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湖南省长沙市教科院中考数学模拟试卷(四)

  • 2026-03-21 14:46:27
湖南省长沙市教科院中考数学模拟试卷(四)
湖南省长沙市教科院中考数学模拟试卷(四)
一、选择题(在下列各题的四个选项中,只有一项是符合题意的.请在答题卡中填涂符合题意的选项.本大题共10个小题,每小题3分,共30分)
1.国家之魂,文以化之,文以铸之.习近平总书记曾在多个场合明确坚定文化自信的重要性,强调“有文化自信的民族,才能立得住、站得稳、行得远”.下列甲骨文中,可看作轴对称图形的是(  )
A、B、
C、D、

2.5G技术作为第五代移动通信技术,不仅显著提升了数据传输速度和网络容量,还为各行各业的数字化转型提供了强有力的支持.研究显示,5G将带来2200万个就业机会.数据2200万用科学记数法表示为(  )
A、22×104B、2.2×103
C、2.2×107D、0.22×108

3.若a>b,则下列各式中一定成立的是(  )
A、3a<3bB、−5a>−5b
C、2−a<2−bD、a−1<b−1

4.下列调查活动中,适合采用普查的是(  )
A、对长沙市中学生身高的调查
B、对国庆黄金周来湖南旅游的人数的调查
C、对参加第一届全国青少年三大球运动会闭幕式的观众人数的调查
D、对湖南省喜欢吃臭豆腐的人数的调查

5.如图是某几何体的展开图,该几何体是(  )
A、圆柱B、长方体
C、圆锥D、三棱柱

6.将一个直角三角板按如图方式放置在一个无刻度的直尺上,可知∠1=115°,则∠2的度数为(  )
A、155°B、145°
C、135°D、120°

7.数学课上,同学们用△ABC纸片进行折纸操作.按照下列各图所示的折叠过程,线段AD是△ABC中线的是(  )
A、
B、
C、
D、

8.问题“解方程x2+2x+4=0”,小艾说“其中一个解是x=−1”,小贝说“b2−4ac<0,此方程无实数根”,小司说“方程有两个实数根,这两个实数根的和为−2”,判断下列结论正确的是(  )
A、小艾说得对B、小贝说得对
C、小司说得对D、三名同学说法都不对

9.菱形ABCD的对角线AC,BD相交于点O,分别以点B,C为圆心、大于
1
2
BC
长为半径作弧,两弧分别交于点M,N,作直线MN交BC于点E,连接OE.若∠ABC=60°,AC=6,则OE的长为(  )
A、
3
B、3
C、3
3
D、6

10.如图,BC是⊙O的直径,弦AC=8,tan∠ACB
3
,D是下半圆
BC
上一个动点,E为AD的中点,连接BE,则BE的最小值为(  )
A、8
3
−4
B、4
3
C、4D、4
7
−4

二、填空题(本大题共6个小题,每小题3分,共18分)
11.分解因式:xy2−x=.

12.在函数y
1−x
x+2
中,自变量x的取值范围是.

13.长沙市九年级男生体育中考中技能类测试项目是“篮球运球、足球运球、排球向上垫球、200米游泳”,学生自选其中一项测试,则甲、乙两名男生选择同一个测试项目的概率是.

14.已知一个菱形的两条对角线的长分别为10和24,则这个菱形的周长为.

15.如图,AB是⊙O的直径,⊙O的半径为3,∠ADC=30°,则
BC
的长为.

16.如图,在平面直角坐标系中,直线y1=ax+b(a≠0)与双曲线y2
k
x
(k≠0)
交于点A(−3,1),B(m,−2),则满足y1<y2的x的取值范围是.

三、解答题(本大题共9个小题,第17、18、19题每小题6分,第20、21题每小题6分,第22、23题每小题6分,第24、25题每小题6分,共72分.解答应写出必要的文字说明、证明过程或演算步骤)
19.实验是培养学生的创新能力的重要途径之一.如图1是张同学安装的化学实验装置,图2是示意图,安装要求为试管略向下倾斜,试管夹应固定在距试管口的三分之一处.已知试管长AB=30cm,BE
1
3
AB
,试管倾斜角α为15°,试管夹的高度DE=22.6cm.(参考数据:sin15°≈0.26,cos15°≈0.97,tan15°≈0.27)
(1)求试管底端的高度AC;
(2)实验时,当导气管紧贴水槽MN,延长BM交CN的延长线于点F,且MN⊥CF(点C,D,N,F在一条直线上),经测得:DN=19.7cm,∠ABM=150°,求线段MN的长度.

20.为了解某校学生的课余兴趣爱好情况,某调查小组设计了“文学欣赏”“球类运动”“动漫制作”和“其他”四个选项,用随机抽样的方法调查了该校部分学生的课余兴趣爱好情况(每个学生必须选一项且只能选一项),并根据调查结果绘制了如图两幅不完整的统计图.

根据图表中提供的信息,解答下列问题:
(1)求m的值,并补全条形统计图;
(2)在扇形统计图中,“动漫制作”选项所对应的扇形圆心角的大小为多少?
(3)若该校共有3000名学生,请根据统计结果估计该校课余兴趣爱好为“球类运动”的学生人数.

21.如图,在▱ABCD中,BE⊥AC于点E,DF⊥AC于点F.
(1)求证:AF=CE;
(2)若CE=2
3
CF
3
,∠DAE=30°,求CD的长.

22.张女士计划购买一辆新车,看中了价格相同的两款国产车.
燃油车油箱容积:40升油价:8.4元/升续航里程:a千米每千米行驶费用:
336
a
新能源车电池容量:60千瓦时电价:0.6元/千瓦时续航里程:a千米每千米行驶费用:元
(1)用含a的代数式表示新能源车的每千米行驶费用为元;
(2)已知燃油车的每千米行驶费用比新能源车多0.5元.
①分别求出这两款车的每千米行驶费用;
②若燃油车和新能源车每年的其他费用分别为4800元和7000元.问:每年行驶里程为多少千米时,买新能源车的年费用更低?(年费用=年行驶费用+年其他费用)

23.如图,在Rt△ABC中,∠ACB=90°,点E是边AB上一点,以BE为直径的半圆O交AC于点D,连接ED并延长,交BC的延长线于点F,且BF=BE,连接BD.
(1)求证:AC是⊙O的切线;
(2)若∠A=30°,BC=9,求阴影部分的面积.

25.在菱形ABCD中,BD是对角线,点M是线段BD上的一个动点,过A,B,M三点作⊙O.已知菱形的边长为
10
,且tan∠DBC
1
3

(1)如图1,若M是BD中点,求AM的长;
(2)如图2,延长AM交直线BC于点N.若射线DA经过点O,与⊙O的另一交点为E,连接EM,求
AM
MN
的值;
(3)如图3,若⊙O的半径的平方为y,BM=x.当0<x<3时,请直接写出y与x的函数解析式.

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  1. CONNECT:[ UseTime:0.000778s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001117s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000474s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000477s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000899s ]
  6. SELECT * FROM `set` [ RunTime:0.000388s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001214s ]
  8. SELECT * FROM `article` WHERE `id` = 467522 LIMIT 1 [ RunTime:0.000821s ]
  9. UPDATE `article` SET `lasttime` = 1774081910 WHERE `id` = 467522 [ RunTime:0.009443s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003433s ]
  11. SELECT * FROM `article` WHERE `id` < 467522 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000760s ]
  12. SELECT * FROM `article` WHERE `id` > 467522 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001348s ]
  13. SELECT * FROM `article` WHERE `id` < 467522 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002736s ]
  14. SELECT * FROM `article` WHERE `id` < 467522 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001874s ]
  15. SELECT * FROM `article` WHERE `id` < 467522 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003704s ]
0.153927s