交于点C(0,−2),其对称.轴是直线x=32(1)求二次函数y=ax2+bx+c的解析式;(2)圆O′为△ABC的外接圆,点E是AC延长线上一点,∠BCE的平分线CD交圆O′于点D,连接AD、BD,求△ACD的面积;(3)在(2)的条件下,y轴上是否存在点P,使得以P,C,B为顶点的三角形与△BCD相似?如果存在,请求出所有符合条件的P点坐标;如果不存在,请说明理由.6.(湖南省长沙市湖南师大附中博才实验中学2022-2023学年九年级上学期第三次随堂测数学试卷)如图,x2+bx+c与x轴的一个交点A的坐标为(−3,0),以点A为圆心作圆A,与该二次函数的二次函数y=−56图象相交于点B,C,点B,C的横坐标分别为−2,−5,连接AB,AC,并且满足AB⊥AC.过点B作BM⊥x轴于点M,过点C作CN⊥x轴于点N.(1)求该二次函数的关系式;(2)经过点B作直线BD,在A点右侧与x轴交于点D,与二次函数的图象交于点E,使得∠ADB=∠ABM,连接AE,求证:AE=AD;(3)若直线y=kx+1与圆A相切,请求出k的值.7.(专题30圆与二次函数结合-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(人教版))如图,二次函数y=ax2+4的图象与x轴交于点A和点B(点A在点B的左侧),与y轴交于点C,且OA=OC(1)求二次函数的解析式;(2)若以点O为圆心的圆与直线AC相切于点D,求点D的坐标;(3)在(2)的条件下,抛物线上是否存在点P使得以P、A、D、O为顶点的四边形是直角梯形?若存在,直接写出点P坐标;若不存在,请说明理由.8.(北京市朝阳区汇文中学朝阳垂杨柳分校2020-2021学年九年级上学期期中数学试卷)定义:在平面直角坐标系中,图形G 上点P(x,y)的纵坐标y 与其横坐标x 的差y﹣x 称为P 点的“坐标差”,而图形G 上所有点的“坐标差”中的最大值称为图形G 的“特征值”.(1)△点A(1,3)的“坐标差”为;△抛物线y=−x2+3x+3的“特征值”为;(2)某二次函数y=−x2+bx+c(c≠0)的“特征值”为﹣1,点B(m,0)与点C 分别是此二次函数的图象与x 轴和y 轴的交点,且点 B 与点C 的“坐标差”相等.△直接写出m=;(用含c的式子表示)△求此二次函数的表达式.(3)如图,在平面直角坐标系xOy 中,以M(2,3)为圆心,2 为半径的圆与直线y=x 相交于点D、E,请直接写出△M 的“特征值”为.9.(湖南省长沙市中雅培粹学校2022-2023学年九年级上学期第一次月考数学试题)如图,已知抛物线经过点A(−1,0),B(3,0),C(0,3)三点,点D是直线BC绕点B逆时针旋转90°后与y轴的交点,点M是线段AB上的一个动点,设点M的坐标为(m,0),过点M作x轴的垂线交抛物线于点E,交直线BD于点F.(1)求该抛物线所表示的二次函数的解析式;(2)在点M运动过程中,若存在以EF为直径的圆恰好与y轴相切,求m的值;(3)连接AC,将ΔAOC绕平面内某点G旋转180°后,得到ΔA1O1C1,点A、O、C的对应点分别是点A1、O1、C1,是否存在点G使得ΔAOC旋转后得到的ΔA1O1C1的两个顶点恰好落在抛物线上,若存在,求出G点的坐标;若不存在,请说明理由.10.(湖南省长沙市一中双语实验学校2021-2022学年九年级上学期期末数学试题)如图,已知二次函数y= ax2+bx+3的图象与x轴交于点A(1,0)、B(−3,0),与y轴的正半轴交于点C.(1)求二次函数y=ax2+bx+3的表达式;(2)点D是线段OB上一动点,过点D作y轴的平行线,与BC交于点E,与抛物线交于点F,连接CF,探究是否存在点D使得△CEF为直角三角形?若存在,求点D的坐标;若不存在,说明理由;(3)若点P在二次函数图象上,是否存在以P为圆心,√2为半径的圆与直线BC相切,若存在,求点P的坐标;若不存在,说明理由.11.(广东省深圳市龙华区龙华区高峰学校2021-2022学年九年级下学期第三次月考数学试题)如图,已知二次函数y=ax2+bx+c(a<0,c>0)与x轴交于点A、B,与y轴交于点C,且以AB为直径的圆经过点C.(1)若点A(﹣4,0),点B(16,0),求C点坐标和函数关系式.(2)若点D是圆与抛物线的交点(D与A、B、C不重合),在(1)的条件下,坐标轴上是否存在一点P,使得以P、B、C为顶点的三角形与△CBD相似?若存在,请求点P坐标;若不存在,请说明理由.12.(2022年山东省济宁市任城区济宁学院附属中学九年级第二次模拟考试试题)如图,已知二次函数y= ax2+bx+3的图象与x轴交于点A(1,0)、B(−3,0),与y轴的正半轴交于点C(1)求二次函数y=ax2+bx+3的表达式(2)点D是线段OB上一动点,过点D作y轴的平行线,与BC交于点E,与抛物线交于点F,连接CF,BF,探究是否存在点D使得四边形ACFB的面积最大?若存在,求点D的坐标;若不存在,说明理由(3)若点P在二次函数图象上,是否存在以P为圆心,√2为半径的圆与直线BC相切,若存在,直接写点P 的坐标;若不存在,说明理由13.(2022年山东省济宁市金乡县中考二模数学试题)已知二次函数的图象交x轴于点A(3,0),B(-1,0),交y轴于点C(0,-3),P这抛物线上一动点,设点P的横坐标为m.(1)求抛物线的解析式:(2)当△P AC是以AC为直角边的直角三角形时,求点P的坐标:(3)抛物线上是否存在点P,使得以点P为圆心,2为半径的圆既与x轴相切,又与抛物线的对称轴相交?若存在,求出点P的坐标,并求出抛物线的对称轴所截的弦MN的长度;若不存在,请说明理由.(写出过程)14.(江苏省盐城市大丰区新丰初级中学2021-2022学年九年级下学期新课程结束考试数学试题(一模))如图1,在平面直角坐标系中,O为坐标原点,点A、B为抛物线y=x2上的两个动点,且OA△OB.(1)若点B的坐标是(2,m),则点A的坐标是;(2)过点B作BC△x轴,垂足为C,若△AOB与△OBC相似,求cos△OBA.(3)在(1)问的条件下,若点E为二次函数第一象限内抛物线上一动点,EH垂直于X轴于点H,交线段AB 于点F,以EF为直径的圆M与AB交于点R,求当△EFR周长取最大值时E点的坐标;(4)在(3)问的条件下,以BH为直径作圆N,点P为圆N上一动点,连接AP,Q为AP上一点且AQ=12AP,连接HQ,求OQ的最小值;15.(2022年广西河池市凤山县中考模拟(二)数学试题)如图,二次函数y=ax2+4的图象与x轴交于点A和点B(点A在点B的左侧),与y轴交于点C,且tan△OAC=1.(1)求二次函数的解析式;(2)若以点O为圆心的圆与直线AC相切于点D,求点D的坐标;(3)在(2)的条件下,抛物线上是否存在点P使得以P、A、D、O为顶点的四边形是直角梯形?若存在,直接写出点P坐标;若不存在,请说明理由.16.(湖北省鄂州市吴都中学2021-2022学年九年级下学期第一次月考数学试题)如图1,在平面直角坐标系中,二次函数y=ax2+bx+c(a>0)的图象的顶点为D点,与y轴交于C点,与x轴交于A、B两点,A点在原点的左侧,B点的坐标为(3,0),OB=OC,tan△ACO=13.(1)求这个二次函数的表达式;(2)经过C、D两点的直线,与x轴交于点E,在该抛物线上是否存在这样的点F,使以点A、C、E、F为顶点的四边形为平行四边形?若存在,请求出点F的坐标;若不存在,请说明理由;(3)若平行于x轴的直线与该抛物线交于M、N两点,且以MN为直径的圆与x轴相切,求该圆半径的长度.17.(2022年新疆维吾尔自治区乌鲁木齐市天山区一模数学试题)如图,已知二次函数y=−14x2+32x+4的图像与x轴交于点A,B,与y轴交于点C,顶点为D,连接BC;(1)求顶点D的坐标;(2)求直线BC的解析式;(3)点E是第一象限内抛物线上的动点,连接BE,CE,求△BCE面积的最大值;(4)以AB为直径,M为圆心作圆M,试判断直线CD与圆M的位置关系,并说明理由18.(专题09二次函数与圆综合问题-挑战2022年中考数学压轴题之学霸秘笈大揭秘)定义:平面直角坐标系xOy中,过二次函数图像与坐标轴交点的圆,称为该二次函数的坐标圆.(1)已知点P(2,2),以P为圆心,√5为半径作圆.请判断△P是不是二次函数y=x2﹣4x+3的坐标圆,并说明理由;(2)已知二次函数y=x2﹣4x+4图像的顶点为A,坐标圆的圆心为P,如图1,求△POA周长的最小值;(3)已知二次函数y=ax2﹣4x+4(0<a<1)图像交x轴于点A,B,交y轴于点C,与坐标圆的第四个交点为D,连接PC,PD,如图2.若△CPD=120°,求a的值.19.(湖南省长沙市青竹湖湘一外国语学校2020-2021学年九年级下学期第二次模拟考试数学试题)已知二次函数的图象经过点A(2,0),B(−4,0),C(0,4),点F为二次函数第二象限内抛物线上一动点,FH⊥x 轴于点H,交直线BC于点D,以FD为直径的圆△M与BC交于点E.(1)求这个二次函数的关系式;(2)当三角形EFD周长最大时.求此时点F点坐标及三角形EFD的周长;(3)在(2)的条件下,点N为△M上一动点,连接BN,点Q为BN的中点,连接HQ,求HQ的取值范围.20.(江苏省宿迁市沭阳县怀文中学2021-2022学年九年级上学期期末数学试题)如图,已知二次函数y= ax2+bx+c的图象与x轴交于A和B(3,0)两点,与y轴交于C(0,−2),对称轴为直线x=5,连接BC,在直4线BC上有一动点P,过点P作y轴的平行线交二次函数的图像于点N,交x轴于点M,(1)求抛物线与直线BC的函数解析式;(2)设点M的坐标为(m,0),求当以PN为直径的圆与y轴相切时m的值:(3)若点P在线段BC上运动,则是否存在这样的点P,使得△CPN与△BPM相似,若存在请直接写出点P 的坐标,若不存在,请写出理由.。
2024年湖南省长沙市青竹湖湘一外国语学校九年级中考二模考试英语试题(含答案)
2023-2024-2青竹湖湘一九下二模考试英语注意事项:1、答题前,请考生先将自己的姓名、准考证号填写清楚,并认真核对条形码上的姓名、准考证号、考室和座位号;2、必须在答题卡上答题,在草稿纸、试题卷上答题无效;3、答题时,请考生注意各大题题号后面的答题提示;4、请勿折叠答题卡,保持字体工整、笔迹清晰、卡面清洁;5、答题卡上不得使用涂改液、涂改胶和贴纸;6、本学科试卷中听力材料以中速朗读两遍。
试卷分四个部分,61小题,时量100分钟,满分100分。
I.听力(共两节,满分20分)略II.阅读(共两节,满分30分)第一节(共11小题;每小题2分,满分22分)阅读下列材料,从每题所给的A、B、C三个选项中,选出最佳选项。
21. Judy wants to spend at least four months on volunteer work, so she can join _______.A. Make our Oceans Plastic-FreeB. Solar Energy WorkshopC. Work in a National Park22. What can volunteers in Health & Environment Supporter do in their free time?A. B. C.23. Which of the followings is NOT true according to the chart?A. V olunteers in the National Park need to clean up to park.B. Solar Energy Workshop needs English masters or Spanish beginners.C. V olunteers in Make our Oceans Plastic-Free work in the morning on weekends.BFireworks(烟花) rose into the night sky and spelt the message: “One world,One Family”. Many people still remember the amazing sc ene during the Beijing2022 Winter Olympics. Today, fireworks are becoming increasingly eye-catchingand able to create different shapes and add more fun to festivals and big eventslike the Olympics.People from all over the world like using Chinese fireworks to make the night sky colorful. Most of them are produced in Hunan and Jiangxi provinces. With a long history in China, firework production used to be one of the most dangerous industries, but the use of modern machines and technologies has made it safer and greener.In Liuyang, Hunan, modern machines now work in all of its firework factories. With them, there are fewer factory accidents. They also require much fewer workers and less space than before.The Liuyang government has used an intelligent system at firework factories to help find out risks before an accident happens. In Dayao, a town in Liuyang, every firework factory has intelligent cameras. For safe production, only one worker can get into some areas in the factories, and there will be warning messages if more than one person appears in those areas. A similar system is also used in the firework factories in Wanzai, Jiangxi. It has helped discover a lot of safety problems.▲The city of Liuyang has set up research centers and worked with universities across the country to make fireworks environmentally friendly, such as improving the quality of the fireworks to produce less smoke.As the birthplace of fireworks, Liuyang makes efforts to bring safer and cleaner Chinese fireworks to the whole world.24. What do we know about Chinese fireworks?A. They are popular at home and abroad.B. They are mainly produced in North China.C. It’s more dangerous to produce fireworks now.25. Why do the firework factories in Liuyang use the intelligent system?A. To guide workers.B. To help save money.C. To make the production safe.26. Which of the following can be put into ▲?A. Have you ever watched a firework show?B. Firework production also cause less pollution now.C. Thanks to the intelligent system, no accidents have happened.27. What is the main idea of the passage?A. More and more firework factories appear in China.B. Firework production in China needs fewer workers.C. Firework production becomes safer and greener in China.CA museum can be a place that transports people back to a historic moment, atreasure house for artists, or an escape on a hot summer day. As the museumcraze has grown strong in the past few years, teenagers in China have becomemore interested in the exploring museums, where they can lose themselves inmodern technology as well as culture from the past. According to EducatorMagazine, visits by teenagers to museums each year increased from 220 millionto 290 million between 2017 and 2023. Among the increasing numbers of museum visitors, many of them were accompanied(陪伴) by their families.To draw younger visitors, many museums are creating more activities and products for the purpose of spreading Chinese culture, including artifact(手工艺品) making, night visits, secret adventures, treasure repair, and some interesting courses. At the China Hangzhou Arts & Crafts Museum, for example, teenagers gathered around to make paper umbrellas during the Spring Festival holiday. With white gloves on and little tools in their hands, visitors in Henan Museum got to experience the daily work of archaeologists(考古学家), who often spend the whole day examining the remains of buildings and objects found in the ground.Apart from these teenager-favorite activities, some museums are riding the wave(浪) of going digital. A hall called Popular Agricultural Science for Young Visitors uses both visual and audio(视听) technology to help teenagers to join in agriculture(农业). Besides this offline form, the Palace Museum has also created its website for teenagers. Here, online visitors may go on an unusual adventure at the museum in the style of a comic(漫画) book.For Huang Le, a local museum is her go-to spot whenever she travels to a new city. She said to Educator Magazine: “A museum is like a 3D encyclopedia(百科全书). We should always get our kids to be fully immersed(沉浸) in museums and fall in love with learning through them.”28. What is the writer’s purpose of showing numbers in Paragraph 1?A. To advertise for Chinese museums.B. To encourage more people explore museums.C. To show the museums’ increasing popularity.29. What creative activities can visitors do in the museums?①experience archaeological work ②watch the oil paper umbrella show③learn how to repair the treasure ④visit museums at nightA.①③④B. ①②④C. ②③④30. What does the underlined word “digital” mean in Paragraph 3?A. 现实化B. 数字化C. 农业化31. What’s the best title for the passage?A. How Do Museums Win the Hearts of Teenagers?B. How Do Museums Provide Creative Exploration Online?C. How Do Teenagers Spend Summer Vacation in Museums?第二节(共4小题;每小题2分,满分8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。
湖南省长沙市青竹湖湘一外国语学校2019-2020学年中考数学模拟调研测试题
湖南省长沙市青竹湖湘一外国语学校2019-2020学年中考数学模拟调研测试题一、选择题1.如图,在平面直角坐标系中,点A ,C 在x 轴上,点C 的坐标为(﹣1,0),AC=2.将Rt △ABC 先绕点C 顺时针旋转90°,再向右平移3个单位长度,则变换后点A 的对应点坐标是( )A.(2,2)B.(1,2)C.(﹣1,2)D.(2,﹣1)2.下列计算中,正确的是( ) A.223a a a += B.32a a a -= C.223a a a ⋅=D.()212a a += 3.如图是由5个相同的正方体搭成的几何体,其左视图是( )A. B.C. D.4.实数a,b,c 在数轴上的对应点的位置如图所示,则正确的结论是( )A .a b >B .0a b +>C .0ac >D .a c >5.某医疗器械公司接到400件医疗器械的订单,由于生产线系统升级,实际每月生产能力比原计划提高了30%,结果比原计划提前4个月完成交货.设每月原计划生产的医疗器械有x 件,则下列方程正确的是( )A .400400(130%)x x -+=4B .400400(130%)x x-+=4 C .400400(130%)x x --=4 D .4004004(130%)x x -=- 6.如图所示的几何体的俯视图为( )A. B .C. D .7.如图所示,在平行四边形ABCD 中,对角线AC 与BD 相交于点O ,过点O 作EF ∥BC ,EF 与AB 、CD 分别相交于点E 、F ,则△DOF 的面积与△BOA 的面积之比为( )A .1:2B .1:4C .1:8D .1:168.如图,点A (m ,1),B (2,n )在双曲线k y x=(k≠0),连接OA ,OB .若S △ABO =8,则k 的值是( )A .﹣12B .﹣8C .﹣6D .﹣49)A.2B.4C.-2D.-4 10.下列计算正确的是( )A .3a ﹣a =3B .(a 2)3=a 6C .3a+2a =2a 2D .a 2﹣a 2=a 4 11.我国明代数学家程大位的名著《直接算法统宗》里有一道著名算题:“一百馒头一百僧,大僧三个更无争,小僧三人分一个,大小和尚各几丁?”意思是有100个和尚分100个馒头,正好分完.如果大和尚一人分3个,小和尚3人分一个,试问大小和尚各几人?设大、小和尚各有x 、y 人,则可以列方程组( )A .131003100x y x y ⎧+=⎪⎨⎪+=⎩B .11003100x y x y ⎧+=⎪⎨⎪+=⎩ C .33100100x y x y +=⎧⎨+=⎩ D .1110033100x y x y ⎧+=⎪⎨⎪+=⎩ 12.已知点A (t ,y 1),B (t+2,y 2)在抛物线212y x =的图象上,且﹣2≤t≤2,则线段AB 长的最大值、最小值分别是( ) A .2B .C .,2D .,二、填空题 13.如图,已知△ABC 中,∠BAC =120°,AB =AC =.D 为BC 边一点,且BD :DC =1:2.以D 为一个点作等边△DEF ,且DE =DC 连接AE ,将等边△DEF 绕点D 旋转一周,在整个旋转过程中,当AE 取得最大值时AF 的长为_____.14.如图,AOB 中,AOB 90∠=,AO 3=,BO 6=,AOB 绕顶点O 逆时针旋转到A'OB'处,此时线段A'B'与BO 的交点E 为BO 的中点,则线段B'E 的长度为______.15.如图,△ABC 的三个顶点分别为A (1,2),B (1,3),C (3,1).若反比例函数k y x=在第一象限内的图象与△ABC 有公共点,则k 的取值范围是________.16_____17.写出以2+2____(要求化成一般形式).18.﹣1的相反数是_____.三、解答题19.计算:214sin 4522-⎛⎫︒--- ⎪⎝⎭. 20.某店铺经营某种品牌童装,购进时的单价是40元,根据市场调查,当销售单价是60元时,每天销售量是200件,销售单价每降低1元,就可多售出20件.(1)求出销售量y 件)与销售单价x (元)之间的函数关系式;(2)求出销售该品牌童装获得的利润W (元)与销售单价x 元)之间的函数关系式;(3)若装厂规定该品牌童装的销售单价不低于56元且不高于60元,则此服装店销售该品牌童装获得的最大利润是多少?21.如图,△OAB 中,OA =OB =5cm ,AB 长为8cm ,以点O 为圆心6cm 为直径的⊙O 交线段OA 于点C ,交直线OB 于点E 、D ,连接CD ,EC .(1)求证:△OCD ∽△OAB ;(2)求证:AB 为⊙0的切线;(3)在(2)的结论下,连接点E 和切点,交OA 于点F 求证:OF•CE=OD•CF.22.如图,一座山的一段斜坡BD的长度为600米,且这段斜坡的坡度i=1(沿斜坡从B到D时,其升高的高度与水平前进的距离之比),另一段斜坡AD的长400米,在斜坡BD的坡顶D处测得山顶A 的仰角为45°(1)求斜坡BD的坡顶D到地面BC的高度是多少米?(2)求BC.(结果保留根号)23.如图,一次函数y1=kx+b(k,b为常数,k≠0)的图象与反比例函数y2=mx(m为常数,m≠0)的图象相交于点M(1,4)和点N(4,n).(1)反比例函数与一次函数的解析式.(2)函数y2=mx的图象(x>0)上有一个动点C,若先将直线MN平移使它过点C,再绕点C旋转得到直线PQ,PQ交x轴于点A,交y轴点B,若BC=2CA,求OA•OB的值.24.2011年,陕西西安被教育部列为“减负”工作改革试点地区.学生的学业负担过重会严重影响学生对待学习的态度.为此我市教育部门对部分学校的八年级学生对待学习的态度进行了一次抽样调查(把学习态度分为三个层级,A级:对学习很感兴趣;B级:对学习较感兴趣;C级:对学习不感兴趣),并将调查结果绘制成图①和图②的统计图(不完整).请根据图中提供的信息,解答下列问题:(1)此次抽样调查中,共调查了名学生;(2)将图①补充完整;(3)求出图②中C级所占的圆心角的度数;(4)根据抽样调查结果,请你估计我市近80000名八年级学生中大约有多少名学生学习态度达标(达标包括A级和B级)?∠的平分线交O于点D. 25.已知O的直径为10,点A,B,C在O上,CAB(I)如图①,当BC为OO的直径时,求BD的长;(Ⅱ)如图②,当BD=5时,求∠CDB的度数。
长沙青竹湖湘一外国语学校2019 -2020学年第二学期初三语文入学考试(无答案)
一、积累与运用(共26分)1.下列句子中,没有错别字并且加点字的注音完全正确的一项是()(2分)A.高原上的花朵,摇曳如泛滥的灯火,是高原人用心捧出的一枚枚火种,缭原,弥.(mín)漫,轻摇轻荡,平衡着高原的荒芜,将高原小城的面容照亮,即使再黑的夜,高原人都能提灯还家。
B. 从情感说,《古诗十九首》感情纯真诚挚,没有骄揉造作;从艺术表现说,它的写境用语好像都是信手拈来,没有错彩镂金式的加工。
就古代诗歌发展的实际而言,完全可以称它为“五言之冠.(guàn)冕"。
C. 中考倒计时100天,父亲郑重其事地把倒计时日历交给我,我低下头,端祥着上面醒目的数字,暗暗下定决心,我一定要做好自己人生的主舵.(tuó)手。
D. 那个孩子的鞠躬一直印在我的记忆里:他站在斑马线上,穿着肥大夹.(jiá)袄的小小身躯面向停在前方的公交车,挥手,弯腰,温暖了一车的乘客,更让我们看到了礼数传承、感思教育的珍贵。
2. 下列各句,加点词语使用不正确的一项是( ) (2分)诗的格律可以学习,但诗的妙处却无法传授。
一个人要想写出好诗,只能靠自己静观玄思,融会贯通....,他人无能为力。
循着固有的道路,也许只会贻笑大方....;按照公认的规律,最终可能竹篮打水一场空。
可以隐居,但未必能成为陶潜、王维;也可以参军,但成为高适、岑参的机会实在渺茫。
格律再谨严,也追不上王维的别.有用心.....,多琢磨是写好诗的唯一途径。
...;酒喝得再多,也学不来李白的飘逸风流。
因此,玉.不琢不成器A融会贯通 B.贻笑大方 C.别有用心 D.玉不琢不成器3. 下列句子没有语病的一项是( ) (2分)A. 我们的先祖把能够驯化的物种进行培育、筛选,一定是依照口味进行的淘汰和选择。
B初三阶段四次月考成绩告诉我们,要想提高成绩,必须紧跟老师,不断查漏补缺。
C.范进喜极发疯而叫“噫!好了!我中了!”,他这句话的后面,包容了多么丰富的暗含的潜台词啊!D.傅雷对博聪和傅敏童年严格的管教,虽不为常人所认同,所以确乎出自他对儿子更为深沉的爱。
2019-2020-2青一九下第二次月考-数学试卷
24.定义:我们知道,四边形的一条对角线把这个四边形分成了两个三角形,如果这两个三角形相似(不全 等),我们就把这条对角线叫做这个四边形的“相似对角线”.
长沙市青竹湖湘一外国语学校 2020 年九年级下学期第二次月考
数学
总分:120 分 时量:120 分钟
一、选择题(本大题共 12 小题,共 36 分)
1.下列各数中,比 4 小的数是( )
A. 2.5
B. 5
C. 0
D. 2
2.下列各式中,运算正确的是( )
A. a3 2 a5
B. a b2 a2 b2
B. 3, 6
C.
6,
9 2
D.
9 2
,
6
二、填空题(本大题共 6 小题,共 18 分)
13.单项式 2 x2 y 的系数是_____________. 3
14.分解因式: x2 y 9 y _____________.
15.为了估计虾塘里海虾的数目,第一次捕捞了 500 只虾,将这些虾一一做上标记后放回虾塘.几天后,第 二次捕捞了 2000 只虾,发现其中有 20 只虾身上有标记,则可估计该虾塘里约有_____________只虾.
线,垂足分别为 M 、 N .在 E 、 F 两点的运动过程中,试探究: ① AM 是否是一个定值?如果是,请求出这个定值,如果不是,请说明理由; DN ②若将 ADE 沿着 DE 翻折得到 ADE ,将 BDF 沿着 DF 翻折得到 BDF ,当点 F 从点 B 运
湖南省长沙市青竹湖湘一外国语学校2019届初三下学期期中语文试卷(答案版)
湖南省长沙市青竹湖湘一外国语学校2019届初三下学期期中语文试卷(答案版)青竹湖湘一外国语学校初三下学期期中语文注意事项:1、答题前,请考生先将自己的姓名、班级、考场号、座位号填写清楚;2、必须在答卷上答题,在草稿纸、试题卷上答题无效;3、答题时,请考生注意各大题题号后面的答题提示;4、请注意卷面,保持字体工整、笔迹清晰、卷面清洁;5、答卷上不准使用涂改液,涂改胶和贴纸.6、本试卷共27道小题,时量150分钟,满分150分.一、积累与运用(共26分)1.下列各组词语中字形和加点字的注音完全正确的一项是()(2分)A.攫.取(jué) 缄默挑拨离间.(jiàn) 轻歌曼舞B.虔.诚(qián) 磅礴舳.舻相接(zhóu) 不修边副C.狩.猎(shòu) 湎怀接踵.而至(zhǒng) 分崩离析D.冗.杂(rǒng) 涌跃强.词夺理(qiáng) 自圆其说2.下列加点词语运用不正确的一项是()(2分)窗,注定要与诗词结缘的,它是诗人吟咏不尽的题材。
文人墨客在浩如烟海的古诗词中就能信手拈来,有杜甫的“窗含西岭千秋雪”,毛滂的“窗破月寻人”,王维的“来日绮窗前”,这些名诗佳句,至今还广为传诵,因此,人们一般都与窗平易近人.但也有一种情况例外,那就是绝无半点诗意的“铁窗”。
人如遭牢狱之灾,失去了自由,那就连窗也变得硬邦邦,冷冰冰的了,此时的窗,就有了某种警世的意味。
A.结缘B.浩如烟海C.信手拈来D.平易近人3. 下列语句中没有语病的一项是()(2分)A.暖风和煦的3月,我校小学部的孩子们来剑了长沙县金井镇湘丰茶博园实践基地进行了“我与茶叶交朋友”主题科普。
B.近日,在长沙市博物馆,举行了我校《国家宝藏》活动的总结汇报及优秀作品展。
C.在初三中考动员会上,老师们郑重承诺:将以饱满的热情投入工作,为同学们的中考保驾护航。
D.学校更换的干湿分类垃圾箱,是有效改善校园环境的举措。
湖南省长沙市青竹湖湘一外国语学校2019-2020学年初三第二学期入学考试数学试卷
沿 AE 折叠,使点 B 落在点 处.当 p ܧ为直角三角形时,p 的长为______.
18.已知 a﹣b=b﹣c= ,a2+b2+c2=1,则 ab+bc+ca 的值等于
.
三、解答题(本大题共 6 小题,19、20 每题 6 分,21、22 每题 8 分,23、24 每题 9 分,共 46 分)
AB=3,AD=4,则 ED 的长为( )
3
A.
2
B.3
C.1
4
D.
3
8.△ABC 的三边长分别为 a,b,c.下列条件,其中能判断△ABC 是直角三角形的个数有( )
①∠A=∠B﹣∠C ;②a2=(b+c)(b﹣c);
③∠A:∠B:∠C=3:4:5;④a:b:c=5:12:13
A.1 个
B.2 个
初二第二学期入学考试试卷
分值:100 分 时间:80 分钟 一、选择题(本大题共 12 题,每小题 3 分,共 36 分) 1. 下列各图中,为轴对称图形的是( )
A.
B.
C.
D.
2. 如图,已知 AB、CD 相交于 O 点,△AOC≌△BOD,E、F 分别在 OA、OB 上,要使△EOC≌△FOD,
的最小值?N 的最大值?
24.如图,四边形 ABCD 是正方形,△ABE 是等边三角形,M 为对角线 BD(不含 B 点)上任意一点,将 BM 绕点 B 逆时针旋转 60°得到 BN,连接 EN、AM、CM. (1)求证:△AMB≌△ENB; (2)①当 M 点在何处时,AM+CM 的值最小; ②当 M 点在何处时,AM+BM+CM 的值最小,并说明理由;
C.3 个
湖南长沙青竹湖湘一外国语学校2019-2020学年第二次月考初三化学试题(无答案)
青竹湖湘一外国语学校2019-2020学年度第二次月考初三化学问卷可能用到的相对原子质量:H-1 C-12 0-16 N-14 S-32 Cl-35.5 Na-23 I-127一、选择题(本大题共15小题,每小题3分,共45分。
每小题只有一个正确选项,请将正确选项填在答卷的相应表格内)1.下列有关净化水的方法中,涉及到化学变化的是(A)A.投药消毒B.蒸馏C.过滤D.活性炭吸附2.水的化学式为H2O,过氧化氢的化学式为H2O2关于这两种物质的叙述正确的是A.都含有氢分子B.组成元素的种类相同C.都含有两个氢原子D.都由氢原子和氧原子构成3.下列说法正确的是A.海水经煮沸后可直接饮用B.氢气的密度比空气小,易溶于水C.氢气具有可燃性,点燃之前一定要验纯D.水中氢、氧两种元素的质量比为2:14.工业上使用黄铁矿(主要成分为FeS2)经多步反应制取硫酸,其中第一步反应为:4FeS2+11O=高温=2X+8SO2,则X的化学式为A.Fe203B.FeOC.FeD.Fe3045.下列有关碳单质的说法中错误的是A.石墨有优良的导电性,可以用做电极B.因为碳原子排列方式不同,所以金刚石、石墨和C60的化学性质差异很大C.在一定条件下,石墨可转化为金刚石,这个变化是化学变化D.金刚石是天然存在的最硬的物质,可用来裁玻璃6.以下是某化学反应的微观示意图(○●分别表示不同元素的原子),下列对该反应的理解正确的是A.反应物和生成物中共含有三种元素B.参加反应的物质分子个数之比为1:1C.反应物和生成物中只有一种单质D.该反应前后两种元素的化合价一定发生了改变7.下列有关单质、化合物和氧化物的说法正确的是A.氧化物中一定含有氧元素,含有氧元素的化合物一定是氧化物B.由同种元素组成的物质一定是单质C.由不同种元素组成的物质一定是化合物D.化合反应的生成物一定是化合物8.下列化学符号中数字“2”表示的意义,正确的是A.CO2:表示二氧化碳中含有2个氧原子B.2Hg:表示2个汞原子C.2Mg表示一个镁离子带2个单位正电荷D.S2-:表示硫元素的化合价为-2价9.消毒剂高铁酸钠(Na2FeO4)集氧化、吸附、凝聚、杀菌等功能于一体,目前被广泛应用于自来水净化。
2020年青竹湖湘一外国语学校初三中考第二次模拟考试化学试卷
青竹湖湘一外国语学校2019-2020 学年度下学期第二次模拟考试初三化学问卷可能用到的相对原子质量:H-1 C-12 N-14 O-16 S-32 Na-23 Ca-40一、选择题(本大题共15 小题,每小题3 分,共45 分)1.下列事实中,属于物质化学性质的是()A.二氧化碳能使澄清石灰水变浑浊B.普通玻璃属于易碎品C.金刚石硬度大D.盛有水和植物油的试管振荡得到乳状浑浊液体2.下列关于空气成分的说法错误的是()A.空气的成分按体积计算,氧气约占21% B.干冰可作制冷剂C.食品包装中充入氮气防腐D.氧气能支持燃烧,因此氧气是一种理想燃料3.下图所示实验操作正确的是()A.测溶液的pH B.读出液体体积C.稀释浓硫酸D.移走蒸发皿4.下列有关分子、原子、离子和元素的说法中不正确的是()A.分子是由原子构成的B.原子是由原子核和核外电子构成的C.离子是带电的原子或原子团D.元素的化学性质主要由其原子的核外电子数决定5.2019 年10 月9 日下午,诺贝尔化学奖揭晓,约翰·古迪纳夫、M·斯坦利·威廷汉和吉野彰成为该年的诺奖得主,以表彰其在锂电池发展上所做的贡献。
下图为锂元素信息和锂原子结构示意图,锂电池放电时的化学方程式为Li+MnO2=LiMnO2.根据上述信息,下列说法错误的是()A.该反应属于化合反应B.反应前后Li 元素的化合价发生了变化C.该反应产物属于氧化物D.锂元素位于元素周期表第二周期6.下列有关水的说法正确的是()A 水体污染的来源主要有工业污染、农业污染和生活污染B.硬水和软水可用pH 试纸来区分C.有水生成的反应一定是酸和碱的中和反应D.活性炭能使海水转化为淡水7.煤气厂常在家用煤气(主要成分为一氧化碳)中掺入微量具有难闻性气味的乙硫醇(C2H5SH),以便泄漏时容易察觉。
家用煤气燃烧的产物中不可能有()A.CO2B.H2O C.SO2D.P2O58.下列有关碳和碳的氧化物的说法,错误的是()A.《清明上河图》至今图案清晰可见,是因为在常温下碳单质的化学性质稳定B.碳在空气中充分燃烧时生成CO2,不充分燃烧时生成COC.CO 和CO2的组成元素相同,所以它们的化学性质也相同D.CO 和CO2在一定条件下可以相互转化9.运用防灾、灭火、自救等安全知识判断下列做法不正确的是()A.炒菜时油锅着火,立即用锅盖盖灭B.发现燃气泄漏,立即打开排气扇通风C.眼睛里溅入药液,立即用水冲洗,切不可用手揉眼睛D.遭遇火灾,用湿毛巾捂住口鼻,蹲下靠近地面或沿墙壁跑离着火区域10.X、Y、Z 为三种金属,已知①X+H2SO4==XSO4+H2↑,②Y+2ZNO3==Y(NO3)2+2Z,③Y 与稀硫酸不反应。
湖南长沙青竹湖湘一外国语学校2019-2020年第二学期初三语文入学考试(无答案)
青竹湖2019 -2020学年第二学期初三语文考试时量150 分钟,满分150 分。
一、积累与运用(共26 分)1. 下列句子中,没有错别字并且加点字的注音完全正确的一项是()(2 分)A. 高原上的花朵,摇曳如泛滥的灯火,是高原人用心捧出的一枚枚火种,缭原,弥.(mí n漫),轻摇轻荡,平衡着高原的荒芜,将高原小城的面容照亮,即使再黑的夜,高原人都能提灯还家。
B. 从情感说,《古诗十九首》感情纯真诚挚,没有骄揉造作;从艺术表现说,它的写境用语好像都是信手拈来,没有错彩镂金式的加工。
就古代诗歌发展的实际而言,完全可以称它为“五言之冠.(guàn)冕"。
C. 中考倒计时100 天,父亲郑重其事地把倒计时日历交给我,我低下头,端祥着上面醒目的数字,暗暗下定决心,我一定要做好自己人生的主舵.(tu ó)手。
D. 那个孩子的鞠躬一直印在我的记忆里:他站在斑马线上,穿着肥大夹.(ji á)袄的小小身躯面向停在前方的公交车,挥手,弯腰,温暖了一车的乘客,更让我们看到了礼数传承、感思教育的珍贵。
2. 下列各句,加点词语使用不正确的一项是()(2 分)诗的格律可以学习,但诗的妙处却无法传授。
一个人要想写出好诗,只能靠自己静观玄思,融会贯通....,他人无能为力。
循着固有的道路,也许只会贻笑大.方...;按照公认的规律,最终可能竹篮打水一场空。
可以隐居,但未必能成为陶潜、王维;也可以参军,但成为高适、岑参的机会实在渺茫。
格律再谨严,也追不上王维的别.有.用.心.;酒喝得再多,也学不来李白的飘逸风流。
因此,玉.不.琢.不.成.器.,多琢磨是写好诗的唯一途径。
A 融会贯通 B.贻笑大方 C.别有用心 D.玉不琢不成器3. 下列句子没有语病的一项是()(2 分)A. 我们的先祖把能够驯化的物种进行培育、筛选,一定是依照口味进行的淘汰和选择。
B 初三阶段四次月考成绩告诉我们,要想提高成绩,必须紧跟老师,不断查漏补缺。
湖南省长沙市青竹湖湘一外国语学校2019-2020学年初三第二学期入学考试数学试卷
初二第二学期入学考试试卷分值:100分 时间:80分钟一、选择题(本大题共12题,每小题3分,共36分)1.下列各图中,为轴对称图形的是( )A .B .C .D .2.如图,已知AB 、CD 相交于O 点,AOC BOD △≌△,E 、F 分别在OA 、OB 上,要使EOC FOD △≌△添加的一个条件不可以是( )A .CE DF =B .CEA DFB ∠=∠C .OCE ODF ∠=∠D .OE OF =3.下列计算正确的是( )A .325235a a a +=B .326236a a a ⋅=C .623623a a a ÷=D .222(2)44a b a ab b --=++ 4.若实数x 满足2210x x --=,则322742017x x x -+-的值为( )A .2019B .2019-C .2020D .2020-5.下列根式中是最简二次根式的是( )A B C 0)a > D6.已知a )A .0B .3C .D .97.如图,将长方形纸片ABCD 折叠,使边DC 落在对角线AC 上,折痕为CE ,且D 点落在对角线D '处.若3AB =,4AD =,则ED 的长为( )A .32B .3C .1D .438.ABC △的三边长分别为a ,b ,c .下列条件,其中能判断ABC △是直角三角形的个数有( ) ①A B C ∠=∠-∠;②2()()a b c b c =+-;③::3:4:5A B C ∠∠∠=;④::5:12:13a b c = A .1个 B .2个 C .3个 D .4个9.如图,直线L 上有三个正方形a ,b ,c ,若a ,c 的面积分别为1和9,则b 的面积为( )A .8B .9C .10D .1110.如图,ABCD Y 的对角线AC ,BD 相交于点O ,AE EB =,3OE =,5AB =,ABCD Y 的周长( )A .11B .13C .16D .22 11.多项式22424x xy y x y --++分解因式后有一个因式是2x y -,另一个因式是( )A .21x y ++B .21x y +-C .21x y -+D .21x y --12.如图,将矩形ABCD 的一个角翻折,使得点D 恰好落在BC 边上的点G 处,折痕为EF ,若EB 为AEG ∠的平分线,EF 和BC 的延长线交于点H .下列结论中:①90BEF ∠=︒;②DE CH =;③BE EF =;④BEG △和HEG △的面积相等;⑤若2AD CD =,则56BG BC =.以上命题,正确的有( )A .2个B .3个C .4个D .5个二、填空题(本大题共6小题,每小题3分,共18分)13.若3x a =,2y a =,则2x y a +=_________.14.函数y =中自变量x 的取值范围是________.15.若ABC △的三边a 、b 、c ,其中1b =,且2(1)|0a c -+=,则ABC △的形状为________.16.若关于x 的方程2361mx m x x x x++=--无解,则m =________. 17.如图,矩形ABCD 中,3AB =,4BC =,点E 是BC 边上一点,连接AE ,把B ∠沿AE 折叠,使点B 落在点B '处.当CEB '△为直角三角形时,CB '的长为_________.18.已知35a b b c -=-=,2221a b c ++=,则ab bc ca ++的值等于_________. 三、解答题(本大题共6小题,19、20每题6分,21、22每题8分,23、24每题9分,共46分)19.计算(1+(2)解方程:224124x x x +-=-- 20.化简2214411x x x x x -+⎛⎫-÷ ⎪--⎝⎭,再从1-,0,1和2中选一个你认为合适的数代入求值. 21.如图,D 是ABC △的边AB 上一点,CE AB ∥,DE 交AC 于点F ,若FA FC =.(1)求证:四边形ADCE 是平行四边形;(2)若AE EC ⊥,5EF EC ==,求四边形ADCE 的面积.22.红旗连锁超市准备购进甲、乙两种绿色袋装食品.甲、乙两种绿色袋装食品的进价和售价如表.已知:用2000元购进甲种袋装食品的数量与用1600元购进乙种袋装食品的数量相同.(1)求m 的值;(2)要使购进的甲、乙两种绿色袋装食品共800袋的总利润(利润=售价-进价)不少于4800元,且不超过4900元,问该超市有几种进货方案?(3)在(2)的条件下,该超市如果对甲种袋裝食品每袋优惠(18)a a <<元出售,乙种袋装食品价格不变.那么该超市要获得最大利润应如何进货?23.阅读理解:在平面直角坐标系中,任意两点()11,A x y ,()22,B x y 之间的位置关系有以下三种情形; ①如果AB x ∥轴,则12y y =,12AB x x =-②如果AB y ∥轴,则12x x =,12AB y y =-③如果AB 与x 轴、y 轴均不平行,如图,过点A 作与x 轴的平行线与过点B 作与y 轴的平行线相交于点C ,则点C 坐标为()21,x y ,由①得12AC x x =-;由②得12BC y y =-;根据勾股定理可得平面直角坐标系中任意两点的距离公式AB =(1)若点A坐标为(4,6),点B坐标为(1,2)则AB=________;+最小值=_______;(2)若点A坐标为(3,3),点B坐标为(6,6),点P是x轴上的动点,直接写出AP PB(3)已知M=N=M的最小值?N的最大值?△是等边三角形,M为对角线BD(不含B点)上任意一点,24.如图,四边形ABCD是正方形,ABE将BM绕点B逆时针旋转60°得到BN,连接EN、AM、CM.△≌△;(1)求证AMB ENB+的值最小;(2)①当M点在何处时,AM CM++的值最小,并说明理由;②当M点在何处时,AM BM CM++的最小值为2时,求正方形的边长.(3)当AM BM CM。
2020年湖南省长沙市开福区青竹湖湘一外国语学校中考数学二模试卷及答案解析
第 1 页 共 23 页 2020年湖南省长沙市开福区青竹湖湘一外国语学校中考数学二模试卷一、选择题(本大题共12小题,共36分)1.(3分)中国人很早开始使用负数,中国古代数学著作《九章算术》的“方程”一章,在世界数学史上首次正式引入负数.如果收入100元记作+100元.那么﹣80元表示( )A .支出20元B .收入20元C .支出80元D .收入80元2.(3分)2020年1月17日国家统计局发布数据,初步核算,2019年我国国内生产总值超99万亿元,达到990865亿元,按可比价格计算,比上年增长6.1%,符合6%至6.5%的预期目标.分季度看,一季度同比增长6.4%,二季度增长6.2%,三季度增长6.0%,四季度增长6.0%.将99万亿元用科学记数法表示为( )元.A .99×1012B .99×1011C .9.9×1013D .99×10133.(3分)下列图形中,既是轴对称图形又是中心对称图形的是( )A .B .C .D .4.(3分)不等式组{−x ≤1x <3的解集在数轴上可以表示为( ) A . B .C .D .5.(3分)下列说法正确的是( )A .一个游戏的中奖概率是110 则做10次这样的游戏一定会中奖B .为了解全国中学生的心理健康情况,应该采用普查的方式C .一组数据 8,8,7,10,6,8,9 的众数和中位数都是8D .若甲组数据的方差S 2=0.01,乙组数据的方差S 2=0.1,则乙组数据比甲组数据稳定6.(3分)如图,△ABC 中,∠C =90°,AC =3,∠B =30°,点P 是BC 边上的动点,则AP 长不可能是( )。
青竹湖湘一外国语学校2019-2020学年度第二次模拟考试
青竹湖湘一外国语学校2019-2020学年度第二次模拟考试初三英语II.知识运用(两部分,共20小题,计20分)第一节语法填空从A、B、C三个选项中选择最佳答案填空。
(共10小题,计10分)21.You’d better make ________ clear when the plane will take off.A. thisB. thatC. it22.—Hey, Tony! Will you go to Moon Island Park with Jimmy tomorrow afternoon?—Oh, no. He’s so ________.A. boredB. boringC. bore23.— Did you finish the difficult task only in one day?— No. I rested ________ a night and finished it the next day ________ the help of the local people.A. at, withB. for, underC. for, with24.Emma was afraid of the dog when she was young. She would run away ________ she saw it.A. so thatB. as soon asC. ever since25.Keep moving forward even if you ________ fail hundreds of times before achieving your dream.A. shouldB. mayC. must26.He spends more time than he used to ________ books: That’s why he gets better grades now.A. hittingB. hitC. hits27.This watch ________ to me as my birthday present the other day and I will treasure it forever.A. will be givenB. is givenC. was given28.All of his works as well as his spirit always ________ the people to go through the hard times intheir lives.A. encourageB. encouragesC. is encouraging29.The engineer ________ my father works is about 50 years old.A. whoB. as whomC. with whom30.No one tells us ________, so we need your help.A. what to do itB. what should we doC. how to do it第二节词语填空通读下面的短文,掌握其大意,然后从题中所给的A、B、C三个选项中选出一个最佳答案。
湖南省长沙市青竹湖湘一外国语学校2019-2020学年初三中考第二次模拟考试英语试卷(word版)
2019-2020学年青竹湖湘一外国语学校初三中考第二次模拟考试英语试卷总分:120分时量:90分钟II. 知识运用(两部分,共20小题,计20分)第一节语法填空(共10小题,计10分)21.You’d better make ________ clear when the plane will take off.A. thisB. thatC. it22.— Hey, Tony! Will you go to Moon Island Park with Jimmy tomorrow afternoon?— Oh, no. He’s so ________.A. boredB. boringC. bore23.— Did you finish the difficult task only in one day?— No. I rested ________ a night and finished it the next day ________ the help of the local people.A. at, withB. for, underC. for, with24.Emma was afraid of the dog when she was young. She would run away ________ she saw it.A. so thatB. as soon asC. ever since25.Keep moving forward even if you ________ fail hundreds of times before achieving your dream.A. shouldB. mayC. must26.He spends more time than he used to ________ books: That’s why he gets better grades now.A. hittingB. hitC. hits27.This watch ________ to me as my birthday present the other day and I will treasure it forever.A. will be givenB. is givenC. was given28.All of his works as well as his spirit always ________ the people to go through the hard times intheir lives.A. encourageB. encouragesC. is encouraging29.The engineer ________ my father works is about 50 years old.A. whoB. as whomC. with whom30.No one tells us ________, so we need your help.A. what to do itB. what should we doC. how to do it第二节词语填空(共10小题,计10分)On a sunny afternoon, we went to a park to have fun. Some people were painting pictures, some were writing calligraphy, some were dancing on the square, and 31 were shooting arrows (射箭).I decided to try shooting arrows myself — it looked fun and 32 .I saw one woman 33 an arrow and shoot it after taking a moment to aim. The arrow curved (飞出弧线) 34 the air beautifully. But it finally fell to the ground and missed the target (目标).It seemed that she didn’t put enough power into her shot. While I was thinking about what I should do, it was my turn to shoot. I focused my eyes on the target and shot the arrow with all my strength. But the arrow missed the target, and 35 stuck straight in the grass. I shot three more times, but ended up missing all of them.Feeling 36 I walked away without saying a word. Angela stopped me, and said while patting my shoulder, “Hey, don’t worry about it! Just try one more time, OK? You can do it!” Her bright smile 37 me. After hearing this, I decided to take one more shot. I took a deep breath and put one foot forward to keep the 38 . I focused hard on the target and shot the arrow. This time, I hit the target!As I went to get my arrows, I 39 that there are many things in life, big and small, that are not as simple as we imagine. There are challenges everywhere. But if we focus on one thing at a time and learn from our 40 , we can succeed in the end.31. A. the other B. others C. other32. A. interesting B. surprising C. challenging33. A. pick up B. take up C. set up34. A. across B. through C. onto35. A. instead B. still C. even36. A. regretful B. nervous C. upset37. A. attracted B. encouraged C. praised38. A. position B. promise C. strength39. A. heard B. noticed C. realized40. A. mistakes B. failures C. accidentsIII. 阅读技能(共三节,共24小题,计48分)第一节图表理解(共5小题,计10分)A41.The museum is open for only five hours on ________.A. ThursdaysB. SaturdaysC. Sundays42.Lisa will be free from December 23rd (Sunday) to December 27th. She plans to visit the museumduring these days. She can ________.A. visit the museum without paymentB. visit the museum any day except on December 25thC. send an e-mail to ask for more information about the museumB43.A. rest your wrists on your lapB. rest your elbows on the tableC. tear the bread into pieces and eat44.Which of the following is TRUE about the Japanese table manners?A. Drinking directly from the soup bowl is uncommon.B The Japanese are strict about using chopsticks while eating.C. The guests are always only served with noodles and soup.45.The chart above mainly tells readers ________ in different countries.A. how to behave at tableB. whether to tip waitersC. what to do at a party第二节短文阅读(共10小题,计20分)AI am so worried about my son’s health that I can’t help writing to you. last night, a school night, my 11-year-old son’s baseball team played a game that lasted until 9:30. By the time we got home and he had a quick dinner and shower, it was 10:30 - an hour and a half later than a child who gets up at 6:30 should be going to bed. We love baseball. My son is having tun, getting exercise, and learning patience, teamwork and sports spirit. But the truth is that the game also influences his sleep.As parents, we want good things for our children. We want them to be healthy both in body and in mind. To this end, we look for ways to help our kids grow and develop. We help them with their homework. We send them to all kinds of classes - dance, soccer and baseball. We encourage our kidsto take honors courses (培优课程) or to have after-school jobs. And we praise them for hard-earned success and achievementsHowever, the ironic thing is that all of these activities and responsibilities that we are giving our children to make their lives colorful could be badly influencing their health and taking happiness away. Activities, responsibilities, and goals are good. But if we want our kids to realize their full physical, learning and social ability, sleep is important We have to start taking sleep seriously.Parents make bedtime routines and carry out strict rules about nighttime. But in fact, these measures (措施) aren’t enough because getting our kids enough sleep isn’t just about carrying out (实行) stricter bedtime. It actually requires more than that. In order to ensure our kids get the sleep they need, both parents and schools should make an effort.46.Which of the following statements is TRUE according to the first paragraph?A. The writer’s son spent too much time taking a shower.B. The kid who gets up at 6:30 am should go to bed at 8:30 pm.C. The writer’s son learns a lot and has a good time in the baseball team.47.From Paragraph 2, we know that parents ________.A. want the best for their childrenB. are able to teach their children to dance at homeC. pay more attention to children’s mind than body48.What’s the best meaning of the underlined word “ironic” in the third paragraph?A. 讽刺的B. 公平的C. 奇特的49.From the passage, we can infer that ________.A. activities and responsibilities are sure to make children unhealthy and unhappyB. not only parents but also schools haw made efforts to help kids get enough sleepC. some children may not have enough sleep because of too many after-school activities50.What might happen if the headmaster read this letter?A. More after-school classes might be given to students.B. The school might make some rules to make sure students go to bed early.C. Parents might be advised to make their children’s lives more colorful.BWhat’s the first thing that you notice when passing your favorite restaurant? The smell of fresh pizza? Or the sight of your favorite desserts? Food that looks and smells good will probably taste good,but what about sound?Scientists now believe that the taste of food can change when you hear different sounds, but it has to be the right sound. When you mm on a microwave with popcorn in it, it soon starts to pop. Do you think “That sounds tasty!”? Not really, you probably think it’s nearly ready. But when you smell it, you know it is delicious. Hearing the popcorn makes you think about it, but smelling it tells you that it tastes good. So what are the sounds to change the tastes of the things?In an experiment in a fish restaurant, customers listened to the sound of the seaside while eating. Did it make a difference? Yes. Listening to the seaside seemed to improve the taste of the food. It was fresher and saltier. When the restaurant tried the same experiment with the sound of the farm animals, there was no difference in taste. The results are useful for restaurants. Perhaps they will use fewer unhealthy things like sugar and salt in food. With the right music or sounds, we won’t taste the difference.Restaurants are also setting a connection between food and the sound that the packet makes. Pick up a packet (包装袋) of potato chips, what does it sound like? Experiments show that the packet making a right sound will make customers think the potato chips are fresher So one restaurant recently changed the material that they used to make their potato chip packets. Another idea is that a list of music will begin to appear on food packets, so if you don’t like your green vegetables, the right music or sounds could help you learn to love them.51.What can NOT attract people to enter a restaurant according to paragraph one?A. Excellent cooking for pizza.B. Pretty food on the menu.C. Delicious smell of a dish.52.What can you learn from the second paragraph?A. Different sounds can change the taste of food.B. The popping sound of popcorn means tasty popcorn.C. With delicious smell, you know you can eat the popcorn.53.If you run a seafood restaurant, you may play ________ to improve the taste of the food.A. a list of pop musicB. the sound of wavesC. the sound of farm animals54.The material of the food packet is important because the customers ________.A. want it to look rightB. enjoy looking at the different materialsC. think the food is good if it makes the right sound55.What could be the best title of the passage?A. Right Sound, Good TasteB. Enjoy Music While EatingC. Magical Sounds of Packets第三节语篇补全(共4小题,计8分)In the 13th century, Marco Polo, the world known Italian traveller, saw many wonderful things in China. One of the things he discovered was money made of paper. People in the West did not have such kind of money until the 15th century. 56. ________Paper was invented by a Chinese man called Cai Lun almost 2,000 years ago. But it was not made in Europe until the year 1100. Hour hundred years later, a German discovered that he could make the best paper from trees. 57. ________Paper can be used in many ways. The common uses include newspapers, magazines and books. But do you know that paper can be used for keeping warm? In Finland, the farmers wear paper boots to keep their feet warm in the snow. And even houses can be insulated (使绝缘的) from heat or cold with paper.However, we have to understand that paper still comes from trees now. 58. ________ Every day people throw away about 2,800 tons of paper in our city. It takes 17 trees to make one ton of paper. This means that we are cutting down nearly 48,000 trees every day. The fact is that it takes more than 10 years for a tree to grow.59. ________ We can use both sides of every piece of paper. We can make useful things out of used paper. We can use china cups instead of paper ones. When shopping, we can use fewer paper bags and reuse them if we have some.In short, we should keep a balance (平衡) between using paper and protecting trees, and do it now before it is too late.第四节阅读表达(共5小题,计10分)It was a room full of boys. A girl, about 10 years old, was sitting in the center. She was the only girl among the boys. As a tradition in her village, other girls had to stay home.The girl, Shameem Akhtar, was born in a small village in Pakistan (巴勒斯坦). In her village, allparents keep girls inside their homes. Luckily, Shameem’s uncle, a university graduate, wanted to give her a chance to see the world. He offered Shameem a chance to attend school. However, Shameem had to fight to complete her schooling. To be allowed to enter college, she stopped eating for 3 days, which is called a hunger strike (抗议).After graduating from college, Shameem got a position in a non -profit (非营利性的) organization aiming to help women in rural (农村的)areas. There, she saw a Pakistan that she didn’t know. Until then, she thought she had a difficult life. But there, she saw what women in other parts of Pakistan were experiencing. Some women had 11 children, but nothing to feed them. To get water, they would walk three hours every day to get to the wells (水井). Shameem found that the position was more than just a job for her. She discovered her power. By setting an example, her experience could encourage more people to understand the importance of education and send their daughters to school.Now, Shameem teaches in a rural school in her hometown. “The first day I walked into the school” she said, “I saw all these little Shameem looking at me with dreams in their eyes, the same dream of freedom which I had in my childhood.”Today, there is not a single girl in her village who doesn’t go to school60.Why couldn’t other girls attend school when Shameem was young?_____________________________________________________________________________ 61.Who helped Shameem achieve her dream to go to school?_____________________________________________________________________________ 62.How was the women’s life in other parts of Pakistan?_____________________________________________________________________________ 63.Where does Shameem work now?_____________________________________________________________________________ 64.Are the girls allowed to go to school in Shameem’s hometown now?_____________________________________________________________________________IV. 写作技能(三部分,共11小题,计32分)第一节语篇翻译(共5小题,计10分)May is the best month in my mind. 65. It is a beautiful month full of sunlight and colorful flowers. It is also the month when we show appreciation (感激) for our mothers on Mother’s Day.In my family, every year’s celebration is different. Two years ago, I made breakfast for my mom and she still remembers all the dishes I cooked. 66. Last year. I bought her a scarf with the money thatI made from selling some of my old books. She still uses it all the time.My mom is my hero and she sacrificed (牺牲) her career in order to take care of me. I wanted to do something special on this “quarantined” (隔离) Mother’s Day. 67. 在四月份,我开始在网上寻找关于礼物的不同的想法。
2023年湖南省长沙市开福区青竹湖湘一外国语学校中考二模语文试题
2023青一九下二模一、积累与运用(18分)1.下面是某同学做的字音字形梳理记录,其中有错误...的一项是()A.注意纠正因为方言发音造成的误读,如:“糯(luò)米”应读成“糯(nuò)米”,“恒(hén)心”应读成“恒( héng )心”。
B.注意纠正姓氏、古代官名的误读,如:“贾(gǔ)平凹”应读成“贾(jiǎ)平凹”,“士大(dài)夫”应读成“士大(dà)夫”。
C.注意因音近或形似造成的误写,如:“峭壁”不能写成“峭璧”,“惴惴不安”不能写成“揣揣不安”。
D.注意成语字形的误写,如:“茅塞顿开”应写成“毛塞顿开”,“千锤百炼”应写成“千锤百练”。
2. 下面是中考倒计时20天初三某同学写给同桌的寄语,加点词使用不当..的一项是()我们都希望梦想成真,然而世上从来没有唾手可得....的成功。
实现远大的梦想要像一棵大树,深入地下锲而不舍....地生长。
无论遇到多么大的阻力,都要告诉自己世上无难事.....,只怕有...心人..。
只有日复一日地执着奔跑,才会与梦想不谋而合....。
A. 唾手可得B. 锲而不舍C. 世上无难事,只怕有心人D. 不谋而合3.下面是某同学的摘抄,其中有语病...的一项是()中国人的红色情结流动在民族的血脉里。
①中国历代帝王偏爱红色,因为红色能显示皇帝的权威。
②战场上,红色的旗帜能召唤将士们勇往直前、不畏牺牲的精神。
③过年,家家户户都会沿用古代贴红纸、点红灯笼、发红包等;④金榜题名时,红色的榜单意味着成功与光荣。
A.①B.②C.③D.④4.下面表达不得体...的一项是()A. 电梯间里,邻居李叔叔踩到了你的脚,他连忙道歉,你幽默地回应:“没事的,李叔叔,是我占了您的地儿。
”B. 作为志愿者,你在五一广场交通路口进行文明劝导,看到闯红灯过马路的行人,你说:“您好!为了您的安全,请您等待绿灯亮起时再过马路好吗?”C. 你去邀请老师参加班级毕业照拍摄,说:“亲爱的老师,同学们很想将您定格在我们记忆里,拍毕业照那天您能来吗?”D. 当你刚把走廊打扫得干干净净,一位同学走过便丢下一片纸屑,你说道:“你懂不懂珍惜他人的劳动成果?快把纸屑捡起来!”5.根据表格内容进行探究,下列表述错误..的一项是()作品创作时间创作背景《秋词(其一)》805年-815年间刘禹锡参加革新运动失败被贬为朗州司马。
2019—2020—2青竹湖初三第二次月考数学试卷
长沙市青竹湖湘一外国语学校年下学期第二次月考九年级数学试题时量:分钟分值:分一、选择题(本大题共小题,共分)1.下列各数中,比小的数是()A.B.C.D.2.下列各式中,运算正确的是()A.B.C.D.3.某市今年累计向多名贫困学生发放资助资金约万元,此数据用科学记数法表示为()元A.B.C.D.4.抛物线的顶点坐标是()A.B.C.D.5.如图所示,直线,,,则的大小是()A.B.C.D.第5题图第6题图第7题图6.服装店上月不同尺码的衬衫平均每日销售情况统计如图所示,本周进货时,店主决定增加码衬衫的进货量,影响该店主决策的统计量是()A.平均数B.中位数C.众数D.方差7.如图所示是某几何体的三视图,根据图中数据计算,这个几何体的侧面积为()A.B.C.D.8.如图,在山坡上种树,坡度,,则相邻两树的水平距离为()A.B.C.D.9.今有人合伙购物,每人出钱,会多钱;每人出钱,又差钱,问人数、物价各多少?设有人,商品的价格为,依题意可列出方程组为()A.B.C.D.10.如图,一艘海轮位于灯塔的北偏东方向的处,已知海里,如果海轮沿正南方向航行到灯塔的正东方向,则海轮航行的距离的长是()A.海里B.海里C.海里D.海里第10题图第11题图第12题图11.如图,在中,,分别以点、为圆心,大于长为半径画弧,在两侧分别交于、两点,直线交于点,交于点,若,,则的长为()A.B.C.D.12.已知:如图,在直角坐标系中,有菱形,点的坐标为,对角线、相交于点,反比例函数经过点,交的延长线于点,且,则点的坐标是()A.B.C.D.二、填空题(本大题共小题,共分)13.单项式的系数是;14.分解因式:;15.为了估计虾塘里海虾的数目,第一次捕捞了只虾,将这些虾一一做上标记后放回虾塘,几天后,第二次捕捞了只虾,发现其中有只虾身上有标记,则可估计该虾塘里约有只虾;16.如图,在中,点、分别为边、的中点,的平分线交线段于点,若,,则线段的长为;第16题图第18题图17.已知、是关于的方程的两个实数根,则的最大值为;18.如图,在平面直角坐标系中,已知四个定点、、、,点在四边形内,则到四边形四个顶点的距离的和最小时的点的坐标为.三、计算题(本大题共小题,共分)19,计算:.20.先化简,再求值:,其中.21.何老师对某班部分学生进行了学习情况的跟踪调查,并将调查结果分成四类:、特别好,、好,、一般,、较差;并将调查结果绘制成以下两幅不完整的统计图,请你根据统计图解答下列问题:(1)本次调查中,何老师一共调查了名同学,其中女生共有名;(2)将上面的条形统计图补充完整;(3)为了共同进步,何老师想从被调查的类和类学生中分别选取一位同学进行“一帮一”互助学习,请用列表法或画树形图的方法求出所选两位同学恰好是一位男同学和一位女同学的概率.22.如图,是的直径,,为上的一点,,延长交的延长线于点.(1)求证:为的切线;(2)若,,,求图中阴影部分的面积.(结果保留)23.商社电器从厂家购进了、两种型号的空气净化器,已知一台型空气净化器的进价比一台型空气净化器的进价多元,用元购进型空气净化器和用元购进型空气净化器的台数相同.(1)求一台型空气净化器和一台型空气净化器的进价各为多少元?(2)商社电器计划型空气净化器的进货量不少于台且是型空气净化器进货量的三倍,在总进货款不超过万元的前提下,试问有多少种进货方案?24.定义:我们知道,四边形的一条对角线把这个四边形分成了两个三角形,如果这两个三角形相似(不全等),我们就把这条对角线叫做这个四边形的“相似对角线”.图1图2图3(1)如图1,已知四边形在正方形网格中,顶点都在格点上,判断:四边形(填“是”或“不是”)以为“相似对角线”的四边形;(2)如图2,是四边形中,,,对角线平分,求证:是四边形的“相似对角线”;(3)如图3,已知是四边形的“相似对角线”,,连接,若的面积为,求的长.25.已知抛物线:的顶点在定直线上.(1)求点的坐标(用含的式子表示);(2)求证:不论为何值,抛物线与定直线的两交点间的距离恒为定值;(3)当的顶点在轴上,且与轴交于、两点(点在点左侧)时,在上是否存在两点、,设交线段于点,使,且直线将的面积分成的两部分?若存在,求出直线的解析式,若不存在,请说明理由.26.如图,已知抛物线与轴交于、两点(点在点的左侧),与轴交于点,抛物线的对称轴与轴交于点.(1)请直接写出、两点的坐标及的度数;(2)如图1,若点为抛物线对称轴上的点,且,求点的坐标;(3)如图2,若点、分别为线段和上的动点,且,过、分别作轴的垂线,垂足分别为、,在、两点的运动过程中,试探究:①是否是一个定值?如果是,请求出这个定值,如果不是,请说明理由;②若将沿着翻折得到,将沿着翻折得到,当点从点运动到点的过程中,求点和点的运动轨迹的长度之和.图1图2。