2011-2012学年度莒南第一学期九年级期末考试

第一学期九年级期末考试 数学试题

一、选择题：（每小题3分，共30分）将唯一正确答案的代号字母填在下面的方格内． 1．下列各等式成立的是

A ．4)4(

2

-=-

B ．

3)3(2=- C ．x x =2

D ．

24±=

2．方程（x 一1）（x 一2）=1的根是

A ．2,121

==x x B ．2,121-=-=x x C ．3,021==x x

D ．以上不对

3．已知矩形ABCD 的对称中心恰为原点O ，且点A 的坐标为（2，一3），则C 点的坐标为 A ．（一2，3）

B ．（一2，一3）

C ．（2，3）

D ．（一3，2）

4．下列判断错误的是

A ．相等的圆周角所对的弧相等

B ．相等的弦所对的圆周角相等

C ．长度相等的两条弧是等弧

D ．经过圆心的弦也是圆的直径

5．已知一个圆锥的侧面展开图是一个半径为9，圆心角为120°的扇形，则该圆锥底面圆的半径等于

A ．3

B ．9

C ．10

D ．27

6．已知圆锥的底面半径为1cm ，母线长为3cm ，则其全面积为 A ．2

cm π

B ．2

3cm π

C ．2

4cm π

D ．2

7cm π

7．随机掷一枚均匀的硬币两次，落地后至少有一次正面朝上的概率是 A ．

2

1

B ．

4

1 C ．

3

2 D ．

4

3

8．已知二次函数的图象如图所示，下列结论正确的是

A ．b>0，c>0

B ．b>0，c<0

C ．b<0，c>0

D ．b<0，c<0 9．二次函数y=2x 2-mx+5，当x<一2时，y 随x 的增大而减小；当x>一2时，y 随x 的增大而增大，则m 的值为 A ．一4

B ．一8

C ．8

D ．无法计算

10．如图，已知DE//BC ，CD 和BE 相交于点O ，

S △DOE ：S △COB =4：9,则AE ：EC 为 A ．2：3 B ．2：1 C ．4：9

D ．5：4

二、填空题：（每小题3分，共30分）将正确答案直接填在题中横

线上。

11．两个最简二次根式a

a 与

d

c 相加得6

5

，则

a+b+c=________．

12．已知关于x 的一元二次方程（a 一2）x 2+3x+a 2-3a+2=0有一个根为0，则a 的值为______ 13．如图，AB 是半圆O 的直径，D 是弧AC 的中点，∠B=50°。则∠A 等于_______度．

14．已知圆锥的底面周长为4πcm ，母线长为3cm ．则它的侧面展开图的圆心角为______度．

15．某同学的文具盒中有两支蜡笔，一支红色的，另一支绿色的，还有三支水彩笔，颜色分别是黄色、黑色、红色．从中任意拿出一支蜡笔和一支水彩笔，这两支笔正好都是红色的概率为____________．

16．已知抛物线y=x 2+bx+2的顶点在x 轴上，则b 的值为__________． 17．用一根长为8cm 的细铁丝围成一个矩形，则矩形的最大面积是_________．

18．一根2米长的标杆直立在水平地面上，它在阳光下的影子长为1．5米，有一根垂直于地面的旗杆，此时测得其影长为3米，那么这根旗杆的高度为________米．

19．如图，已知△ABC 与DEF 是位似图形，它们的位似中心恰好为原点。已知A 点坐标为（2，0），D 点坐标为（5，0），若BC=1．6，则EF=________．

20．已知抛物线y=ax 2+bx+c （a<0）过A （一2，0）、O （0，0）、B （-3，y 1）、C （3，y 2）四点，则y l 与y 2的大小关系是_____________．

第一学期九年级期末测试 数学试卷 姓名 分数

一选择：

二填空：

11 12 13 14 15 16 17 18 19 20

三、计算题：（共22分）

21．已知三角形的三边长分别是2cm ，5cm ，acm ．且a 是一元二次方程x 2—9x+18=0的一个根，求此三角形的周长．（6分）

22．如图，PA 、PB 切OO 于A 、B 两点，∠APB=60°⊙O 的半径为3cm ，求阴影部分的面积．（7分）

23．已知二次函数y=x 2—8x+15的图象与x 轴交于A 、B 两点，点C 在该抛物线上移动，若△ABC 的面积为1，求此时点C 的坐标．（9分）

四、证明题：（共14分）

24．如图，已知AB 是⊙O 的直径。弦AC//OD ，求证：弧BD=弧CD ．（6分）

25．如图，在口ABCD 中，E 是BC 边上的一点，连结DE ，F 是DE 上的一点，连结AF 且∠AFE=∠B ．又知AB=2，BC=3，AF=1．5．

（1）求证：△AD

F

∽△

DEC

；（2）求DE 的长．（8分）

五、应用题：共l9分）

26．如图，路灯S 距地面4米，身高1．6米的小明从距离路灯的底部（点O ）6米的点A 处，沿DA 所在的直线行走6米到达点B 时，人影的长度增加了几米?（9分）

27．某公司经销一种产品，每千克的成本价为50元．通过市场调查发现，每天的销售量W （千克）随销售单价x （元/千克）的变化而变化，具体关系式为2002+-=x ω，设销售利润为y （元）．解

答下列问题：

（1）求y 与x 的关系式；

（2）当x 取何值时，y 的值最大?最大利润是多少?

（3）物价部门规定销售单价每千克不得高于75元，公司要想每天获得1200元的利润，销售单价应定为多少元?（每千克利润=每千克销售单价一每千克成本价）（10分）

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（）11. A. front B. back C. end （）12. A. friend B. teacher C. classmate （）13. A. watch B. remember C. understand （）14. A. make B. play C. learn （）15. A. some B. little C. most 第二部分笔试部分 二、单项填空（本题有15小题，每小题1分，共15分) 16．--- How do you study a test --- I study working a group. A. for, in, with B. for, by, at C. for, by, with D. of, in, by 17. --- Hey! Don’t you remember me --- Wow! Paula You used to ________ curly hair. A. be B. are C. have D. has 18. Sixteen-years-olds shouldn’t ______ to go to an Internet bar. A. be allowed B. be allow C. allow D. are allowed 19. -– Do you feel tired --- No, I don’t. If I were tired, I ______a rest. A had B would have C will have D have 20. --- Tom, where is your father？ --- I’m not sure. He_______ in his office. A. is B. may be C. maybe D. may 21. I don’t like p eople ______ talk much but do little. A. who B. that C. which D. whose 22. ---Where would you like to go ---I’d like to go ________. A. warm somewhere B. place warm C. somewhere warm D. warm place 23. ---You look so , don't you

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A A few years ago, I worked at a church(教堂) and since my son was home schooling, he went with me to the church every day. Most mornings, we’d stop at a local convenience store, getting a chocolate drink for him and a cup of coffee for me. The clerk at the store we chose to visit refreshed our lives each day, and so we returned again and again. She had found her own way of enjoying life and her job. I’m not even sure that she was realizing that her energy put a smile on the face of each customer. When a customer brought cookies to the counter, any other clerk could have asked: “Would you like some milk with those cookies? ”Instead, she inquired,“Would you like a lottery ticket(彩票) with those cookies?” She might have asked me if I wanted a donut with my coffee. But instead, she asked: “Would you like some batteries(电池) with that coffee?” Yes, life is what you make of it. This clerk’s method of dealing with what some think is a boring job, and with the customers she met daily, made the hours in her day more enjoyable. In doing that, she also refreshed the lives of others and made them laugh. Sometimes, if my day at the church had been particularly tiring, we’d stop at that store before heading home. We’d giggle (咯咯笑) as we left the store, the clerk’s words echoing (回响) behind us. “Would you like some shampoo with that soda?” 16. What did the writer do a few years ago? A. She was a teacher in a school. B. She was an office worker. C. She was a doctor in a hospital. D. She was a worker at a church. 17. When did the writer and her son usually stop at the local store? A. In the morning B. At noon C. In the afternoon D. In the evening. 18. Why did the writer and her son usually stop at the local store? A. Because the drinks were delicious there. B. Because the food was cheap there C. Because they felt happy there D. Because there was only store 19.what was the clerk like? A. She was serious.

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及格率和均分。基础性的题目较多，预设难度为0.60-0.65。中档题的难度以中等生的难度为参照，中等生可较好发挥，但难题的高度较高，要考高分有一定的困难，满分较难。 三、班级基本情况 本班54人参加考试，优分12人，及格24人，低分21人，均分60，成绩一般。 四、得失分析 1. 学生答题情况分析:主要得失分分布情况 (1)得分情况:总体看来，学生答题比较好的主要集中在能够直接应用课本的基础知识的题目，学生对单个基础知识点的考查题答得较为理想, 选择题的答题情况总体较好，学生1,10题基本都能完成，第7题错的较多。 填空题最好的是第1题、第2题和第5题，这些题目的主要特征是只有一个知识点的计算类题目是纯技能考查，只涉及单个概念和计算，只要平时训练到位基本都能得分。其次是3、4、6，其中3题是学生较为熟悉的题型。 解答题基础的计算题和分析及作图都较为理想,计算题较好，23题是基本应用题，虽然解决过程中还是存在一些问题。但大部分学生还是能正确理解题意列出方程。比以往应用题的得分率略高。 (2)失分情况:主要问题集中在函数、几何、综合类题目. 1.表现在对基本概念的理解掌握不够清楚，如代数式和方程的概念混淆，不会分析应用。 2基本运算能力不过关，出错较多。 3.审题粗心，不能按要求解题，錯解漏解，答非所问。 4. 涉及阅读理解类题目整体得分率较低，对题目的理解能力和表达能力比较差，存在题意理解上的困难。

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人教版九年级英语上册期中考试试题及答案

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