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2026年安徽省蚌埠市中考数学二模试卷

  • 2026-05-05 15:08:56
2026年安徽省蚌埠市中考数学二模试卷

2026年安徽省中考数学模拟试卷

一、选择题(本大题共10小题,每小题4分,满分40分)

1.以下各数中,满足|x|<2的x是(  )

A.﹣2B.0C.2D.6

2.一个几何体由圆柱和正方体组成,其主视图、俯视图如图所示,则其左视图为(  )

3.“嫦娥六号样品首次揭示月背演化历史和巨型撞击效应”是2025年度“中国科学十大进展”之一,该研究取得多项原创突破,其中一项是识别出具有撞击成因的新型月球岩石,厘定月球最大撞击盆地——SPA盆地及其内部的阿波罗盆地分别形成于42.5亿年前和41.6亿年前,为认识月球早期撞击历史提供关键时标.其中“42.5亿”用科学记数法表示应为(  )

A.425×108B.4.25×108

C.4.25×109D.0.425×1010

4.下列计算正确的是(  )

A.(﹣m23=﹣m6B.m2m3m6

C.m2+m3m5D.(mn3mn3

5.如图,一束光线沿AB方向射入,经过平面镜CB,CD反射后,沿DE方向射出,已知∠1=26°,平面镜CB,CD的夹角∠BCD=120°,则∠2=(  )

A.36°B.34°C.22°D.24°

6.小明家养了6只羊,在统计这6只羊的质量(单位:千克)时,不小心一滴墨水落在数据“27,42,28,,37,38”中的一个数据上,小明记得这个数据是四十多,据此可以确定这组数据的(  )

A.平均数B.众数C.中位数D.方差

7.《九章算术》中记载,浮箭漏出现于汉武帝时期,它由漏壶(供水壶)和箭壶组成,箭壶内装有箭尺,水匀速地从供水壶流到箭壶,箭尺随箭壶中的水位匀速上浮,通过读取箭尺读数可指示时间,观察、记录数据如下表(未记录完整):

箭尺读数(cm

1

3.5

6

13.5

21

31

指示时间

7:00

8:00

9:00

12:00

19:00

则箭尺读数为21cm时,指示时间应为(  )

A.13:00B.15:00C.16:00D.17:00

8.“出入相补”原理是魏晋时期数学家刘徽创立.如图是刘徽用出入相补法证明勾股定理的“青朱出入图”,其中四边形ABCD,BEFG,AHIG均为正方形.若正方形AHIG的面积为29,AD=2,则△GFI的面积为(  )

A.15B.10C.D.5

9.已知反比例函数的图象如图所示,则一次函数ycxac≠0)和二次函数yax2+bx+ca≠0)在同一平面直角坐标系中的图象可能是(  )

10.如图,D为等边△ABC的边BC的中点,E,F分别在边AB,AC上,满足AECF.设EF的中点为M,线段AD,EF相交于点N,若AB=2,则以下结论错误的是(  )

A.MB+MC的最小值为

B.MBMC的最大值为

C.NB+NC的最小值为

D.NENF的最大值为

二、填空题(本大题共4小题,每小题5分,满分20分)

11.代数式有意义,x的取值范围是 .

12.若x=3,则 .

13.如图,PA,PB分别与O相切于A,B两点,若O的半径为2,∠P=60°,则图中阴影部分的面积为 .

14.PageRank算法是Google搜索引擎用来衡量网页重要性的一种经典算法,其核心思想是通过分析网页之间的链接关系,评估每个网页的相对重要性,假设一个小型的互联网由A,B,C,D四个网页组成,它们之间按图中的箭头方向等可能地单向链接,假设某用户从网页A开始浏览(记为第1次停留),则:

(1)该用户第2次停留在网页C上的概率为 ;

(2)该用户第4次停留在网页D上的概率为 .

三、(本大题共2小题,每小题8分,满分16分)

15.计算:

16.如图,在由边长为1个单位长度的小正方形组成的网格中,△ABC的顶点均为格点(网格线的交点).

(1)将线段BC向右平移3个单位,得到DE,请画出DE

(2)以点B为旋转中心,将△ABC按顺时针方向旋转90°,得到△A1BC1,画出△A1BC1

四.(本大题共2小题,每小题8分,满分16分)

17.为了解某辖区老人健康意识和锻炼习惯,随机调查了辖区内部分65岁以上老人一个月在本小区健身设施上的锻炼情况,统计了一个月来他们的锻炼次数,并将调查数据加以整理:

组别

锻炼次数x

频数

频率

A

0≤x≤4

8

0.16

B

4<x≤8

a

b

C

8<x≤12

16

0.32

D

12<x≤16

8

0.16

E

16<x≤20

4

0.08

F

20<x≤24

2

0.04

请根据以上信息解答下列问题:

(1)a ;b ;

(2)补全频数分布直方图;

(3)若A,B,C,D,E,F这六组数据的平均数分别为2,6,10,14,18,22,估计该小区65岁以上老人一个月的平均锻炼次数.

18.如图,将正方体的展开图放在平面直角坐标系xOy中,点A,B,C分别落在坐标轴上.

(1)求tan∠BAO的值;

(2)若OA=1,反比例函数的图象恰好经过点D,求k的值.

五、(本大题共2小题,每小题10分,满分20分)

19.图1是停车场入口处的升降杆,当汽车牌照框进入时,升降杆就会从水平位置升起,图2是其示意图,其中四边形BCDE是矩形,ABCD=3.3m,BC=1m,现由于故障,AB不能完全升起,∠ABE最大是42°(结果精确到0.1,参考数据:sin42°≈0.67,cos42°≈0.74,tan42°≈0.90).

(1)求故障时A点距离地面最高多少m

(2)若一辆箱式小货车宽1.8m,高2.4m,请问这辆车能否在升降杆故障时进入停车场?说明理由.

20.如图,AC,BDO的直径,PO上与A,B,C,D均不重合的点,PEAC于点E,PFBD于点F,AC=12.连接EF

(1)如图1,若PE的延长线经过点B,DF=3,求∠EPF的大小;

(2)如图2,若∠EPF=45°,求线段EF的长.

六、(本题满分12分)

21.为落实《中共中央国务院关于全面加强新时代大中小学劳动教育的意见》,某校成立了劳技兴趣小组,某次活动如下:用两块全等、周长均为40cm的矩形材料拼成如图所示的物件,其中矩形ABCD和矩形A1B1C1D1的对角线交点重合,ADA1D1,依次取AB,C1D1,CD,A1B1的中点,然后沿图中虚线剪去八个全等的小直角三角形,得到一个星状图形.

(1)当两个矩形重叠部分的四边形EFGH面积为36cm2时,求星状图形的面积;

(2)求星状图形周长的最小值.

七、(本题满分12分)

22.如图,在△ABC中,∠ACB=90°,边AB上的点满足:AD=4BD

(1)如图1,若ADAC,求tan∠A的值;

(2)如图2,已知∠ABC的平分线交CD于点E,EFCD,交AB于点F,连接CF.已知BFBC

判断△CEF的形状;

求证:AFFD

八、(本题满分14分)

23.综合探究

【提出问题】将数字1,2,3,4,5组成一个三位数和一个两位数,每个数字仅用一次.怎样分这5个数字,使组成的两个数的乘积最大?

【分析问题】

(1)简单情况:用三个不等的非零数字a,b,c组成一个两位数和一个一位数,每个数字仅用一次,怎样分这3个数字,使组成的两个数的乘积最大?

下边是一个两位数与一个一位数相乘的竖式图,其中a,b,c是互不相等的正整数.

c为已知数,要使得最大,则a,c乘积越大越好,故ab

b为已知数,要使最大,则b,c乘积越大越好,故ac

a为已知数,要使最大,则a,c乘积越大越好,故bc.(以上用“>”“<”填空)

因此,若最大,则a,b,c从大到小排列应为 .

(注:表示十位数为a,个位数为b的两位数,即.)

(2)拾阶而上:用四个不等的非零数字a,b,c,d组成两个两位数,每个数字仅用一次,怎样分这4个数字,使组成的两个数的乘积最大?

类似上面的分析过程可以知道,若使最大,则必有ac,bd,ad,bc

据此可知,满足题意的两个两位数,十位上的数字必是a,b,c,d中较大的两个数,个位数字是较小的两个数.

不妨设abcd,下面比较的大小.

……

完成上面的比较过程,从而得出:用1,2,3,4组成两个两位数,每个数字仅用一次,若这两个数乘积最大,则这两个数分别是 , ;

(3)得到结果:不妨将图中的分别看作A,B,同时考虑到最大,根据上面的分析过程,我们有:若图中的最大,则五个不同的非零数字a,b,c,d,e按由小到大排列应该为 .

【解决问题】

(4)根据以上分析,将数字1,2,3,4,5组成一个三位数和一个两位数,每个数字仅用一次,组成的两个数乘积的最大值为 .

【迁移应用】

(5)请利用下表所给5个不同的数字,按上面的要求,组成一个三位数和一个两位数,使这两个数的乘积最小

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声明:试题解析著作权属菁优网所有,未经书面同意,不得复制发布日期:2026/5/4 19:14:41;用户:mczl58;邮箱:ldwh135@xyom;学号:247370

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  1. CONNECT:[ UseTime:0.000670s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000781s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000328s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001494s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000661s ]
  6. SELECT * FROM `set` [ RunTime:0.000239s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001788s ]
  8. SELECT * FROM `article` WHERE `id` = 488433 LIMIT 1 [ RunTime:0.001314s ]
  9. UPDATE `article` SET `lasttime` = 1778136267 WHERE `id` = 488433 [ RunTime:0.004003s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000638s ]
  11. SELECT * FROM `article` WHERE `id` < 488433 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001100s ]
  12. SELECT * FROM `article` WHERE `id` > 488433 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002578s ]
  13. SELECT * FROM `article` WHERE `id` < 488433 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005123s ]
  14. SELECT * FROM `article` WHERE `id` < 488433 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001734s ]
  15. SELECT * FROM `article` WHERE `id` < 488433 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007712s ]
0.124783s