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
米
B.0.251 10米 D.2.51 10
5
4
C.2.51 10米
5
米
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,
得
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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