2007年上海市数学中考试题及答案解析

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在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

2007年上海市初中毕业生统一学业考试

数学试卷

(满分150分,考试时间100分钟) 2007-6-20

一、填空题:(本大题共12题,满分36分)(只要求直接写出结果,每个空格填对得3分,

否则得零分) 1.计算:2 .

2.分解因式:2a 2ab .

2

11 xx 1

3

4.已知函数f(x) ,则f(1) .

x 2

3.化简:5.函数y

2

6.若方程x 2x 1 0的两个实数根为x1,x2,则x1 x2 . 7 2的根是

8.如图1,正比例函数图象经过点A,该函数解析式是.

B

图2

图1

9.如图2,E为平行四边形ABCD的边BC延长线上一点,连结AE,交边CD于点F.在不添加辅助线的情况下,请写出图中一对相似三角形: .

10.如果两个圆的一条外公切线长等于5,另一条外公切线长等于2a 3,那么a . 11.如图3,在直角坐标平面内,线段AB垂直于y轴,垂足为B,且AB 2,如果将线段AB沿y轴翻折,点A落在点C处,那么点C的横坐标是 .

图3

图4

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在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

12.图4是4 4正方形网格,请在其中选取一个白色的单位正方形并涂黑,使图4中黑色部分是一个中心对称图形. 二、选择题:(本大题共4题,满分16分)

【下列各题的四个结论中,有且只有一个结论是正确的,把正确结论的代号写在题后的圆括号内,选对得4分;不选、错选或者多选得零分】 13 ) A

B

C

D14.如果一次函数y kx b的图象经过第一象限,且与y轴负半轴相交,那么( ) A.k 0,b 0

B.k 0,b 0

C.k 0,b 0

D.k 0,b 0

15.已知四边形ABCD中,∠A ∠B ∠C 90,如果添加一个条件,即可推出该四边形是正方形,那么这个条件可以是( ) A.∠D 90

B.AB CD

C.AD BC

D.BC CD

16.小明不慎把家里的圆形玻璃打碎了,其中四块碎片如图5所示,为配到与原来大小一样的圆形玻璃,小明带到商店去的一块玻璃碎片应该是( ) A.第①块 B.第②块 C.第③块 D.第④块 三、(本大题共5题,满分48分) 17.(本题满分9分) 图5

3 x 0,

解不等式组: 4x3x并把解集在数轴上表示出来.

, 6 32

18.(本题满分9分)

x2 3x2x 1

0. 解方程:2

x 1x 1

19.(本题满分10分,第(1)小题满分6分,第(2)小题满分4分)

0),如图6,在直角坐标平面内,O为原点,点A的坐标为(10,点B在第一象限内,BO 5,3sin∠BOA .

5

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图6

在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

求:(1)点B的坐标;(2)cos∠BAO的值. 20.(本题满分10分,第(1)小题满分4分,第(2),(3)小题满分各3分)

初三学生小丽、小杰为了解本校初二学生每周上网的时间,各自在本校进行了抽样调查.小丽调查了初二电脑爱好者中40名学生每周上网的时间,算得这些学生平均每周上网时间为2.5小时;小杰从全体初二学生名单中随机抽取了40名学生,调查了他们每周上网的时间,算得这些学生平均每周上网时间为1.2小时.小丽与小杰整理各自样数据,如表一所示.请根据上述信息,回答下列问题:

(1)你认为哪位学生抽取的样本具有代表性?答: ; 估计该校全体初二学生平均每周上网时间为 小时;

(2)根据具体代表性的样本,把图7中的频数分布直方图补画完整; (3)在具有代表性的样本中,中位数所在的时间段是 小时/周.

时间段 小丽抽样 小杰抽样

(小时/周) 人数 人数 6 22 0~1

10 10 1~2

16 6 2~3 8 2 3~4 (每组可含最低值,不含最高值)

表一

小时/周

(每组可含最低值,不含最高值)

图7

21.(本题满分10分)

2001年以来,我国曾五次实施药品降价,累计降价的总金额为269亿元,五次药品降价的年份与相应降价金额如表二所示,表中缺失了2003年、2007年相关数据.已知2007年药品降价金额是2003年药品降价金额的6倍,结合表中信息,求2003年和2007年的药品降价金额.

2001 2003 2004 2005 2007 年份

54 35 40 降价金额(亿元)

表二

四、(本大题共4题,满分50分) 22.(本题满分12分,每小题满分各6分)

0). , 4),且过点B(3,在直角坐标平面内,二次函数图象的顶点为A(1

(1)求该二次函数的解析式;

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在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

(2)将该二次函数图象向右平移几个单位,可使平移后所得图象经过坐标原点?并直接写出平移后所得图象与x轴的另一个交点的坐标. 23.(本题满分12分,每小题满分各6分)

如图8,在梯形ABCD中,AD∥BC,CA平分∠BCD,DE∥AC,交BC的延长线于点E,∠B 2∠E. (1)求证:AB DC; (2)若tgB

2,AB BC的长. 24.(本题满分12分,每小题满分各4分) 如图9,在直角坐标平面内,函数y

8

m

,4),B(a,b),x 0,m是常数)的图象经过A(1

x

其中a 1.过点A作x轴垂线,垂足为C,过点B作y轴垂线,垂足为D,连结AD,DC,

(1)若△ABD的面积为4,求点B的坐标; (2)求证:DC∥AB;

(3)当AD BC时,求直线AB的函数解析式.

图9 25.(本题满分14分,第(1)小题满分4分,第(2),(3)小题满分各5分)

已知:∠MAN 60,点B在射线AM上,AB 4(如图10).P为直线AN上一动点,

CB.

以BP为边作等边三角形BPQ(点B,P,Q按顺时针排列),O是△BPQ的外心. (1)当点P在射线AN上运动时,求证:点O在∠MAN的平分线上;

P x,(2)当点P在射线AN上运动(点P与点A不重合)时,AO与BP交于点C,设A

AC AO y,求y关于x的函数解析式,并写出函数的定义域;

(3)若点D在射线AN上,AD 2,圆I为△ABD的内切圆.当△BPQ的边BP或

BQ

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中小学课外辅导专家

与圆I相切时,请直接写出点A与点O的距离.

10

备用图

2007年上海市初中毕业生统一学业考试

数学试卷答案要点与评分标准

说明:

1.解答只列出试题的一种或几种解法.如果考生的解法与所列解法不同,可参照解答中评分标准相应评分.

2.第一大题只要求直接写出结果,每个空格填对得3分,否则得零分;第二大题每题选对得4分,不选、错选或者多选得零分;17题至25题中右端所注的分数,表示考生正确做对这一步应得分数,评分时,给分或扣分均以1分为单位. 答案要点与评分标准

一、填空题(本大题共12题,满分36分) 1.3 2.2a(a b) 3.

1

4.1 5.x≥2 6.2 7.x 3

x(x 1)

8.y 3x 9.△AFD∽△EFC(或△EFC∽△EAB,或△EAB∽△AFD) 10.1 11. 2 12.答案见图1

1

二、选择题(本大题共4题,满分16分) 13. C 14.B 15.D 16.B 三、(本大题共5题,满分48分)

蓝舰精品小班 蓝舰一对一辅导

在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

17.解:由3 x 0,解得x 3. ····················································································· 3分

4x3x

,解得x 1. ·························································································· 3分 326

························································································· 1分 不等式组的解集是 1 x 3.

解集在数轴上表示正确. ······································································································· 2分 18.解:去分母,得x2 3x (2x 1)(x 1) 0, ···························································· 3分 整理,得3x 2x 1 0, ··································································································· 2分

2

1. ······························································································ 2分 3

11

经检验,x1 1是增根,x2 是原方程的根, 原方程的根是x . ·················· 2分

33

19.解:(1)如图2,作BH OA,垂足为H, ······························································ 1分

3

在Rt△OHB中, BO 5,sin BOA ,

5

BH 3. ··························································································································· 2分 OH 4.……………………………… 1分

解方程,得x1 1,x2

3).……………………2分 点B的坐标为(4,

(2) OA 10,OH 4, AH 6.………………1分 在Rt△AHB中,

BH 3, AB 1分

x

cos BAO

AH2分

AB20.(1)小杰;1.2. ··································································································· 2分,2分

(2)直方图正确. ················································································································· 3分 (3)0~1. ······························································································································ 3分 21.解:[解法一]设2003年和2007年的药品降价金额分别为x亿元、y亿元. ············· 1分 根据题意,得

y 6x ………………………………………………………………2分

54 x 35 40 y 269 ………………………………………………2分

解方程组,得

x 20 ………………………………………………………………………2分

y 120 ………………………………………………………………………2分

答:2003年和2007年的药品降价金额分别为20亿元和120亿元. ·································· 1分

[解法二]设2003年的药品降价金额为x亿元, ···································································· 1分 则2007年的药品降价金额为6x亿元. ················································································ 2分 根据题意,得54 x 35 40 6x 269. ······································································· 2分 解方程,得x 20, 6x 120. ······················································································ 4分 答:2003年和2007年的药品降价金额分别为20亿元和120亿元. ·································· 1分

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在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

四、(本大题共4题,满分50分)

22.解:(1)设二次函数解析式为y a(x 1)2 4, ······················································· 2分

0), 0 4a 4,得a 1. ···················································· 3分 二次函数图象过点B(3,

············································· 1分 二次函数解析式为y (x 1)2 4,即y x2 2x 3. ·

(2)令y 0,得x 2x 3 0,解方程,得x1 3,x2 1. ································· 2分

2

0)和( 1,0). 二次函数图象与x轴的两个交点坐标分别为(3,

························································ 2分 二次函数图象向右平移1个单位后经过坐标原点. ·

0). ·平移后所得图象与x轴的另一个交点坐标为(4,·························································· 2分

23.(1)证明: DE∥AC, BCA E. ·················································································································· 1分 CA平分 BCD, BCD 2 BCA, ·········································································································· 1分 BCD 2 E, ··············································································································· 1分 又 B 2 E, B BCD. ·················································································································· 1分

······································································· 2分 梯形ABCD是等腰梯形,即AB DC. ·

(2)解:如图3,作AF BC,DG BC, 垂足分别为F,G,则AF∥DG.

在Rt△AFB中,tgB 2, AF 2BF.…………1分

又 AB ,且AB AF BF,

2

2

2

5 4BF BF,得BF 1.……………………1分

同理可知,在Rt△DGC中,CG 1.……………1分 AD∥BC, DAC ACB.

又 ACB ACD, DAC ACD, AD DC.

22

图3

····················································································· 1分

DC AB AD .·

AD∥BC,AF∥DG, 四边形AFGD

是平行四边形, FG AD ······ 1分

··················································································· 1分 BC BF FG GC 2 ·24.(1)解: 函数y

m

(x 0,m是常数)图象经过A(1,4), m 4. ··············· 1分

x

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在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

设BD,AC交于点E,据题意,可得B点的坐标为 a ,D点的坐标为 0 ,

4 a 4 a

········································································································· 1分 E点的坐标为 1 , ·

4

a

a 1, DB a,AE 4

由△ABD的面积为4,即

4. a

1 4

····································································· 1分 a 4 4, ·

2 a 4 3

得a 3, 点B的坐标为 3 . ···················································································· 1分

,0),DE 1, (2)证明:据题意,点C的坐标为(1 a 1,易得EC

4

,BE a 1, a

44

BEa 1AE a 1. · a 1,··································································· 2分

4DE1CE

a

BEAE . ······················································································································· 1分 DECE DC∥AB. ······················································································································· 1分 (3)解: DC∥AB, 当AD BC时,有两种情况: ①当AD∥BC时,四边形ADCB是平行四边形,

BEAE

a 1, a 1 1,得a 2. 由(2)得,

DECE

. ···································································································· 1分 点B的坐标是(2,2)

设直线AB的函数解析式为y kx b,把点A,B的坐标代入,

4 k b, k 2,

解得

2 2k b b 6.

·········································································· 1分 直线AB的函数解析式是y 2x 6. ·

②当AD与BC所在直线不平行时,四边形ADCB是等腰梯形, 则BD AC, a 4, 点B的坐标是(4,1). ························································· 1分 设直线AB的函数解析式为y kx b,把点A,B的坐标代入,

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中小学课外辅导专家

4 k b, k 1,

解得

1 4k b.b 5

············································································ 1分 直线AB的函数解析式是y x 5. ·

综上所述,所求直线AB的函数解析式是y 2x 6或y x 5. 25.(1)证明:如图4,连结OB,OP,

O是等边三角形BPQ的外心, OB OP, ································································ 1分

360

120 . 圆心角 BOP 3

当OB不垂直于AM时,作OH AM,OT AN,垂足分别为H,T. 由 HOT A AHO ATO 360,且 A 60,

AHO ATO 90 , HOT 120 .

BOH POT. ··········································································································· 1分 Rt△BOH≌Rt△POT. ······························································································· 1分 OH OT. 点O在 MAN的平分线上. ·································································· 1分

当OB AM时, APO 360 A BOP OBA 90.

即OP AN, 点O在 MAN的平分线上.

综上所述,当点P在射线AN上运动时,点O在 MAN的平分线上.

图4

(2)解:如图5,

图5

AO平分 MAN,且 MAN 60 ,

BAO PAO 30 . ··································································································· 1分

由(1)知,OB OP, BOP 120,

CBO 30 , CBO PAC.

蓝舰精品小班 蓝舰一对一辅导

在上海的话,很多人都会选择蓝舰教育,他们是小班人数一般都在10-15个人,老师的话他们都是聘请上海这边经验丰富的区市重点的在职老师,讲课风趣幽默很能调动学生的兴趣,并且每个老师都考纲,课改这些都把握的非常好。因为人数少,一般有什么问题课间和下课时间都可以问,老师都会很耐心的讲解。

中小学课外辅导专家

BCO PCA, AOB APC. ········································································ 1分 △ABO∽△ACP. ABAO . AC AO AB AP. y 4x. ·························································· 1分 ACAP

定义域为:x 0. ················································································································ 1分

(3)解:①如图6,当BP与圆I

相切时,AO ·················································· 2分 ②如图7,当BP与圆I

相切时,AO

; ································································· 1分 ③如图8,当BQ与圆I相切时,AO 0. ······································································· 2分

图6

P(A)

M

图7

图8

蓝舰精品小班 蓝舰一对一辅导

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