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2026年安徽省安师联盟中考数学一模试卷(B卷)

  • 2026-04-01 09:13:51
2026年安徽省安师联盟中考数学一模试卷(B卷)

2026年安徽省安师联盟中考数学一模试卷(B卷)

一、选择题

1.在0,﹣1,﹣2,﹣3,这四个数中,比﹣2.5小的数是(  )

A.0B.﹣1C.﹣2D.﹣3

2.2025年前三季度,安徽省货物贸易进出口总值7262.5亿元,同比增长15.7%.将7262.5亿元用科学记数法表示为(单位:元)(  )

A.7.2625×1010B.7.2625×1011

C.7.2625×1012D.7.2625×1013

3.某款饮水机的示意图如图所示,则它的左视图是(  )

4.下列计算结果正确的是(  )

A.B.a3a2a6

C.(﹣a43a12D.

5.若关于x的方程x2﹣2x+a=0没有实数根,则a的值可以为(  )

A.﹣4B.C.0D.2

6.如图,抛物线yax2+bx+ca,b,c是常数且a≠0)的部分图象与x轴交于点(﹣2,0),则方程ax2+bx+c=0的解为(  )

A.x1=2,x2=﹣4B.x1=2,x2=4

C.x1=﹣2,x2=4D.x1=﹣2,x2=2

7.点(t2+3,y1),(2t,y2)在一次函数的图象上,其中t为实数,则y1y2的大小关系为(  )

A.y1y2B.y1y2C.y1y2D.无法确定

8.如图,在Rt△ABC中,∠B=90°,∠C=30°,D为边AC的中点,EBC边上一点.若DE,则CE的长为(  )

A.B.1C.D.

9.如图,点E,FABCD的边CD上的两点,连接AE,BF交于点O,△AOB的面积为18,,则ABCD的面积为(  )

A.45B.48C.50D.52

10.如图,在△ABC中,∠BAC=90°,ABAC=2,△ADE的顶点DBC上运动,且∠ADE=90°,ADDE,直线AE与直线BC相交于点F,连接BE,在点D运动过程中,以下结论错误的是(  )

A.△ABE的面积等于△ABC的面积

B.△ABE的周长最小值为

C.BE的最大值为

D.DF2BD2+FC2

二、填空题(本大题共4小题,每小题5分,满分20分)

11.计算: .

12.如图,A,B是双曲线k是常数且k≠0)上两点,线段AB经过原点,BCx轴,ACBC于点C,若△ABC的面积为10,则k的值为 .

13.如图,某圆形景区有A,B,C三个入口,D,E两个出口,小明任选一个入口进入景区,游玩后任选一个出口离开,则他选择的入口和出口相邻(两者之间没有其他出口或入口,如AD相邻)的概率是 .

14.对于正整数n,根据n的奇偶性和取值,分以下三种情况得到另一个正整数m;若n是偶数,则;若n是奇数且n>1,则mn﹣1;若n=1,则m=1.这种得到m的过程称为对n进行一次“变换”,对所得的数m再进行一次变换称为对n进行二次变换,以此类推.例如,正整数n=5,由于5是奇数且大于1,则m=5﹣1=4,即对5进行一次变换得到的数是4;4是偶数,则,即对5进行二次变换得到的数为2.

(1)对正整数12进行三次变换,得到的数为 ;

(2)若对正整数n进行二次变换得到的数为1,则所有满足条件的n的值之和为 .

三、(本大题共2小题,每小题8分,满分16分)

15.先化简,再求值:,其中a=3.

16.如图是7×4的正方形网格,△ABC的三个顶点都在格点上,请仅用无刻度的直尺按要求完成以下作图.

(1)在图中的线段BC上找一点D,连接AD,使AD平分△ABC的面积;

(2)若每个小正方形的边长为1,则在(1)的条件下,直接写出△ABD的面积.

四、(本大题共2小题,每小题8分,满分16分)

17.一辆高空作业的工作示意图如图所示,支撑点A距地面MN有1.2m,主臂AB与水平面的夹角∠BAF=45°,与BC的夹角∠ABC=82°,AB=10m,BC=15m,求吊篮的边沿点C到地面MN的距离(结果精确到0.1m).(参考数据:sin82°≈0.99,cos82°≈0.14,tan82°≈7.12,sin37°≈0.60,cos69°≈0.80,

18.如图,一次函数yx+2的图象与x轴交于点A,与反比例函数的图象交于点Bn,4),点C的坐标为(3,0).

(1)求反比例函数的表达式;

(2)连接CB并延长交反比例函数的图象于点D,求证:BDBC

五、(本大题共2小题,每小题10分,满分20分)

19.联合国教科文组织将4月23日定为“世界图书与版权日”,又称“世界读书日”,以促进阅读、出版和文化保护.某校为培养学生阅读习惯,提升人文素养,举行了“书香校园,悦读人生”的阅读知识竞赛.参赛年级为七年级和八年级,现从该校七、八年级中各随机抽取m位同学的竞赛成绩(百分制),分数均为整数),分成四组:A组(60≤x<70);B组(70≤x<80);C组(80≤x<90);D组(90≤x≤100),将所得数据进行收集、整理、描述和分析,部分信息如下:

【信息1】

八年级抽取的学生的竞赛成绩在C组中的数据分别是84,84,81,83,85,89.

【信息2】

七、八年级抽取的学生竞赛成绩统计表

年级

七年级

八年级

平均数

91

90

中位数

88.5

n

众数

99

98

根据以上信息,解答下列问题:

(1)m ,n ;

(2)若该中学七年级有600人,八年级有400人参加了此次竞赛活动.请估算出参加此次竞赛活动全体学生的平均分.

20.如图,ABO直径,C,DO上的两点,且CEO的切线,CEDBDB的延长线于点E

(1)求证:∠ACD=2∠A

(2)若AB=5,BE=1,求BD的长.

六、(本题满分12分)

21.综合与实践

【活动背景】数学活动课上,老师问了这样一个问题:同学们,某小区有三栋居民楼A,B,C,如图1是小区的居民楼分布示意图,其中AC=90m,BC=135m,∠ACB=60°,为了方便小区居民购物,社区有关部门决定在小区内修建一个超市,你们觉得超市应该如何选址呢?

【方案讨论】

(1)初始方案:有部分同学提出,设超市的选址为P点,为了体现公平性,点PA,B,C三个顶点的距离应该要相等.此时,点P应选择在△ABC处(从“内心”,“外心”,“重心”中选择一个填空).

(2)方案改进:很快同学们发现,初始方案的选址方式看起来比较公平,但是总路程较长,于是,同学们想找到一个点,使它到△ABC三个顶点的距离之和最小,结合所学知识,同学们进行了以下的探究过程:

探究:如图2,把△APCC点顺时针旋转60°得到△APC,连接PP′,则∠PCP′=60°,

②,

∴△CPP′为等边三角形.

PCPP′.

又∵PAPA′,

PA+PB+PC

A′可看成是线段ACC点顺时针旋转60°而得的定点,BA′为定长.

∴当B,P,P′,A′四点在同一直线上时,PA+PB+PC最小,

PA+PB+PC的最小值就是线段BA′的长度.

【问题解决】

(1)请将上述【方案讨论】中横线上所缺内容补充完整: ; ; ;

(2)由以上探究过程可知,如图3,我们只要以AC为边向外作等边三角形ACA′,连接BA′,此时点P位于线段BA′上,请在此基础上通过尺规作图找出点P的位置.(保留作图痕迹)

(3)在图3的基础上求出PA+PB+PC的最小值.

七、本题满分12分

22.如图1,四边形ABCD和四边形CDEF均为正方形,点G为对角线DF上一点,且DGDC,连接AG,过点DDH平分∠CDF,DIAG,分别交AG于点H,I,连接BH

(1)若DI=1,求tan∠DAI

(2)求证:∠DHB=90°;

(3)如图2,延长DHCF于点J,求证:点HDJ的中点.

八、(本题满分14分)

23.已知抛物线yx2+2bx+1﹣4b的对称轴在y轴左侧,若将此抛物线向上平移4个单位后,顶点刚好在x轴上.

(1)求b的值;

(2)当mxm+2时,原函数y的最大值等于12,求m的值;

(3)原抛物线与x轴交于A,B两点(AB的左侧),与y轴交于点C,点P为第三象限内抛物线上一点,连接AC,BP交于点D.判断:是否有最大值,如有请求出最大值,如没有请说明理由.

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  1. CONNECT:[ UseTime:0.000573s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000806s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000296s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000239s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000564s ]
  6. SELECT * FROM `set` [ RunTime:0.000220s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000641s ]
  8. SELECT * FROM `article` WHERE `id` = 469070 LIMIT 1 [ RunTime:0.000555s ]
  9. UPDATE `article` SET `lasttime` = 1775088383 WHERE `id` = 469070 [ RunTime:0.004096s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001899s ]
  11. SELECT * FROM `article` WHERE `id` < 469070 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000958s ]
  12. SELECT * FROM `article` WHERE `id` > 469070 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000426s ]
  13. SELECT * FROM `article` WHERE `id` < 469070 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001632s ]
  14. SELECT * FROM `article` WHERE `id` < 469070 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004123s ]
  15. SELECT * FROM `article` WHERE `id` < 469070 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001460s ]
0.089908s