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2026年深圳初三模拟卷

  • 2026-04-16 04:36:01
2026年深圳初三模拟卷

2026年深圳市中考数学模拟试卷(3)

           姓名班级:

一.选择题(共8小题)

1.下列运算正确的是(  )

A.2a•6a=12aB.

C.(3c3=3c3D.

2.中芯国际在2025年春季宣布成功研制出全球首个2nm芯片,已知1nm为0.000000001米,2nm用科学记数法表示为(  )米.

A.2×10﹣9B.20×10﹣9C.0.2×10﹣9D.2×10﹣10

3.计算的结果等于(  )

A.B.C.D.

4.通过实验发现,凸透镜能使与主光轴平行的光线聚在主光轴上一点.如图,箭头所画的是光线的方向,点F,F′是凸透镜的焦点,BDCEFF若∠BDF=148°,∠CEF=160°,则∠DFE的度数为(  )

A.10°B.12°C.20°D.32°

5.意4个实数a,b,c,d定义一种新的运算:.例如:.则关于x的方程的根的情况为(  )

A.有两个不相等的实数根

B.有两个相等的实数根

C.没有实数根

D.无法确定

6.如图,小明从点A出发前进15m到达A1,然后向右转20°;再前进15m到达A2,然后又向右转20°⋯⋯,一直这样走下去,他第一次回到出发点A时,一共走了(  )

A.270mB.285mC.300mD.360m

7.如图,在△ABC中,AC=4,BC=3,AB=5,点D是边AB上一动点(不与AB重合),沿着AB运动,过点DDEBCAC于点E,作DFACBC于点F,设EF2y,AD的长为x,能反映yx之间函数关系的图象是(  )

A.                           B.

C.D.

8.如图,四边形ABCD中,∠BAC=∠CDB=90°,对角线AC,BD交于点E,若ABAC,AE=2EC,且CD=1,则AB的长为(  )

A.B.2C.D.

二.填空题(共5小题)

9.分解因式:2a﹣6ab .

10.在Rt△ABC中,∠C=90°,cosA,则sinB .

11.如图ABO的直径,OC垂直弦AD于点C,CO的延长线交O于点E,连接BE,若AB=10,AD=8,则BE的长为  .

12.在边长为1的正方形ABCD中,连接CE,将△CBE沿CE折叠得到△CGE,CGBD于点M,延长CGAD于点F,则点GAB的距离是 .

13.如图,在平面直角坐标系中,矩形OABC的顶点A,C分别在x轴的负半轴,y轴的正半轴上,点B在第二象限.将矩形OABC绕点O顺时针旋转,使点B落在y轴上,得到矩形OA'B'C',BCOA′相交于点M.若经过点M的反比例函数的图象交AB于点N,矩形OABC的面积为8,,则BN的长为 .

三.解答题(共7小题)

14.先化简,再求值:,其中

15.某科技公司科研团队研发了三款智能机器人,分别命名为ABC为测试这三款机器人在图象识别能力和运动能力方面的综合表现,团队对它们进行了全面测试.在图象识别能力测试中,ABC三款机器人的得分分别为90分、85分、83分.运动能力测试由10位专业测试员打分,每位测试员最高打10分,各位测试员打分之和为运动能力测试成绩.现需对三款机器人的运动能力测试数据进行详细分析.

ABC三款机器人运动能力测试情况统计表

机器人

测试员打分的

中位数

运动能力测试成绩

方差

A

m

85

1.85

B

8.5

87

0.61

C

8

n

2.01

任务1:m ,n ;

数据分析与运用

任务2:按图象识别能力测试成绩占30%,运动能力测试成绩占70%计算综合成绩,请你判断ABC三款机器人中综合成绩最高的是哪一款?并说明理由;

任务3:综合以上情况,如果要选择ABC三款机器人中的一款上台表演,你会选择哪一款?并说明理由.

16.随着新能源汽车使用的日益普及,各个小区都纷纷完善新能源汽车的配套设施,其中新能源充电桩的建设成为重点工作,某小区也不例外,计划购置单枪、双枪两款新能源充电桩,来满足小区内新能源汽车车主日益增长的充电需求,然而,在购置过程中,面临着不同的价格、数量以及预算限制等问题,就像下面所描述的情况一样.某小区计划购置如图所示的单枪、双枪两款新能源充电桩,购置充电桩的相关信息如表:

单枪充电桩

双枪充电桩

花费:50000元

花费:45000元

单价:x元/个

单价:1.5x元/个

(1)若本次购买单枪充电桩的数量比双枪充电桩的数量多20个,求单枪、双枪两款新能源充电桩的单价;

(2)在(1)的条件下,根据居民需求,小区决定再次购进单枪、双枪两款新能源充电桩共20个,已知单枪新能源充电桩的单价比上次购买时提高了10%,双枪新能源充电桩的单价比上次购买时降低了10%,如果此次加购小区预备支出不超过25000元,求小区最少需要购买单枪新能源充电桩的数量.

17.如图,已知△ABC

(1)在图1中用无刻度的直尺和圆规在BC上找一点D使得∠ADC=2∠ABC,再作出△ABD的内切圆的圆心O(不写作法,保留作图痕迹).

(2)在(1)条件下,若AB=16,,则O的半径为 .

18.如图,熏笼是放在炭盆上的竹罩笼,是古代一种烘烤和取暖的用具.将熏笼开口朝下放在水平桌面上,其截面为抛物线形,如图2,测得熏笼的跨度为80厘米,高度为32厘米,小明以熏笼的左边缘为原点,水平线为x轴建立平面直角坐标系.

   (1)求抛物线的表达式;

   (2)现有一批长8厘米,高6厘米的熏炉套盒要放进熏笼内一起运输,当把熏炉套盒完全放在正中间进行叠放时,这一列最多能叠放几个套盒?

19.数学以极度浓缩的语言写出了物理世界的基本结构,唯有数学才能以最终的、精确的和便于讲授的形式表达自然规律,唯有数学才能应用于错综复杂的物质运动过程之中.某班同学在进行数学和物理跨学科项目式学习时,深入探究了电子托盘秤的工作原理.

  【阅读素材】

    素材1:图1为某款电子托盘秤,图2为其对应的电路图,电源两端的电压保持不变,通过所称物体质量调节可变电阻R1的大小,从而改变电路中的电流I,最终通过显示器显示所称物体质量.电流I(单位:mA)与总电阻R(单位:kΩ)成反比例,其中RR1+R2,已知R2=10kΩ

   素材2:可变电阻R1(单位:kΩ)与物体质量x(单位:kg)之间的关系如图3所示(R1≥0),当放置物体质量为2.2kg时,电流表显示为0.3mA

   【问题解决】根据【阅读材料】中的素材1和素材2完成下列问题.

   (1)当放置物体质量为2.2kg时,求此时可变电阻R1的值;

   (2)求电流I关于可变电阻R1的函数表达式;

   (3)为保证电子托盘秤的电路安全,现将电流范围设定为0.15≤I≤0.5(单位:mA),求该电子托盘秤所称物体质量的最大值.

20.在矩形ABCD中,M为直线AB上的点(不与点B重合),连接CM,将线段CM绕点C逆时针旋转90°得到线段CN,点P为线段BM上一点,连接DNCP,CPDN相交于点H

(1)如图1,若CDCM,CP平分∠BCM,求证:△CDH∽△PCB

(2)如图2,若ABAD,点M与点A重合,PBM的中点,则的值是 CPDN的位置关系是 

(3)如图3,若CD=4,BC=3,BMBC,且,探究CPDN的位置和数量关系,并说明理由.

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  1. CONNECT:[ UseTime:0.000916s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001264s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000678s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000635s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001095s ]
  6. SELECT * FROM `set` [ RunTime:0.000461s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001255s ]
  8. SELECT * FROM `article` WHERE `id` = 542690 LIMIT 1 [ RunTime:0.005552s ]
  9. UPDATE `article` SET `lasttime` = 1776503078 WHERE `id` = 542690 [ RunTime:0.011600s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001932s ]
  11. SELECT * FROM `article` WHERE `id` < 542690 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001009s ]
  12. SELECT * FROM `article` WHERE `id` > 542690 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001379s ]
  13. SELECT * FROM `article` WHERE `id` < 542690 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003465s ]
  14. SELECT * FROM `article` WHERE `id` < 542690 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001388s ]
  15. SELECT * FROM `article` WHERE `id` < 542690 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001435s ]
0.207987s