2009年四川省凉山州中考数学试题(word版含答案)

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2009年四川省凉山州中考数学试题(word版含答案)

2009年凉山州初中毕业、高中阶段招生统一考试

数 学 试 卷

本试卷共10页,分为A卷(100分)、B卷(20分),全卷满分120分,考试时间120分钟,A卷又分为第Ⅰ卷和第Ⅱ卷.

A卷(共100分) 第Ⅰ卷(选择题 共30分)

注意事项:

1.第Ⅰ卷答在答题卡上,不能答在试卷上.答卷前,考生务必将自己的姓名、准考证号、考试科目涂写在答题卡上.

2.每小题选出答案后,用2B或3B铅笔把答题卡上对应题目的答案标号涂黑.如需改动,用橡皮擦干净后,再选涂其它答案.

一、选择题:(共10个小题,每小题3分,共30分)在每个小题给出的四个选项中只有一项是正确的,请把正确选项的字母填涂在答题卡上相应的位置. 1.比1小2的数是( ) A. 1 B. 2 2.下列运算正确的是( ) A.a3 a4 a12 C.2a 3a a

C. 3

D.1

B.a6 a3 a2 D.(a 2)2 a2 4

3.长度单位1纳米 10 9米,目前发现一种新型病毒直径为25100纳米,用科学记数法表示该病毒直径是( ) A.25.1 10

6

B.0.251 10米 D.2.51 10

5

4

C.2.51 10米

5

4.小红上学要经过三个十字路口,每个路口遇到红、绿灯的机会都相同,小红希望上学时经过每个路口都是绿灯,但实际这样的机会是( ) A.

12

18

38

12

12

12

B. C. D.

建 设

和 谐 凉

山 (第5题)

5.一个正方体的平面展开图如图所示,将它折成正方体后“建”字对面是( )

A.和 B.谐 C.凉 D.山

6.一组数据3、2、1、2、2的众数,中位数,方差分别是( ) A.2,1,0.4 C.3,1,2

B.2,2,0.4 D.2,1,0.2

2009年四川省凉山州中考数学试题(word版含答案)

7.若ab 0,则正比例函数y ax与反比例函数y ( )

x

B. x

bx

在同一坐标系中的大致图象可能是x

x

8.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. 9.如图,将矩形ABCD沿对角线BD折叠,使C落在C 处,BC 交AD于E,则下列结论不一定成立的是( ) A A.AD BC

B. EBD EDB D.sin ABE

AEED

D C

B

(第9题)

C.△ABE∽△CBD

10.如图,⊙O是△ABC的外接圆,已知 ABO 50°,则 ACB的大小为( ) A.40° B.30° C.45° D.50°

(第10题)

2009年四川省凉山州中考数学试题(word版含答案)

2009年凉山州初中毕业、高中阶段招生统一考试

数 学 试 卷

第Ⅱ卷(非选择题 共70分)

注意事项:

1.答卷前将密封线内的项目填写清楚,准考证号前七位填在密封线方框内,末两位填在卷首方框内.

2.答题时用钢笔或圆珠笔直接答在试卷上.

二、填空题(共4小题,每小题3分,共12分)

11.分解因式9a a3 ,2x2 12x 18 .

12.已知△ABC∽△A B C 且S△ABC:S△A B C 1:2,则AB:A B = . 13.有两名学员小林和小明练习射击,第一轮10枪打完后两人打靶的环数如图所示,通常新手的成绩不太稳定,那么根据图中的信息,估计小林和小明两人中新手是 .

4 2 0

1 2 3 4 5 6 7 8 9 10

小明 小林 (第13题)

14.已知一个正数的平方根是3x 2和5x 6,则这个数是 . 三、解答题(共4小题,每小题7分,共28分)

12009

1 2cos45° 1) ( 1)15

.计算:|3.14 π| 3.14 . 2

16.先化简,再选择一个你喜欢的数(要合适哦!)代入求值: 1 x 1 1 .

x x

2

2009年四川省凉山州中考数学试题(word版含答案)

17.观察下列多面体,并把下表补充完整.

名称

三棱柱

四棱柱

五棱柱

六棱柱

图形

顶点数a

6 10

棱数b 9 12 面数c 5

观察上表中的结果,你能发现a、b、c之间有什么关系吗?请写出关系式.

18.如图,△ABC在方格纸中

12 8

(1)请在方格纸上建立平面直角坐标系,使A(2,3),C(6,2),并求出B点坐标; (2)以原点O为位似中心,相似比为2,在第一象限内将△ABC放大,画出放大后的图形△A B C ;

(3)计算△A B C 的面积S.

(第18题)

四、解答题(共2小题,每小题7分,共14分)

19.我国沪深股市交易中,如果买、卖一次股票均需付交易金额的0.5%作费用.张先生以每股5元的价格买入“西昌电力”股票1000股,若他期望获利不低于1000元,问他至少要等到该股票涨到每股多少元时才能卖出?(精确到0.01元)

20.已知一个口袋中装有7个只有颜色不同的球,其中3个白球,4个黑球. (1)求从中随机抽取出一个黑球的概率是多少?

(2)若往口袋中再放入x个白球和y个黑球,从口袋中随机取出一个白球的概率是求y与x之间的函数关系式.

14

2009年四川省凉山州中考数学试题(word版含答案)

五、解答题(共2小题,每小题8分,共16分)

21.如图,要在木里县某林场东西方向的两地之间修一条公路MN,已知C点周围200米范围内为原始森林保护区,在MN上的点A处测得C在A的北偏东45°方向上,从A向东走600米到达B处,测得C在点B的北偏西60°方向上.

(1)MN

1.732)

(2)若修路工程顺利进行,要使修路工程比原计划提前5天完成,需将原定的工作效率提高25%,则原计划完成这项工程需要多少天?

22.如图,在平面直角坐标系中,点O1的坐标为( 4,以点O1为圆心,8为半径的圆与x0),轴交于A,B两点,过A作直线l与x轴负方向相交成60°的角,且交y轴于C点,以点

O2(13,5)为圆心的圆与x轴相切于点D.

C

M

A

(第21题)

B

N

(1)求直线l的解析式;

(2)将⊙O2以每秒1个单位的速度沿x轴向左平移,当⊙O2第一次与⊙O1外切时,求⊙O2平移的时间.

2009年四川省凉山州中考数学试题(word版含答案)

B卷(共20分)

六、填空题(共2小题,每小题3分,共6分)

x a 2

23.若不等式组

的解集是 1 x 1,则(a b)2009 .

b 2x 0

24.将△ABC绕点B逆时针旋转到△A BC 使A、B、C 在同一直线上,若

2

BCA 90°, BAC 30° cm. A

C B

(第24题)

七、解答题(共2小题,25题4分,26题10分,共14分)

25.我们常用的数是十进制数,如4657 4 103 6 102 5 101 7 100,数要用10个数码(又叫数字):0、1、2、3、4、5、6、7、8、9,在电子计算机中用的二进制,只要两个数码:0和1,如二进制中110 1 22 1 21 0 20等于十进制的数6,那么二进制中的110101 1 2 1 2 0 2 1 2 0 2 1 2等于十进制的数53.数101011等于十进制中的哪个数?

26.如图,已知抛物线y x bx c经过A(1,0),B(0,2)两点,顶点为D. (1)求抛物线的解析式;

(2)将△OAB绕点A顺时针旋转90°后,点B落到点C的位置,将抛物线沿y轴平移后经过点C,求平移后所得图象的函数关系式;

(3)设(2)中平移后,所得抛物线与y轴的交点为B1,顶点为D1,若点N在平移后的抛物线上,且满足△NBB1的面积是△NDD1面积的2倍,求点N的坐标.

2

543210

2009年四川省凉山州中考数学试题(word版含答案)

2009年凉山州初中毕业、高中阶段招生统一考试

数学参考答案及评分意见

说明:

一、如果考生的解法与下面提供的参考解答不同,凡正确的,一律记满分;若某一步出现错误,则可参照该题的评分意见进行评分.

二、评阅试卷,不要因解答中出现错误而中断对该题的评阅,当解答中某一步出现错误,影响了后继部分但该步以后的解答未改变这一道题的内容和难度,在未发生新的错误前,可视影响的程度决定后面部分的记分,这时原则上不应超过后面部分应给分数之半,明显笔误,可酌情少扣;如有严重概念性错误,就不记分.在这一道题解答过程中,对发生第二次错误的部分,不记分.

三、涉及计算过程,允许合理省略非关键步骤.

四、以下各题解答中右端所注分数,表示考生正确做到这一步应得的累加分数.

A卷(共100分)

一、选择题:(共10个小题,每小题3分,共30分) 1.A 2.C 3.D 4.B 5.D 6.B 7.B 8.D 9.C 10.A 二、填空题(共4个小题,每小题3分,共12分) 11.a(3 a)(3 a) 2(x 3)2 12

.1:13.小林 14.三、解答题(共4个小题,每小题7分,共28分) 15

.计算:原式 (3.14 π) 3.14 1 2

2

( 1) ································ 3分

494

π 3.14 3.14 12 1

1 ······················································ 5分

π 1 1············································································ 6分

π ······································································································ 7分

1 x 1x 1(x 1)(x 1)

16.解: 1 ··························································· 3分

x xxx

2

x 1x

1x 1

x(x 1)(x 1)

···························································· 4分

··················································································· 5分

2009年四川省凉山州中考数学试题(word版含答案)

取x 2时,原式

12 1

1.

(学生取除1以外的值计算正确均给分)······································································ 7分 17.

名称

顶点数a

三棱柱

四棱柱 8

五棱柱

六棱柱

棱数b 15 18 面数c 6 7 表中每空1分. ············································································································ 5分

a c b 2(与此式等价的关系式均给分) ······························································· 7分

18.(1)画出原点O,x轴、y轴. ············································································ 1分 ························································································································· 2分 B(2,1)·(2)画出图形△A B C .··························································································· 5分 (3)S

12

(第18题答图)

4 8 16. ···························································································· 7分

四、解答题(共2小题,每小题7分,共14分)

19.解:设至少涨到每股x元时才能卖出. ·································································· 1分 根据题意得1000x (5000 1000x) 0.5%≥5000 1000 ········································· 4分 解这个不等式得x≥

1205199

,即x≥6.06. ·································································· 6分

答:至少涨到每股6.06元时才能卖出. ········································································ 7分 20.解:(1)取出一个黑球的概率P

43 4

47

·························································· 2分

(2) 取出一个白球的概率P

3 x7 x y

··································································· 4分

3 x7 x y

14

··········································································································· 5分

·································································································· 6分

12 4x 7 x y ·

2009年四川省凉山州中考数学试题(word版含答案)

y与x的函数关系式为:y 3x 5. ······································································· 7分 五、解答题(共2小题,每小题8分,共16分)

21.(1)理由如下: 如图,过C作CH⊥AB于H,设CH x, C

由已知有 EAC 45°, FBC 60°

则 CAH 45°, CBA 30°,························· 1分 在Rt△ACH中,AH CH x, 60

在Rt△HBC中,tan HBC

CHHB

M

A

H

B

(第21题答图)

HB CHtan x, ·

····································································· 3分 30°

·············3

AH HB AB

x

600解得x

600220(米)>200(米)

. MN不会穿过森林保护区.······················································································· 5分

(2)解:设原计划完成这项工程需要y天,则实际完成工程需要(y 5)天.

根据题意得:

1y (1 25%) 15

y

············································································· 7分

解得:y 25

经检验知:y 25是原方程的根.

答:原计划完成这项工程需要25天. ··········································································· 8分 22.(1)解:由题意得OA | 4| |8| 12,

A点坐标为( 12,0).

在Rt△AOC中, OAC 60°,

OC OAtan OAC 12 tan60°

C点的坐标为(0, .······························· 1分

设直线l的解析式为y kx b, 由l过A、C两点,

b

0 12k b

N

2009年四川省凉山州中考数学试题(word版含答案)

b 解得 k ·································································· 3分 直线l

的解析式为:y ·

(2)如图,设⊙O2平移t秒后到⊙O3处与⊙O1第一次外切于点P,

⊙O3与x轴相切于D1点,连接O1O3,O3D1.

则O1O3 O1P PO3 8 5 13

O3D1⊥x轴, O3D1 5,

在Rt△

O1O3D1中,O1D1

12.···································· 6分

O1D O1O OD 4 13 17, D1D O1D O1D1 17 12 5, t

51

5(秒)

⊙O2平移的时间为5秒. ························································································· 8分

B卷(共20分)

六、填空题(共2小题,每小题3分,共6分)

23. 1 24. 4π

七、解答题(共2小题,25题4分,26题10分,共14分)

25.解:101011 1 2 0 2 1 2 0 2 1 2 1 2···································· 3分

32 0 8 0 2 1

43 ·································································································· 4分

5

4

3

2

1

26.解:(1)已知抛物线y x bx c经过A(1,0),B(0,2),

0 1 b c b 3 解得

2 0 0 cc 2

2

································································· 2分 所求抛物线的解析式为y x 3x 2. ·(2) A(1,0),B(0,2), OA 1,OB 2

可得旋转后C点的坐标为(3,····················································································· 3分 1)·

2

2009年四川省凉山州中考数学试题(word版含答案)

当x 3时,由y x2 3x 2得y 2, 可知抛物线y x2 3x 2过点(3,2)

将原抛物线沿y轴向下平移1个单位后过点C.

2

··························································· 5分 平移后的抛物线解析式为:y x 3x 1.·

2

(3) 点N在y x2 3x 1上,可设N点坐标为(x0,x0 3x0 1)

33 5

将y x 3x 1配方得y x , 其对称轴为x . ····························· 6分

22 4

2

2

①当0 x0

32

时,如图①,

S△NBB1 2S△NDD1

12

1 x0 2

1

3

1 x0 2 2

图①

x0 1

2

此时x0 3x0 1 1

N点的坐标为(1,···························································································· 8分 1). ·

②当x0 同理可得

32

时,如图②

1

3

x0 2 2

12

1 x0 2

图②

x0 3

2

此时x0 3x0 1 1

点N的坐标为(3,1).

综上,点N的坐标为(1,········································································10分 1)或(3,1). ·

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