甘肃省兰州市届九年级数学下学期模拟试题(一)(完整版)资料.doc

甘肃省兰州市届九年级数学下学期模拟试题(一)（完整版）资料(可以直接使用，可编辑 优秀版资料，欢迎下载）甘肃省兰州市2021届九年级数学下学期模拟试题（一）温馨提示：1. 本试卷分试题卷和答题卷两部分。满分150分, 考试时间120分钟.2答题时, 应该在答题卷密封区内写明班级和姓名。3考试时不能使用计算器，所有答案都必须做在答题卷标定的位置上，请务必注意试题序号和答题序号相对应.一、选择题：（本大题共15小题，每题4分，共60分. 在每题所给出的四个选项中，只有一项是符合题意的.把所选项前的字母代号填在答题卡上. ）1、在中，若，则的长是 A、6 B、 C、D、2、由五个同样大小的立方体组成如图的几何体，则关于此几何体三种视图叙述正确的是A左视图与俯视图相同B左视图与主视图相同C主视图与俯视图相同D三种视图都相同3、如图，在半径为5cm的O中，圆心O到弦AB的距离为3cm，则弦AB的长是A、4cm B、6cm C、8cm D、10cm4、如图，一根电线杆的接线柱部分AB在阳光下的投影CD的长为1米，太阳光线与地面的夹角，则AB的长为A、米B、米C、米D、米5、如图，是O直径，则A、65° B、25° C、15° D、35°6、如图，是一水库大坝横断面的一部分，坝高h=6m，迎水斜坡AB=10m，斜坡的坡角为，则 的值为 A、 B、 C、 D、7、RtABC中,C=90°,已知cosA=,那么tanA等于A、 B、 C、 D、8、如图，线段CD两个端点的坐标分别为C（1，2）、D（2，0），以原点为位似中心，将线段CD放大得到线段AB，若点B的坐标为（5，0），则点A的坐标为A（2，5）B（2.5，5）C（3，5）D（3，6）9、下列函数中，其图象与x轴有两个交点的是 A、 B、（第10题图）C、 D、10、如图，是O的直径，弦，则，两点到直线距离的和等于、 、 、11、某校初三参加体育测试，一组10人的引体向上成绩如下表： 完成引体向上的个数78910 人 数1135这组同学引体向上个数的众数与中位数依次是A、95和10 B、9和10 C、10和95 D、10和912、若抛物线与轴的交点坐标为，则下列说法不正确的是 A、抛物线的开口向上 B、抛物线的对称轴是直线 C、当时的最大值为 D、抛物线与轴的交点坐标为、13、反比例函数的图象如左图所示，那么二次函数的图象大致为OOD、OC、OB、OA、 y y y y x x x x 14、如图所示，圆O的直径为10，弦AB的长为6，M是弦AB上的一动点，则线段的OM的长的取值范围是（ ）A、 3OM5B、 4OM5 C、3OM5D、 4OM515、从右图所示的二次函数的图象中,观察得出了下面五条信息: c0; 0 0 0 0.你认为其中正确的信息个数有（ ） A、2个 B、 3个 C、 4个 D、5个二、填空题：（本题有5个小题, 每小题4分, 共20分，把正确答案写在答题卡上) 16、方程的根是17、将的图象向左平移1个单位，向上平移1个单位后的解析式为_.yxOABPQMN第19题图18、如果 ，且，那么k = 19、如图，点P、Q是反比例函数图象上的两点，PAy轴于点A，QNx轴于点N，作PMx轴于点M，QBy轴于点B，连接PB、QM，ABP的面积记为S1，QMN的面积记为S2，则S1 S2（填“>”或“<”或“=”）20、已知m，n是关于x的方程x 22axa60的两实根，则(m1)2(n1)2的最小值为_三、解答题：（本题7题，共70分.解答时写出必要的文字说明、证明过程或演算步骤）21、 （1）（本小题满分5分） 计算：（2）（本小题满分5分）解方程： 22、（本小题满分6分 ）某商店设置了如下促销活动：如果购买该店的商品100元以上，就有一次摸奖机会，摸奖箱里有三个标号分别为A、B、C的质地、大小都相同的小球，任意摸出一个小球，记下小球的标号后，放回箱里并摇匀，再摸出一个小球，又记下小球的标号商店规定：若两次摸出的小球的标号都是B则为一等奖，而两次摸出的小球的标号只要不相同就为二等奖请你用画树形图或列表的方法，分别求出摸一次奖获一、二等奖的概率23、（本小题满分10分）如图，从热气球上测得两建筑物、底部的俯角分别ABCDEFEE为30°和如果这时气球的高度为90米且点、在同一直线上，求建筑物、间的距离24、（本小题满分10分）已知：抛物线 （1）当对称轴为时，求此抛物线的解析式和顶点坐标； （2）若代数式的值为正整数，求x的值25、（本小题满分10分）如图所示，圆O的直径AB和弦CD交于E，已知AE=6cm，EB=2cm，CEA=30°，求CD。 PyABxCDO第26题图26、（本小题满分12分 ）如图，A，B，是一次函数与反比例函数图象的两个交点，AC x轴于点C，BD y轴于点D （1）根据图象直接回答：在第二象限内，当x取何值时，?（2）求一次函数解析式及m的值；（3）P是线段AB上一点，连接PC，PD，若PCA和PDB面积相等，求点P的坐标27、（本小题满分12分 ）已知二次函数y = ax2的图象经过点（2，1）（1）求二次函数y = ax2的解析式；（2）一次函数y = mx+4的图象与二次函数y = ax2的图象交于A（x1、y1）、B（x2、y2）两点当时（图），求证：AOB为直角三角形；试判断当时（图），AOB的形状，并证明；（3）根据第（2）问，说出一条你能得到的结论（不要求证明）AxyBO第27题图xyOAB图图兰州十四中2021-2021学年第二学期初三第一次月考试卷 数学答题卡一、 选择题：（本大题共15小题，每题4分，共60分）1、【A】 【B】 【C】 【D】 6、【A】 【B】 【C】 【D】 11、【A】 【B】 【C】 【D】2、【A】 【B】 【C】 【D】 7、【A】 【B】 【C】 【D】 12、【A】 【B】 【C】 【D】3、【A】 【B】 【C】 【D】 8、【A】 【B】 【C】 【D】 13、【A】 【B】 【C】 【D】4、【A】 【B】 【C】 【D】 9、【A】 【B】 【C】 【D】 14、【A】 【B】 【C】 【D】5、【A】 【B】 【C】 【D】 10、【A】 【B】 【C】 【D】 15、【A】 【B】 【C】 【D】二、 填空题：（本题有5个小题, 每小题4分, 共20分）16、_；17、_；18、_；19、_；20、_。三、 解答题：（本题共70分）21、（1）解：（2）解：22、解：23、解ABCDEFEE24、解：25、解：26、解PyABxCDO第26题图AxyBO第27题图xyOAB图图27、解：七年级20212021学年下学期数学竞赛试题及答案A 1?B，则?A= ,?B= . 13.在?ABC中，若?A=?C=七年级20212021学年下学期数学竞赛试题 3B C D 一、选择题:(每小题3分，8小题，共24分) 14.如图，在?ABC中，AD是中线，则?ABD A B 1(下列说法中正确的是( ) 的面积 ?ACD的面积(填“,”“,”“,”). 15.如图，AB?CD，那么?BAE+?AEC+?ECD = . 332E ,r A.不是整式 B.是单项式 C.2，a是单项式 D.是多项式 aa 44mnm+nD 2.设m，n都是自然数，多项式x,y+3的次数是( ) 16.有一个英文单词的字母顺序对应如图中的有序数对分别为 C A.2m+2n B.m或n C.m+n D.m、n中较大的一个数 (5,2),(2,2),(7,2),(5,1),请你把这个英文单词写出来或者翻译成 4VXWYZ3ORSPTUQ3.所有内角都相等的十八边形，它的每个内角、外角的度数是( ) 中文为 . KMN2HIJL A. 120?, 60? B. 140?, 40? C. 160?, 20? D. 100?,80? 三(解答题 ( 共7题，共72分 ) ACEGDF1B4(如果?1+?2=90?，又?3+?1=90?，则?2与?3的关系是( ) 17.计算题(每小题6分,共12分) 2567134A、互余 B、互补 C、相等 D、不能确定 12133(1).()(2)(+)(2) ，,5.若点A(m,n)在第二象限,那么点B(-m,?n?)在( ) 232A.第一象限 B.第二象限 C.第三象限 D.第四象限 6.下列命题中正确的个数为( ) (1)过两点有且只有一条直线;(2)经过直线外一点有且只有一条直线与已知直线垂 直;(3)两直线平行，同旁内角相等;(4)三角形的中线、角平分线都是线段; 14(2)2()bababb，,(2).先化简，然后代一个你喜欢的数求值. A 7 A. 1 B. 2 C. 3 D. 4 27.三角形的一个外角小于与它相邻的内角,则这个三角( ) A.锐角三角形 B.钝角三角形 C.直角三角形 D.无法确定 D 8.如图，在锐角?ABC中，CD、BE分别是AB、AC边上的高， E P 且相交于一点P，若?A=50?,则?BPC的度数是( ) A(150? B(130? C(120? D(100? 18.(本题6分) B C 如图，(1)过点A画高AD; 二、填空题:(每小题3分，,小题，共24分) (2)过点B画中线BE; 9.把命题“两直线平行,同旁内角互补”改写成“如果那么”的形式 (3)过点C画?ACB的平分线CF( . 310.过n边形的一个顶点有6条对角线,m边形没有对角线,则(m-n) = . 11.如图3，要得到a?b，则需要条件 ,理由 . 12.若等腰三角形的两边长分别为3cm和8cm，则它的周长是 . 第1页 第2页 19.(本题10分) 22.(本题12分) 2有一些相同的房间需要粉刷墙面. 一天3名一级技工去粉刷8个房间, 结果其中有50m如图，在?ABC中，已知?ABC=66?，?ACB=54?，BE是AC上的高，CF是 墙面未来得及刷;同样的时间内5名二级技工粉刷了10个房间之外,还多刷了另外的AB上的高，H是BE和CF的交点，求?ABE、?ACF和?BHC的度数. 2240m的墙面. 每名一级技工比二级技工一天多粉刷10m墙面, 求每个房间需要粉刷的墙面面积 ? 20.(本题10分) 如图，?AOB中，A、B两点的坐标分别为(2，5)，(6，2)，把?AOB向下平移3个单23.(本题12分) 如图，已知，AC?DE，DC?FE，CD平分，求证:EF平分. 位，在向左平移2个单位，得到?AOB . ，BED，ACB(1)写出A 、O 、B三点的坐标，并在图中画出?AOB . (2)求出?AOB的面积 Ayy B Ox 21.(本题10分) 北如图2，A点在B处北偏东40?方向，A点在C处的北偏西45?方向，求?BAC的度 北数, EDAC(一)教学重点B20题图2第3页 密封线内请勿答题 tanA是一个完整的符号，它表示A的正切，记号里习惯省去角的符号“”；13 (2)化简得:10b 17、(1), 1218、略 (1)相交: 直线与圆有两个公共点时,叫做直线和圆相交,这时直线叫做圆的割线.麒麟区第二中学七年级下学期数学竞赛 4.坡度：如图2，坡面与水平面的夹角叫做坡角坡角的正切称为坡度 (或坡比)。用字母i表示，即19、设每个房间需要粉刷的墙面面积为X cm 9.直角三角形变焦关系：一、 选择题 8x,5010x，40据题意得 - 解得 x=52 ,10351、B 2、C 3、C 4、C 5、A 6、C 7、B tanA没有单位，它表示一个比值，即直角三角形中A的对边与邻边的比；20、(1)坐标A(0,2) ,O(-2，-3) ,B(4，-1)图略;8、B (2)S?AOB=13 二、填空题 21、?BAC=85? 9、如果两直线平行，那么同旁内角互补。 22、?ABE=30? ,?ACF=30? ,?BHC=120? 10、-216 d>r <=> 直线L和O相离.23、略 当a0时，抛物线开口向上，并且向上方无限伸展。当a0时，抛物线开口向下，并且向下方无限伸展。11、?3=?4或?1+?2=180?，理由:“内错角相等， >0 <=> 抛物线与x轴有2个交点；两直线平行”或“同旁内角互补，两直线平行” 12、19cm 第4页 13、108? 14、= 11.弧长及扇形的面积15、360? 16、LINE 三、解答题 浙江省杭州市2021届高三下学期二模教学质量检测英语试题第卷第一部分：听力（共两节，满分30分）第一节(共5小题；每小题1.5分，满分7.5分） 1. How does the man get exercise?A. He dances.B. He goes running.C. He plays basketball.2. What is Paul mainly going to do in the USA?A. Travel around.B. Study at a school.C. Visit old friends. 3. What does the man mean?A. He intends to buy another ticket for the movie. B. He himself is not going to finish watching the movie.C. He asks the woman to stay before the movie ends.4. Where does the conversation probably take place?A. In a store.B. In a bank.C. In a telephone booth.5. When will the flight arrive?A. At 4 pm.B. At 4: 30 pm.C. At 6 pm.第二节（共15小题；每小题1.5分，满分22.5分）每段对话或独白读两遍。听第6段材料，回答第6、7题。6. How often does the man have a Chinese lesson now?A. Every two weeks. B. Every week. C. Every day7. In which way does the man want to practice Chinese most?A. Speaking to Chinese people. B. Going to a Chinese Corner. C. Visiting Chinese language websites.听第7段材料，回答第8至10题。8. When is the man going to leave the hotel?A. Today.B. Tomorrow.C. The day after tomorrow.9. Why cant the man stay in the same room?A. It has been booked.B. It is being painted.C. It will be sold.10. Which room will the man move in?A. Room 607.B. Room 102.C. Room 314.听第8段材料，回答第11至13题。11. What are the speakers talking about?”A. A trip.B. A hobby.C. A stamp.12. What does the woman think of collecting stamps?A. Cheap.B. Rewarding.C. Difficult.13. What is the woman going to do?A. To share a story with her friends. B. To buy a new set of stamps. C. To see some stamp collectors.听第9段材料，回答第14至16题。l4. What is the woman doing?A. Shes making a workout plan. B. Shes buying exercise equipment. C. Shes consulting about a fitness service.15. Who will give a new customer a fitness assessmentA. A personal trainer. B. A qualified doctor. C. A regular customer.16. How much will the woman pay?A. $ 500. B. $ 2, 500.C. $ 4,500.听第10段材料，回答第17至20题。17. What is the woman?A. A bus driver.B. A tourist guide.C. A salesperson.18. Where should the listeners go if they get lost?A. To the ticket office.B. To the tourist bus.C. To the main gate.19. What may surprise the listeners?A. The palace has become a museum. B. There are people living in the palace.C. Kings and queens often come to the palace.20. What should the listeners do before they have their photos taken with the local people?A. Put on traditional clothes. B Ask for their permission.C. Talk with their families.第二部分 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） AIt is halfway through October. The sun arrives early and I stare out my window, feeling shame for invading（侵犯）the privacy of the homeless woman who has settled across the street. I am not sure when she first appeared, maybe a month ago. Each morning I watch as she gets out from the narrow space between the two large buildings across from mine.She wears the same dirty, badly torn dress every day. I can see she fights to pull herself up into a standing position. She fails on the first two or three tries, but determination always wins out. She remains leaning against the wall for several long minutes, appearing to gather the necessary strength needed to pick up her possessions all packed into five plastic bags. With tears in my eyes, I watch as she places her feet pointing outward to avoid falling. Her steps are measured and cautious as she slowly makes her way to the corner and disappears.When I first noticed this woman, I went across the street and offered her 20 dollars, but she turned her back to me and pretended not to see me. The expression on her face was one of shame, causing me to feel guilt for invading her privacy. The next night I bought a hotdog and a Coke, and left them in the spot when she was not there. Feeling like a spy, I watched as she ate the hotdog like a starving car that had not eaten for days.I too often find myself complaining about life, but when I look out my window and see the old woman, I feel the need to apologize for my foolish pride in not realizing how fortunate I really am.There are many poor people in my town. I have become familiar with many of their faces, and then suddenly they disappear. I know that one day the old woman will be gone and I will have no idea where she is. I fear that day.21 .What is the main idea of paragraph 2?A. Life is tough for the homeless woman. B. Poverty causes the womans poor health.C. The woman doesnt care about her appearance. D. Possessions mean much to the woman.22. Why did the woman refuse the authors 20 dollars?A. The money didnt help much. B. She didnt like the author.C. Accepting money was guilty.D. She felt her dignity was hurt.23. What lesson does the author learn from the homeless woman?A. Complaints can sometimes make life worse. B. He should appreciate his present life more.C. More is to be done to make life meaningful. D. We should all apologize for ignoring the poor.24. Which of the following words best describes the author of the text?A. Optimistic.B. Sympathetic.C. Determined.D. Easy一going.BA laptop, a hair straightener, Christmas lights, an e一reader, a kettle, two bags, a pair of jeans, a remote一control helicopter, a spoon, and a dining一room chair. All broken.It sounds like a pile of things that youd stick in boxes and take to the dustbins. In fact .its a list of things mended in a single afternoon by British volunteers determined to get people to stop throwing things away. This is the Reading Repair Cafe, part of an international network aimed at dealing with a world of rubbish.The helicopter belongs to William who cheerfully describes himself as “mechanically incompetent”. He has owned it for 8 years, but 3 years ago it stopped working and it has been sitting unused in his cupboard ever since.He sits down at the table of Colin Haycock, an IT professional who volunteers at the repair cafe, which has been running for about four years and is a place where people can bring all manner of household items to be fixed for free. In less than five minutes, Haycock has fixed the helicopter and it works well.William looks ashamed; Haycock looks pleased. “I wish they were all that simple,” he says.Today, the repairers will stop 24kg of waste from going to landfill(垃圾填埋场) and save 284kg of CO2. Some items cant be fixed on the spot but very little needs to be thrown away.Gabrille Stanley, who used to run a clothing business, says she was drawn to volunteering at the repair cafe to fight the “throwaway culture” she sees. About 300, 000 tons of clothing was sent to landfill in the UK in 2021 and a report from WRAP puts the average lifespan(寿命) for a piece of clothing in the UK at 3. 3 years.25. What is the authors purpose in writing paragraph 1?A. To present the main idea. B. To support the authors opinion.C. To raise readers interest. D. To establish an argument. 26. Why doesnt William repair the helicopter himself?A. He is both lazy and busy. B. He is ashamed of repair work.C. He doesnt treasure the helicopter. D. He lacks the necessary skills.27. Which of the following argument will Gabrille Stanley probably agree with?A. People should send old clothing to landfill. B. People should hold on to their clothes longer.C. Clothing factories are to blame for the waste. D. Running a clothing business is no easy task.C The descriptions are scary. Some people felt fine in the morning and then were dead by night. Patients coughed up blood. Their faces turned blue. That was what happened in 1918. A deadly flu killed tens of millions of people around the world. It is 100 years later. Scientists are thinking about how to keep us safe from another super一flu. Dr. Anthony Fauci says we need one vaccine(疫苗) that can protect against most or all types of the flu. Scientists want a shot t