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2026年包头市一模数试卷

  • 2026-03-12 12:31:27
2026年包头市一模数试卷

包头市一模数学试卷(试题部分)

试卷类型: A

绝密 启用前

2026年普通高等学校招生全国统一考试(第一次模拟考试)

数 学

注意事项:

  1. 考生答卷前,务必将自己的姓名、座位号写在答题卡上。将条形码粘贴在规定区域。本试卷满分150分,考试时间120分钟。
  2. 做选择题时,选出每小题答案后,用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,再选涂其他答案标号。写在本试卷上无效。
  3. 回答非选择题时,将答案写在答题卡的规定区域内,写在本试卷上无效。
  4. 考试结束后,将答题卡交回。

一、选择题:本题共8小题,每小题5分,共40分。在每小题给出的四个选项中,只有一项是符合题目要求的。

1. 若i为虚数单位,则(1+i)(1+i)=
A. 2    B. 0    C. 2+2i    D. 2-2i

2. 设全集U=R,集合A={x | -1 < x < 4},B={x | y=ln(x-2)},则A∩(CUB)=
A. (-∞, 4)    B. (2, 4)    C. (-1, +∞)    D. (-1, 2]

3. 若a,b为非零向量,则"a//b"是"|a+b|=|a|+|b|"的
A. 必要不充分条件  B. 既不充分也不必要条件
C. 充分不必要条件  D. 充要条件

4. 记Sn为正项等比数列{an}的前n项和,已知4Sn=5(a8+a9),则该数列的公比为
A. 4    B. 3    C. 2    D. 1

5. 边长为2的等边三角形ABC的外心为O,则OA·AB=
A. -2    B. 2    C. 2√3    D. -√3

6. 已知直线l:3x+4y-2=0与圆C:x²+y²-2x-2y-2=0相交于A,B两点,则劣弧AB的长为
A. π/2    B. π    C. 2π    D. 3π/2

7. 已知函数f(x)={ -x+4x, x≤4; log₂(x-3), x>4 },若关于x的方程f(x)=t有四个实根x₁,x₂,x₃,x₄ (x₁A. x₂+x₃=9    B. 0<t≤4    c. ln((x₃-4)="" (x₄-4))="" <="" span="">

8. 袋中有9个除了颜色外完全相同的小球,其中有3个白球,2个红球,4个黄球,从中不放回地取球,每次取一个球,当三种颜色的球都取到时停止,记停止时取出的球的个数为X,则P(X=5)=
A. 1/21    B. 3/64    C. 13/63    D. 4/63

二、选择题:本题共3小题,每小题6分,共18分。在每小题给出的四个选项中,有多项符合题目要求。全部选对的得6分,部分选对的得部分分,有选错的得0分。

9. 已知函数f(x)=3tan(2x-π/4)+1,则
A. f(π/8)=4    B. f(x)的最小正周期为π/2
C. f(x)图象的对称中心为(kπ/2+π/8, 1) (k∈Z)
D. 不等式f(x)≤4的解集为{x | kπ/2-π/8 ≤ x ≤ kπ/2+3π/8, k∈Z}

10. 设等差数列{an}的前n项和为Sn,公差为d,首项为a1,若S9>S10且S15<0,则下列结论正确的是
A. d<0    B. 当n=5时,Sn取最大值
C. |a5| < |a6|    D. 数列{an/n}为等差数列并且与数列{an}具有相同的单调性

11. 在长方体ABCD-A1B1C1D1中,AB=BC=AA1=1,点E为CC1的中点,点P为平面ADD1A1内的一个动点(含边界),则
A. B1E//平面A1BD    B. 四棱锥E-BB1D1D的外接球的表面积为8π
C. 平面ABE⊥平面A1B1E    D. 若PE⊥AC,则点P的运动轨迹长度为√2

三、填空题:本题共3小题,每小题5分,共15分。

12. 已知函数f(x)=2lnx-(a/x)的图象在x=1处的切线与直线x-4y-2=0垂直,则a=______

13. 已知某圆锥的母线长为4,其侧面展开图是一个半圆,则该圆锥的体积为______

14. 已知椭圆C1:x²/a²+y²/b²=1和双曲线C2:x²/a²-y²/b²=1(a>0,b>0)有公共焦点F1,F2 (F1为左焦点),C1与C2在第三象限交于点M,直线MF1交y轴于点N,且F2N平分∠MF1F2,则C2的离心率为______

四、解答题:本题共5小题,共77分。解答应写出文字说明、证明过程或演算步骤。

15. (13分) 数列{an}的前n项和Sn=n(n+1),数列{bn}满足b1b2...bn=2n(n+1)/2 (n∈N*)。
(1) 求数列{an},{bn}的通项公式;
(2) 将数列{an}和数列{(-1)nbn}各取前100项,按从小到大排成一个新的数列{dn},其中重复的数只取一次,求数列{dn}的前100项和。

16. (15分) 随着人工智能的快速发展,它在社会生活中的应用将越来越广泛。某AI科技公司发明了一套人机交互软件,对用户输入的问题它会从数据库中自动检索并生成答案进行应答。大量试验统计表明,如果输入的问题没有语法错误,则软件生成正确答案的概率为85%;若出现语法错误,则软件生成正确答案的概率为35%。已知用户每次输入的问题没有语法错误的概率为90%,且对于每次输入的问题软件生成正确答案相互独立。
(1) 求用户输入一个问题软件生成正确答案的概率;
(2) 在某次试验中,用户输入n(n>8)个问题,记其中软件生成正确答案的个数为X,事件X=k (k=0,1,2,...,n)的概率为P(X=k)。当n取何值时,P(X=8)的值最大?

17. (15分) 如图,在棱长为6√2的正四面体A-BCD中,E为棱BC的中点。
(1) 证明:BC⊥平面AED;
(2) 记O为正四面体A-BCD内切球的球心。
(i) 求内切球O的半径r;(写出推导过程,直接写结果不给分)
(ii) 设P是球O的球面上一点,且OP⊥平面BCD,当∠ADP最小时,求二面角A-PD-B的正弦值。

18. (17分) 已知平面直角坐标系xOy上一动点Q满足|QE|-|QF|=2√2,E(-3,0),F(3,0)。
(1) 求点Q的轨迹曲线C的方程;
(2) 斜率为-1的直线与曲线C交于A,B两点且点P(2,1)。
(i) 求直线AP,BP的斜率之和;
(ii) △PAB的外接圆圆心M是否在某定直线上?说明理由。

19. (17分) 已知函数f(x)=(x-a)ex-bx²+a,其中a和b都是实数。
(1) 当b=0时,若f(x)的图象与x轴相切,求a的值;
(2) 当a=1时,若f(x)在(0,+∞)有一个零点,求b的取值范围;
(3) 设数列{xn}满足x1=1,xn+1=1-1/(xn+1),证明:2/(x1+2)+2/(x2+2)+...+2/(xn+2) < 1。

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  1. CONNECT:[ UseTime:0.000458s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000672s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001140s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003402s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000610s ]
  6. SELECT * FROM `set` [ RunTime:0.004908s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000622s ]
  8. SELECT * FROM `article` WHERE `id` = 464156 LIMIT 1 [ RunTime:0.013387s ]
  9. UPDATE `article` SET `lasttime` = 1773375690 WHERE `id` = 464156 [ RunTime:0.024181s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005721s ]
  11. SELECT * FROM `article` WHERE `id` < 464156 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.022160s ]
  12. SELECT * FROM `article` WHERE `id` > 464156 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.016597s ]
  13. SELECT * FROM `article` WHERE `id` < 464156 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.036932s ]
  14. SELECT * FROM `article` WHERE `id` < 464156 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.019499s ]
  15. SELECT * FROM `article` WHERE `id` < 464156 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.027898s ]
0.265190s