九年级半期试题
九年级上学期半期考试数学试题 试题

江北中学2021届九年级上学期半期考试数学试题 新人教版本卷贰O 贰贰年贰月捌日编写; 出题人:令狐学复;欧阳化语;令狐理总。
(全卷一共五个大题 满分是150分 考试时间是是120分钟)温馨提示:1. 本套试卷分试题卷、答题卷;2. 在答题卷上....清楚准确填写上好班级、姓名和准考证号;3. 在考试完毕之后将答题卷按要求放于桌面上.一、选择题: 〔本大题10个小题,每一小题4分,一共40分 〕在每个小题的下面,都给出了代号为A 、B 、C 、D 的四个答案,其中只有一个是正确的,请将正确答案的代号涂在答题卷中对应的位置.1.以下计算正确的选项是 〔 〕A .2+3= 5B .32-22=1C .2×3= 6D .24÷6=4 2.假如a 是实数,以下各式一定有意义的是〔 〕.A .aB .21aC . 122+-a aD .2a -3.如图,DE 是ΔABC 的中位线,那么ΔADE 与ΔABC 的周长之比是〔 〕 A .1:1 B .1:2C .1:3D .1:44.实数a 22(4)(11)a a --化简后为〔 〕 A. 7 B. -7 C. 2a-15 D. 无法确定5.关于x 的一元二次方程01)1(22=-++-a x x a 的一个根是0,那么a 的值是〔 〕A .1B .1-C .1或者1-D .6.如下图,圆的直径是正方形边长的一半,圆位于正方形的内部.现随意地将飞镖掷 向正方形内,那么飞镖击中圆面局部的概率是〔 〕 A .12 B .14 C .π4 D . π167.在Rt△ABC 中,∠C=90°,AB=5,BC=2,那么cosA 的值是〔 〕A .215 B .25 C .212D .528.假设x 2+x-1=0,那么代数式x 3+2x 2-7的值是〔 〕A .6B .8C .8-D . 6-9.假设α、β是一元二次方程0132=-+x x 的两个根,那么βαα-+22的值是〔 〕 A .-2 B .-0.5 C .0.25 D .410.以下图形都是由同样大小的等边三角形按一定的规律组成,其中,第①个图形中一一共有3根小棒,第②个图形中一一共有9根小棒,第③个图形中一一共有18根小棒,……,那么第⑥个图形中小棒的根数为( )① ② ③A .60B .63C .69D .72二、填空题:〔本大题6个小题,每一小题4分,一共24分〕请将答案填写上在答题答题卷中对应的位置.11.当x =2时,x 212-的值是 . 12.假如572zy x ==,0≠xyz ,那么=-++y x z y x 3___________. 13.如图,在平行四边形ABCD 中,AF 交DC 于E ,交BC 的延长线于F ,假设EC AB = 13, AD =4厘米,那么CF = 厘米.14.如图:这是圆桌正上方的灯泡〔看作一个点〕发出的光线照射桌面后,在地面上形成阴影〔圆形〕的示意图,桌面的直径为1.2米,桌面间隔 地面1米,假设灯泡间隔 地面3米,那么地面上阴影局部的面积为 m 2.15.十张正面分别标有数字3,2,1,0,1,2,3,4,5,6---的不透明卡片,它们除数字不同外其余全部一样。
九年级政治半期考试试题

1(时间:45分钟 满分:50分)一、单项选择题(每小题2分,共20分)1.某校九年级的学生把对我国社会主义初级阶段的有关认识,编成了如下几句顺口溜。
其中不正确的是( )A.初级阶段不发达,生产力水平比较低B.初级阶段有发展,日新月异成就大C.初级阶段很简单,就是经济发展慢D.人口素质不算高,科技水平需赶超 2、国家统计局2013年7月15日发布初步核算数据,上半年中国国内生产总值为248 009亿元,按可比价格计算,同比增长7.6%;神舟系列火箭发射成功;“蛟龙号”深潜成功;成功举办“世博会”“亚运会”;京沪高铁全线铺通……我国取得上述成就的根本原因是( )A.坚持了党在社会主义初级阶段的基本路线B. 坚持了中国特色社会主义道路和中国特色社会主义理论体系 C 坚持了科学发展 D.坚持了改革开放 3.下列选项中属于我国国有经济的是( )A.肯德基连锁店B.陈雨自己开的杂货铺 C 孙跃就职的镇办饲料加工厂 D. 航空航天工业 4.下面漫画反映了()①在市场经济条件下,公有制经济和非公有制经济平等竞争、互相促进 ②公有制经济与非公有制经济的地位、作用完全一样 ③非公有制经济已成为推动我国经济发展的主导力量 ④我国坚持公有制为主体、多种所有制经济共同发展的基本经济制度A.②③B.②③④C.①④D.①②④5.在每年3月的全国人大会议上,国务院总理都要作《政府工作报告》。
国务院总理向全国人大作《政府工作报告》表明全国人大( )①是我国的最高国家权力机关 ②是我国的最高国家行政机关 ③具有最高监督权 ④具有最高立法权A.①③B.①④C.②③D.②④6.为深入推进民族团结教育进校园,某地在学校开展“民族团结歌曲进校园”活动。
对维护民族团结下列说法不正确的是( )A.维护民族团结,必须做到尊重各民族的风俗习惯、宗教信仰和语言文字B.破坏民族团结的话不说,破坏民族团结的事不做;C.关心帮助少数民族同学D.为避免习俗冲突,互不往来7.“神州吹遍改革风,百花齐放;小富带动大家富,万紫千红。
2023-2024学年重庆市江津中学校九年级上学期期中考试英语试题(含答案,无听力原文及音频)

江津中学初2024级初三(上)半期考试英语试题(全卷共九个大题满分:150分考试时间:120分钟)第Ⅰ卷(共95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。
()1.A.By subway.B.By speaking.C.It’s far.()2.A.On Saturday.B.Once a week.C.Ten minutes.()3.A.Never mind.B.You are welcome.C.I’m sorry.()4.A.It’s late.B.It’s mine.C.It’s meaningful.()5.A.Yes, please.B.OK, I will.C.You’re welcome.()6.A.Nothing much.B.Not really.C.Thanks a lot.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。
()7.A./kʌp/.B./kæp/.C./ʌp/.()8.A.Alice’s mother.B.Alice’s brother.C.Alice.()9.A.By train.B.By car.C.By bus.()10.A.4:45.B.5:00.C.5:15.()11.A.Excited.B.Worried.C.Moved.()12.A.B.C.第三节(每小题1.5分,共6分)听两遍。
根据你所听到的长对话,从A、B、C三个选项中选出正确答案。
听第一段材料,回答第13和14小题。
()13.What is the relationship between the two speakers?A.Husband and wife.B.Brother and sister.C.Mother and son.()14.What housework will the boy do today?A.Tidying up his bedroom.B.Washing his clothes.C.Setting the table.听第二段材料,回答第15和16小题。
九年级数学半期

绵阳外国语实验学校2024秋九年级数学半期本试卷分试题卷和答题卷两部分,其中试题卷由第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)组成,共8页;试题卷共4页,答题卷共4页。
满分150分,考试时间120分钟,考试结束后将答题卡交回。
第Ⅰ卷(选择题共36分)一、选择题:本大题共12小题,每小题3分,共36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.下列方程中,属于一元二次方程的是()A.3x﹣2=0 B.2x2﹣x+1=0 C.D.4xy=02.一元二次方程3x2﹣5x﹣4=0的二次项系数、一次项系数、常数项分别是()A.3,﹣4,﹣5 B.3,5,4 C.3,﹣5,﹣4 D.3,5,﹣43.抛物线y=﹣3x2﹣4的开口方向和顶点坐标分别是()A.向下,(0,﹣4)B.向下,(0,4)C.向上,(0,4)D.向上,(0,﹣4)4.要由抛物线y=2x2得到抛物线y=2(x+1)2﹣3,则抛物线y=2x2必须()A.向右平移1个单位,再向上平移3个单位B.向左平移1个单位,再向下平移3个单位C.向右平移1个单位,再向下平移3个单位D.向左平移1个单位,再向上平移3个单位5.已知二次函数y=(x+1)2﹣2的图象上有三点A(1,y1),B(2,y2),C(﹣2,y3),则y1,y2,y3的大小关系为()A.y1>y2>y3B.y2>y1>y3C.y3>y1>y2D.y3>y2>y16.如图,某小区计划在一块长为32m,宽为20m的矩形空地上修建三条同样宽的道路,剩余的空地上种植草坪,使草坪的面积为570m2.设道路的宽为x m,则下面所列方程正确的是()A.(32﹣x)(20﹣x)=32×20﹣570B.32x+2×20x=32×20﹣570C.(32﹣2x)(20﹣x)=570D.32x+2×20x﹣2x2=5707.把方程x2+32x+4=0左边配成一个完全平方式后,所得方程是()A.(x+34)2=5516B. (x+34)2=−154C. (x+34)2=154D. (x+34)2=−55168.劳动节将至,某班全体学生互赠贺卡,共赠贺卡1980张,问该班共有多少名学生?设该班有x名学生,那么所列方程为()A. x(x+1)=1980B. x(x−1)=1980x(x−1)=1980 D. x2=1980C. 129.方程x2+3x−6=0与x2−6x+3=0所有根的乘积等于()A.−18B. 18C. −3D. 310.流感是一种传染性极强的疾病,如果有一人患病,经过两轮传染后有64人患病,设每轮传染中平均一个人传染了x个人,下列等式正确的是()A.x2+x(1+x)=64 B.1+x+x2=64C.(1+x)2=64 D.x(1+x)=6411.函数y=x2+bx+c与y=x的图象如图所示,以下结论:①b2﹣4c>0;②b+c=0;③若二次函数图象上两点(x1,y1),(x2,y2)满足x1<x2<1,则y1>y2;④当1<x<3时,x2+(b﹣1)x+c<0.其中正确的有()个.A.4 B.3 C.2 D.112.已知二次函数y=ax2+bx+c(a≠0)的图象如图,下列5个结论:①abc<0,②3a+c>0,③4a+2b+c<0,④2a+b=0,⑤b2>4ac.其中正确的结论有()A.2个B.3个C.4个D.5个(第11题)(第12题)第Ⅱ卷(非选择题共114分)二、填空题:本大题共6个小题,每小题4分,共24分。
九年级语文第一学期半期检测试题附答案

九年级语文第一学期半期检测试题(本卷总分:150分,时间150分钟)班级姓名得分一、语言积累运用(8分)1、下列词语中加点字的注音全对的一组是()(2分)A、恣睢.wãi 牡蛎.lì栈.桥jiàn 鞭笞.chīB、睾.肾gāo 枘凿.záo骈.进pián 拮据.jūC、煞.白shà愕.然â嗤.笑cī谀.词yíD、扶掖.yâ襁.褓qiáng 恐吓.xià霹雳.lì2、下列词语书写完全正确的一项是()(2分)A、言行相顾断章取义强聒不舍心无旁骛B、神情恍忽荡然无存花团锦簇棱角分明C、铬尽职守自之知明恼羞成怒重蹈覆辙D、一抔黄土涕泗横流怒不可遏歇斯底理3、依次填入下列空格处最恰当的一项是()(2分)①每当夜间疲倦,正想偷懒时,仰面在灯光中他黑瘦的面貌。
②周瑜之所以被诸葛亮“气死”,归根到底在于周瑜气量狭小,不肯。
③城管部门要增强城市管理工作的责任感,切实好城市管理工作的重要职责。
④乐山作为旅游城市,以其的人文景观和绚丽的自然风光吸引着国内外的游客。
A.瞥见甘拜下风履行丰富B.瞧见惟命是从奉行丰富C.瞧见甘拜下风奉行丰厚D.瞥见惟命是从履行丰厚4、下列作家作品知识搭配有误的一项是()(2分)A、《傅雷家书两则》——傅雷——《傅雷家书》《敬业与乐业》——梁启超——《饮冰室合集》B、《我的叔叔于勒》——莫泊桑——《羊脂球》《孤独之旅》——曹文轩——《草房子》C、《谈读书》——马南邨——《短文两篇》《中國人失掉自信力了吗》——鲁迅——《呐喊》D、《心声》——黄蓓佳——《儿童时代》《雨说》——郑愁予——《郑愁予诗的自选I》二、语文素养(23分)5、填空(5分)①、小说和议论文的三要素分别指的是:、、;、、。
②、“四书”指的是:、、、。
6、根据下面语境,为空格处选择合适的词语,将成语写在横线上。
四川省成都市金牛实验中学2024-2025学年九年级上学期期中考试语文试题(无答案)

2024—2025学年度上期九年级语文半期考试A卷(共100分)第Ⅰ卷(选择题共24分)一.基础知识(每小题3分,共12分)1.下列加点字注音有误的一项是( )A.嗤笑(chī)发怔(zhèng)拮据(jū)恣睢(zì)B.煞白(shà)豢养(juàn)停滞(zhì)筵席(yàn)C.岔气(chà)作揖(yī)拜谒(yè)逞能chěngD.眺望(tiào)星宿(xiù) 愧赧(nǎn)纶巾guān2.下列语句中书写有误的一项是( )A.我一直盯着父亲,看他郑重其是地带着两个女儿和女婿向那个衣服褴褛的年老水手走去。
B.要论中国人,必须不被搽在表面的自欺欺人的脂粉所诓骗,却看看他的筋骨和脊梁。
C.有人说:山穷水尽,走投无路,陷入绝境,等死而已,不能创造。
D.怀疑不仅是消极方面辨伪去妄的必须步骤,也是积极方面建设新学说、启迪新发明的基本条件。
3.下列句子中,加点词语使用不恰当的一项是()A.在人类已知的探险活动中,很多壮举都并非一蹴而就,往往需要很多人前仆后继才能完成。
B.他的大名在音乐界早已如雷贯耳,全世界的爱乐者几乎无人不知无人不晓。
C.犯罪嫌疑人在屡次偷盗不成后,仍然孜孜不倦地寻求更有效的盗窃手段。
D.这种对权威的盲目服从在他心中已经根深蒂固,任何人都无法改变他的态度。
4.下列语句中没有语病的一项是()A.秋分时节,亚洲各国的体育健儿相聚西子湖畔,携手奏响“同爱同在同分享”的激昂旋律,共同谱写了和平、友谊、进步。
B.《时光画师》之所以能打动人,是因为故事根植于本土文化,同时又有人性和普世的一些情怀的原因。
C.祖国对我们的爱并不抽象,它蕴含在每一滴汗水中。
D.我们要加强考古工作和历史研究,让收藏在博物馆里的文物、书写在古籍里的文字都活起来。
二.文言文阅读(每小题3分,共12分)甲若夫日出而林霏开,云归而岩穴暝,晦明变化者,山间之朝暮也。
重庆市四川外语学院重庆第二外国语学校2024一2025学年上学期 九年级半期质量监测数学试题
重庆市第二外国语学校2024—2025学年上期初2025级半期质量监测数学试题(全卷共三大题满分:150分 考试时间:120分钟)注意事项:1.试题的答案书写在答题卡上,不得在试题卷上直接作答;2.作答前认真阅读答题卡上的注意事项;3.作图(包括作辅助线)请一律用黑色2B 铅笔完成;4.考试结束,由监考人员将试题卷和答题卡一并收回.参考公式;抛物线的顶点坐标:,对称轴:直线一、选择题:(本大题10个小题,每小题4分,共40分)。
在每个小题的下面,都给出了A 、B 、C 、D 四个答案,其中只有一个是正确的,请将答题卡上题号右侧正确答案所对应的框涂黑.1.如图是五个小立方块组成的一个几何体,其主视图是( ).A. B. C. D.2.如图,在中,,,则( ).A.3.如图,点是反比例函数在第一象限内的图象上任意一点,过点A 作轴于点B ,若的面积是1,则k 的值是( )A.1B.-1C.2D.-2()20y ax bx c a =++≠24,24b ac b a a ⎛⎫-- ⎪⎝⎭2b x a =-Rt ABC △90C ∠=︒30A ∠=︒sin A =12()0k y k x=≠AB x ⊥OAB △4.如图,和是以点O 为位似中心的位似图形,点A 在线段上,若,则和的周长之比为( )A.1:2B.1:3C.1:4D.1:95.下列性质中,菱形具有而矩形不具有的是( ).A.对角线平分一组内角 B.对角线相等C.对角线互相平分D.对边平行且相等6.在一个箱子内放有同种规格的白球和红球若干个,已知白球有20个,搅匀后多次重复随机摸取,若摸到白球的频率为0.2,则箱子内的红球大约有( ).A.80个B.98个C.100个D.120个7.若a ,b 是方程的两根,则( ).A.-2030B.2030C.-2018D.20188.矩形ABCD 和矩形CEFG 按照如图所示位置摆放,其中点B ,C ,G 共线,点E ,D ,C 共线,连接AF ,点H 是AF 的中点,连接DH ,若,,则DH 的长( ).A.1B.0.5D.9.一次函数与二次函数在同一平面直角坐标系中的图象可能是( ).A. B. C. D.10.定义:已知,是关于x 的一元二次方程的两个实数根,若,且ABC △111A B C △1OA 1:1:3OA OA =ABC △111A B C △2320240x x +-=22a ab b -+=1AB CG ==2BC EC ==13()0a y x c ab b=+≠()20y ax bx c a =++≠1x 2x ()200ax bx c a ++=≠120x x <<,则称这个方程为“友好方程”.如:一元二次方程的两根为,,且,所以一元二次方程为“友好方程”.关于x 的一元二次方程,有下列两个结论:①当时,该方程是“友好方程”;②若该方程是“友好方程”,则有且仅有3个整数p 满足要求,对于这两个结论判断正确的是( )A.①②都正确 B.①②都错误 C.①正确,②错误D.①错误,②正确二、填空题:(本大题8个小题,每小题4分,共32分)请将每小题的答案直接填在答题卡中对应的横线上.11.若,则_______.12.重庆因魔幻建筑被网友称为“8D 魔幻城市”,小成和小都打算2025年元旦分别从洪崖洞、李子坝、磁器口、解放碑四个景点选择一个景点一日游,小成和小都选择了同一个景点的概率为________.13.抛物线的顶点坐标为_______.14.高6m 的旗杆在水平地面上的影长为8m ,如果此时附近的一建筑物在水平地面上的影长为24m ,则该建筑物的高度为________m.15.如图,在中,,,D 为AC 上一点,,,则________.16.如图,在菱形ABCD 中,对角线AC 、BD 交于点O ,以BD 为斜边作,使得,AC 与BP 交于点Q ,连接AP ,若,,,则AC 的长为_________.17.若a 使关于x 的分式方程有整数解,且使关于y 的一元二次方程1213x x ≤≤28150x x ++=15x =-23x =-5133-≤≤-28150x x ++=()210x p x p +--=23p =-95a b =a b b-=()2321y x =--+Rt ABC △90C ∠=︒2sin 5A =45BDC ∠=︒8DC =AB =Rt BPD △90BPD ∠=︒AQ DO =2PAQ PBD ∠=∠4BD =33122ax x x x--=--()21520a y y ---=有实数根,那么满足条件的所有整数a 的和为_________.18.如图,平面直角坐标系中正方形OABC 的顶点A ,C 分别在x 轴,y 轴上,且,的图象与正方形OABC 的两边AB 、BC 分别相交于M 、反比例函数N 两点,且的面积为3.5,若动点P 在x 轴上,则的最小值是__________.三、解答题:(本大题8个小题,第19题8分,其余每题10分,共78分)解答每小题必须给出必要的演算过程或推理步骤,画出必要的图形,请将解答过程书写在答题卡中对应的位置上。
九年级上册数学半期考试试题
…………………密…………封…………线…………内…………不…………能…………答…………题……………………………………绵阳中学育才学校九上半期考试数学试题本试卷分为试题卷和答题卷两部分,其中试题卷由第I 卷(选择题)和第Ⅱ卷组成,共4页;答题卷共4页.满分150分.考试时间90分钟,考试结束后将答题卡和答题卷一并交回.第Ⅰ卷(选择题,共36分)一、精心选一选,相信你一定能选对!(每题3分,共36分)1.下列图形中,是中心对称图形的是A B C D2.点(2,-1)关于原点对称的点的坐标为A .(2,1)B .(-2,1)C .(1,-2)D .(-2,-1)3.如图,⊙O 的半径为5,AB 为弦,半径OC ⊥AB ,垂足为点E ,若OE =3,则AB 的长是 A .4 B .6 C .8 D .10(第3题图) (第5题图) (第7题图) 4. 方程x x22=的解是A. 2=xB. 2=x C. 0x = D. 2=x 或0x =5. 如图,⊙O 的半径OC 垂直于弦AB , D 是优弧AB 上的一点(不与点A 、B 重合),若∠AOC =50°,则∠CDB 等于A .25°B .30°C .40°D .50° 6. 若关于x 的一元二次方程013)1(22=-++-m x x m 有一根为0,则m 的值为A . 1B .-1C .1或-1D .217.如图,⊙O 中,ABDC 是圆内接四边形,∠BOC =110°,则∠BDC 的度数是A.110°B.70°C.55°D.125°8.如图,将边长为3cm 的正方形ABCD 绕点C 逆时针旋转30º后得到正方形A ′B ′C D ′,那么图中阴影部分面积为A.3cm 2B.33cm 2C.92cm 2D.63cm 2 9、式子21+-x x 中x 的取值范围是( ) A 、x≥1 且 X ≠-2 B 、x>1且x≠-2 C 、x≠-2 D 、x≥110、已知0>b , 化简b a 3-的结果是( ) A 、ab a B 、ab a - C 、ab a -- D 、ab a -11、如图,在ABC △中,1086AB AC BC ===,,,经过点C 且与边AB 相切的动圆与CB CA ,分别相交于点E F ,,则线段EF 长度的最小值是( ) A .42B .4.75C .4.8D . 512、已知点A 的坐标为(a ,b ),O 为坐标原点,连接OA ,将线段OA 绕点O 按逆时针方向旋转90°得OA 1,则点A 1的坐标为( )A . (﹣a ,b )B . (a ,﹣b )C . (﹣b ,a )D . (b ,﹣a )二、耐心填一填:(4×6=24分)13、若 5 的整数部分是a ,小数部分是b ,则a -1b= 。
四川省成都市青羊区树德实验学校2023-2024学年九年级上学期半期数学试题 - 副本
2023~2024学年度(上期)半期考试题九年级数学(试卷满分:150分;考试时间:120分钟)A 卷(100分)一、选择题(本大题共8小题,每小题4分,共32分)1.如图是一个空心圆柱体,其主视图是(▲)A .B .C .D .2.下列计算正确的是(▲)A .22()()a b a b a b B .336235a a a C .3222632x y x x y D .236(2)6x x 3.下列各组线段(单位:)cm 中,成比例线段的是(▲)A .2,3,4,5B .1,3,5,7C .2,3,4,6D .3,4,5,64.已知关于x 的方程||(2)340m m x x 是一元二次方程,则(▲)A .2m B .2m C .2m D .2m 5.矩形具有而菱形不一定具有的性质是(▲)A .对角线相等B .对角线互相垂直C .对角线互相平分D .对角线平分一组对角6.对于函数4y x,下列说法错误的是(▲)A .点2(3,6)在这个函数图象上B .这个函数的图象位于第一、三象限C .这个函数的图象既是轴对称轴图形又是中心对称图形D .当0x 时,y 随x 的增大而增大7.某一芯片实现国产化后,经过两次降价,每块芯片单价由188元降为108元.若两次降价的百分率相同,设每次降价的百分率为x ,根据题意列方程得(▲)A .2188(1)108x B .2188(1)108x C .188(12)108x D .2108(1)188x8.如图,在ABC 中,D ,E 分别是AB ,AC 上的点,//DE BC ,BE 与CD 相交于F ,则下列结论一定正确的是(▲)A .AD DEBD BC B .DF EFBF FC C .DF AEFC ECD .AD AEAB AC二、填空题(本大题共5小题,每小题4分,共20分.)9.如果)(043 ab b a ,则a ba▲.10.若a ,b 为两个连续整数,且a b ,则a b▲.11.如图,当太阳光与地面上的树影成45 角时,树影投射在墙上的影高CD 等于2米,若树根到墙的距离BC 等于8米,则树高AB 等于▲米.11题12题13题13.如图,在∆ABC 中,90C ,12AB .按以下步骤作图:①以点A 为圆心,适当长为半径作圆弧,分别交边AB ,AC 于点M ,N ;②分别以点M 和点N 为圆心,大于MN 一半的长为半径作圆弧,在BAC 内,两弧交于点P ;③作射线AP 交边BC 于点D .若DAC ABC ∽,则的BD=.三、解答题(共6小题,满分48分)14.(本大题共2小题,每小题6分,共12分)(1)计算:2020101(1)()(3.14)|3|2;(2)解方程:x x x 2213 )(.15.(8分)已知关于x 的一元二次方程22(21)10x k x k 有两个不相等的实数根1x ,2x .(1)求k的取值范围;(2)若125x x ,求k的值.16.(8分)某市为加快推进生活垃圾分类工作,对分类垃圾桶实行统一的外型、型号、颜色等,其中,可回收物用蓝色收集桶,有害垃圾用红色收集桶,厨余垃圾用绿色收集桶,其他垃圾用灰色收集桶.为了解学生对垃圾分类知识的掌握情况,某校宣传小组就“用过的餐巾纸应投放到哪种颜色的收集桶”在全校随机采访了部分学生,根据调查结果,绘制了如图所示的两幅不完整的统计图,根据图中信息,解答下列问题:(1)此次调查一共随机采访了名学生,在扇形统计图中,“灰”所在扇形的圆心角的度数为度;(2)若该校有5500名学生,估计该校学生将用过的餐巾纸投放到红色收集桶的人数;(3)李老师计划从A,B,C,D四位学生中随机抽取两人参加学校的垃圾分类知识抢答赛,请用树状图法或列表法求出恰好抽中A,B两人的概率.17.(8分)如图,在四边形ABCD中,AB AD,AC与BD交于点E,ADB ACB.(1)求证:AB AC AE AD;(2)若AB AC,:1:2AE EC ,F是BC中点,求证:四边形ABFD是菱形.18.(10分)如图,直线32y x 与双曲线(0)k y k x交于A ,B 两点,点A 的坐标为(,3)m ,点C 是双曲线第一象限分支上的一点,连接BC 并延长交x 轴于点D ,且2BC CD .(1)求k 的值并直接写出点B 的坐标;(2)点G 是y 轴上的动点,连接GB ,GC ,求GB GC 的最小值;(3)点P 是直线AB 上一个动点,是否存在点P ,使得△OBC 与△PBD 相似,若存在,求出此时点P 的坐标;若不存在,请说明理由.B 卷(共50分)一、填空题(本大题共5个小题,每小题4分,共20分)19.如图,点C ,D 为线段AB 的黄金分割点,若AB =6,则CD =▲..20.已知2310x x 的两根分别是1x 和2x ,则21231x x =▲.21.有两把不同的锁和三把钥匙,其中两把钥匙能打开同一把锁,第三把钥匙能打开另一把锁.任意取出一把钥匙去开任意的一把锁,一次能打开锁的概率是▲.22.对于一个数x ,我们用 x 表示小于x 的最大整数,例如: 1.61 , 45 .①填空: 0=▲, 2023 =▲;②若 36x ,则x 的取值范围▲..23.在△ABC ,D 为BC 上一点,E 为AD 上一点,2BED BAC DEC ,若14CD BD ,BE =28,则AE =▲.2 2EA二、解答题(本大题共3个小题,共30分)24.(8分)双十一期间,某网店直接从工厂购进A ,B 两款玩具,进货价和销售价如下表:(注:利润=销售价 进货价)A 款B 款进货价(元/个)2824销售价(元/个)4036(1)若该网店用1320元购进A ,B 两款玩具共50个,求两款玩具分别购进的个数;(2)“双十一”后,该网店打算把A 款玩具降价销售,如果按照原价销售,平均每天可售出8个,每降价1元,平均每天可多售出1个,则将A 款玩具的销售价定为每个多少元时,才能使A 款玩具平均每天的销售利润为96元?25.(10分)如图,已知函数143y x 与x 轴交于点A ,与y 轴交于点B ,点C 与点A 关于y 轴对称.(1)求直线BC 的函数解析式;(2)设点N 是x 轴上的一个动点,过点N 作y 轴的平行线,交直线AB 于点K ,交直线BC 于点Q .①当△KQC 的面积为5时,求点N 的坐标;②连结BN ,如图2,若BNK BAC ,求点K 的坐标.23题图26.如图,在正方形ABCD中,点E在射线BC上(不与点B,C重合),连结AE,将AE绕点A顺时针旋转90°得AF,连结DF,连结EF交AD的延长线于点G,过点A作AH EF,垂足为H,连结BH,AF.(1)求证:AH=HE;(2)HBE=°,并说明理由;(3)若12HGAH,415CE,直接写出DFAD的值.ECBDGHFA。
2023-2024学年重庆市第八中学九年级上学期半期考试物理半期试题
2023-2024学年重庆市第八中学九年级上学期半期考试物理半期试题1.下列说法符合实际的是()A.一节蓄电池的电压为220V B.人体安全电压应不高于36VC.一位中学生人体的电阻约为10ΩD.节能灯正常工作时的电流约为5A 2.下列说法正确的是()A.绝缘体不容易导电的原因是内部没有电荷B.验电器是利用同种电荷相互吸引的原理工作的C.在金属导体中,电流的方向就是自由电子定向移动的方向D.毛皮与橡胶棒摩擦的过程中,橡胶棒带负电,说明橡胶棒得到了电子3.下列说法中正确的是()A.电流是形成电压的原因,有电流一定有电压B.长短相同的两条导线,粗导线的电阻一定较小C.导体的电阻是导体本身的性质,与电压、电流无关D.白炽灯通过不同的电流,测得的电阻不同,因此导体的电阻与电流有关4.下列说法中正确的是()A.使用测电笔时,人体必须要接触笔尾金属体B.家庭电路中用电器一定要用三孔插头接地,保障用电安全C.控制用电器的开关应该和用电器并联,且安装在零线上D.电灯和插座是串联的,电灯的金属螺旋部分接在火线上5.如图所示,八中兴趣小组设计了可测河水流速的电路。
金属杆OM可绕O点转动并与电阻丝ab接触良好,其下端安装有泡沫球,R为保护电阻,当水流速度向左时电表示数增大。
下列电路符合设计要求的是()A.B.C.D.6.重百商场为了统计出入商场的人流量,在大门前安装计数装置,有人经过时计数一次,简化电路图如图甲所示。
其中S为激光源,R1为光敏电阻(有光照射时,阻值较小;无光照射时,阻值较大;有人经过大门时,会挡住照向R1的光线),R0为定值保护电阻,其两端的电压随时间变化的图像如图乙所示。
已知计数器电路的电源电压恒为3V,保护电阻及的阻值为20Ω。
则()A.在0〜3秒内,光敏电阻R1先变小再变大B.电压表示数为2V时,计数器会计数一次C.有人通过商场大门时,光敏电阻R1的阻值为40ΩD.有人通过商场大门和没有人通过商场大门电路的电流之比为2∶17.如图所示,电源电压保持不变。
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2013年秋九年级英语第一学段测试题一、单项选择(共10小题,每小题1分,满分10分)( ) 1---I often go to school early.--- .A. So I goB. So do IC. I do soD. Neither do I( ) 2.Mary thinks grammar is a great way a language.A. to study;to 1earnB. studying;1earningC. studying;to 1earnD. to study;1earning( ) 3.You won’t succeed you work harder than before.A. ifB. unlessC. whetherD. why( ) 4. ---You used to be short, ?--- Yes, I did.A. did youB. used youC. didn’t youD. used not you( ) 5. Sixteen-years-olds shouldn’t ______ to go to an Internet bar.A. be allowedB. be allowC. allowD. are allowed( ) 6. ---_______ there is no water left on the earth?---All the living things will die.A. What ifB. HowC. WhyD. What about( ) 7. What _______ you do if you _______ a millionaire?A. will;wereB. would;areC. would;wereD. do;are( ) 8. The young man is very lazy. He would rather _____ cards every day than _____ outside.A. to play; to workB. playing; workingC. play; workD. playing; to work( ) 9. The sick woman is ______ weak ______ look after herself.A. very; toB. so; thatC. too; toD. so; to( ) 10. ---- Look at the boy running on the ground. Is it Davis?--- It_____ be him. I saw him go to the teacher’s office just now.A. mustB. can’tC. couldD. might二、完形填空(共15小题,每小题1分,满分15分)Joe wanted a computer. He asked his 11 for the money and they said he must get it himself. But how did he get it? He 12 about this when he walked home. Not many people wanted to ask children to work for them. Maybe he could take away snow for the neighbors. But this was not 13 . He had to wait a long time for that. He couldn’t cut grass for their gardens 14 he had no tools (工具) to do the work with.Then he saw one of his classmates, Dick, delivering (送) 15 . I could do that, he thought. Maybe I could even get the computer 16 once. I could pay 17 it a little each week. He ran to 18 up with Dick. Joe asked him a lot of questions. He learned that it was 19 to get twenty-five dollars each week. He learned that the job took 20 three hours each night. Dick 21 him the phone number of the newspaper manager (经理).Joe almost flew home. After he had told his mother 22 he thought, she 23 . “I think it is a 24 idea,” she said, “I’ll call the newspaper….”“Wait, Mum,” Joe said, “I’ll call. After that, I’m going to be a businessman now.”Joe’s mother smiled 25 .( ) 11. A. teachers B. parents C. classmates D. friends( ) 12. A. said B. told C. thought D. spoke( ) 13. A. spring B. summer C. autumn D. winter( ) 14. A. because B. when C. while D. after( ) 15. A. newspaper B. bikes C. computers D. tools( ) 16. A. now B. right C. at D. for( ) 17. A. on B. to C. of D. for( ) 18. A. take B. catch C. carry D. get( ) 19. A. friendly B. kind C. possible D. wrong( ) 20. A. at B. about C. before D. after( ) 21. A. taught B. gave C. made D. asked( ) 22. A. that B. when C. what D. where( ) 23. A. smiled B. shouted C. cried D. worried( ) 24. A. big B. large C. great D. bad( ) 25. A. sadly B. happily C. politely D. angrily三、阅读理解.(每小题2分,计40分)AThere are 45 students in our class. I have made a survey, 36 students say they like to exercise. Most boys play basketball together twice a week. But girls think basketball is difficult for them, they’d like to play volleyball togethe r twice a week. My friend, Tony, is good at running. He runs fastest (最快)in our class. He runs for 30 minutes on the playground every evening before he goes to bed. Is it interesting? Gray is good at swimming. He goes to the swimming club three times a month in winter, and three times a week in summer. So he is pretty healthy. Some of my classmates have good eating habits. They eat both meat and vegetables. 70% of them drink milk every day. 15 students say they drink milk three or four times a week. But some students like to eat junk food, especially Sally. What’s worse(更糟糕的) is that she doesn’t like to exercise, so she is very fat. She always says “ I’m going to lose weight(减肥) tomorrow.”( ) 26. How often do most boys play basketball?A. Every dayB. Twice a dayC. Twice a week.D. Twice a month.( ) 27. Why do the girls dislike to play basketball?A. Because they have no time.B. Because they think it is not easy.C. Because they don’t like to play with the boys.D. Because they don’t like to exercise.( ) 28. When does Tony often run for 30 minutes?A. Every morning.B. Every afternoonC. Every evening before he goes to bed.D. Every evening before supper( ) 29. How often does Gray swim in winter?A. Three times a month.B. Three times a week.C. It isn’t mentioned in the passageD. Hardly ever.( ) 30. Why is Sally so fat?A. Because she doesn’t like to exercise.B. Because she likes to eat junk food very much.C. Because s he eats too much meat, but doesn’t exercise.D. Because she doesn’t like to exercise, and she likes to eat junk food .BDreams may be more important than sleep. Some people don’t need much sleep. But we all need to dream, scientists say. Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams are like short films. They are usually in color. Some dreams are like old films. They come to us over and over again. That may be because the dreamer is worrying about something. Dreaming may be a way of trying to find an answer.Some people get new ideas about their work from dreams. They could have been thinking about their work all day. These thoughts can carry over into dreams. Sometimes we wake up with a good feeling from a dream. But often we can’t remember the dream. Dreams can disappear(消失) quickly from memory(记忆). Too much dreaming can be harmful(伤害). The more we sleep, the longer we dream. The mind is hard at working when we dream. That is why we may have a long sleep and still wake up tired.( ) 31.It may be less important to sleep than to .A. thinkB. dreamC. workD. study( ) 32. Dreams and films are usually .A. very longB. in colorC. about workD. very sad( ) 33. The people often dream about their work because .A. they are tired in the daytimeB. they are not interested in their workC. they may be thinking about their work all dayD. they have too much work to do( ) 34. The main idea of the story is that .A. people need to dreamB. people like to sleepC. dreams are like filmsD. we always remember dreams( ) 35. The title for the story could be .A. Terrible dreamsB. The longest sleepC. MemoryD. DreamsCGoing to a frie nd’s house is very exciting .You may spend time with a friend and get to see where he lives. So remember to be polite.When to arrive The first thing to remember is that when a friend invites you over, you need arrive on time. If your friend tells you to come “around 3 :00 ” , that means you can turn up a little bit after 3 :00 . But usually it is a good idea to arrive at the right time.What to bring Often it is also nice to bring something to your friend’s house. This could be a box of chocolates for you two to share. Or maybe a movie that you can watch together. You can also bring some flowers. A little gift is a nice way to show your friend that you are excited to be at his house.How to greet(招呼)When you visit your friend’s house, you may also meet his parents. You should tell them who you are and they may tell you their names. As a child, I went to visit my friend Paul .I called his parents by their first names John and Mary. But now I know it is more polite to call them Mr. and Mrs. Smith. This will show them more respect(尊重) and then they may tell you to call them by their first names .Another way to show respect is to call them madam or sir.It is a cool thing to visit a friend’s house.Be polite to your friend and your friend’s parents, and you will be invited again.( ) 36. If you are told to get to your friend’s house around 5:00 pm, it is polite to arrive atpm.A. 5:02B. 4:50C. 4:30D. 5:30( ) 37. Wh en the writer was a child, he called his friend’s father.A SmithB JohnC MaryD Paul( ) 38. The passage mainly (主要) tells us .A. when to arr ive at your friend’s houseB. how to greet peopleC. What to bring to your friendD. how to be a god visitor( ) 39. The passage may be from .A. a notice on the wallB. a letter to a friendC. an article in a magazineD. a news story in a paper( ) 40. 下列叙述不正确的是.A. When a friend invites you over, you need to arrive on time.B. A little gift is a nice way to show your friend that you are excited to be at his house.C. Another way to show respect is to call them madam or sir.D. You need to be polite to your friend but don’t need to be polite to your friend’s parents.DYoung people can have problems with their minds. Some students become worried because they have to study very hard. Others have trouble getting on well with people like their parents and classmates.Liu Wei, a Junior 2 student from Hefei, could not understand his teacher and was doing badly in his lessons. He became so worried about it that he started to cut his finger with a knife.Another student, 14-year-old Yan Fang from Guangzhou, was afraid of exams. She got very worried in one, and when she looked at the exam paper. She couldn’t think of anything to write.A recent report from Jiefang Daily says about 18% of Shanghai teenagers have mental (心理的,精神的)problems. Their troubles include(包括)being worried and very unhappy. And having problems in learning and getting on with people. Many students who have problems won’t go for advice (劝告)or help. Some think they will look stupid(愚蠢)if they go to see a doctor. Others don’t want to talk about their secret.Liang Yuezhu, an expert(专家) on teenagers from Beijing Anding Hospital has the following advice for teenagers:*Talk to your parents or teachers often*Take part in group activities and play sports*Go to see a doctor if you feel unhappy or unwell( ) 41. The students who often become worried or have trouble getting on with others may have .A. mental problemsB. a headacheC. knives with themD. no parents( ) 42. Liu Wei cut his finger with a knife because .A. he was afraid of his teacherB. he wanted to frighten his parentsC. he was so worried about his studiesD. his finger was badly hurt( ) 43. Yan Fang’s problems happened whenever.A. she studied very hardB. she had examsC. she talked with her parentsD. she thought of something( ) 44. Students who have problems won’t ask others for help because .A. they won’t let others th ink they are stupidB. they don’t think doctors can help themC. they don’t want to tell their secret to othersD. both A and C( ) 45. Liang Yuezhu’s advice tells us that .A. it’s better for the students who have mental problems to join othersB. i t’s unnecessary for them to be with othersC. only group activities and sports can help themD. teachers and parents can’t do anything about mental problems四、根据首字母提示补全对话,并把单词完整的填到题后的空格里。