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【免费下载】精编天津市津南区南部学区20222023学年八年级下学期期中数学试题

  • 2026-01-16 20:31:39
【免费下载】精编天津市津南区南部学区20222023学年八年级下学期期中数学试题

学年天津市津南区南部学区八年级下数学

一.选择题

二.(本大题共12小题,每小题3分,共36分)

1. 若代数式在实数范围内有意义,则x的取值范围是(

A. B. C. D. 

2. 下列运算,结果正确的是(

A. B. C. D. 

3. 关于▱ABCD的叙述,正确的是(  )

A. ACBD,则ABCD菱形

B. ABAD,则ABCD是矩形

C. ABBC,则ABCD正方形

D. ACBD,则ABCD是菱形

4. 如图,在ABCD中,下列结论不一定成立的是()

A. 1=∠2B. ADDCC. ADC=∠CBAD. OAOC

5一本笔记本5元,买x本共付y元,则5y分别是(  )

A. 常量,常量B. 变量,变量C. 常量,变量D. 变量,常量

6. 如图,点E是正方形ABCD内一点,.若,则正方形ABCD的面积为(

A. 10B. 13C. 36D. 169

7. 如图是甲、乙两车在某时段速度随时间变化的图象,下列结论错误的是

A. 乙前4秒行驶的路程为48

B. 08秒内甲的速度每秒增加4/

C. 两车到第3秒时行驶的路程相等

D. 48秒内甲的速度都大于乙的速度

8. ABC中,∠C=90°,∠A=30°,AB=12,则BC= ()

A. 6B. 6C. 6D. 12

9. 如图,以数轴的单位长度线段为边作个正方形,以表示1的点圆心,正方形对角线长为半径画弧.交数轴于点A,则点A表示的数是(

A. 1B. 1C. 1D. 

10. 如图,有一个绳索拉直的木马秋千,绳索AB的长度为5米,若将它往水平方向向前推进3米(即米),且绳索保持拉直的状态,则此时木马上升的高度为(

A. 1B. C. 3D. 4

11. 如图,在△ABC中,点D,E分别是边AB,AC的中点,点F是线段DE上的一点连接AF,BF,∠AFB =90°,且AB=8,BC= 14,则EF的长是

A. 2B. 3C. 4D. 5

12. 矩形ABCDCEFG,如图放置,点B,C,E共线,点C,D,G共线,连接AF,取AF的中点H,连接GH.若BC=EF=2,CD=CE=1,则GH=(  )

A. 1B. C. D. 

二.填空题(本大题共6小题,每小题3分,共18分)

13. 计算的结果是______

14. 如图,在中,若,则_______°.

15. 中,,两直角边分别是ab,斜边是c,若,则_______

16. 对于函数,当时,________

17. 如图,点是矩形的对角线的中点,于点,若,则的长为____

18. 如图,已知正方形ABCD的边长为5,点EF分别在ADDC上,AE=DF=2,BEAF相交于点G,点HBF的中点,连接GH,则GH的长为_______

三.计算题(本大题共1小题,共12分)

19. 计算:

(1)

(2)

(3)

(4)

四.解答题(本大题共6小题,共54分)

20. 在如图所示的平面直角坐标系中,画出函数的图象.

(1)列表:

x

...

0

1

2

...

y

...

...

(2)描点并连线.

21. 如图反映的过程是小明从家去菜地浇水,又去玉米地锄草,然后回家.其中x表示时间,表示小明离他

通过网盘分享的文件:【免费下载】精编天津市津南区南部学区20222023学年八年级下学期期中数学试题

链接: https://pan.baidu.com/s/1EshOQdtXkF7qWV-gpdZXsA?pwd=4321 提取码: 4321 

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  127. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/event/LogRecord.php ( 1.02 KB )
  128. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-helper/src/Collection.php ( 16.47 KB )
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  130. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/View.php ( 4.39 KB )
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  132. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/response/View.php ( 3.29 KB )
  133. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  134. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
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  138. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
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  1. CONNECT:[ UseTime:0.000405s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000545s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002908s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000338s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000585s ]
  6. SELECT * FROM `set` [ RunTime:0.001380s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000597s ]
  8. SELECT * FROM `article` WHERE `id` = 461504 LIMIT 1 [ RunTime:0.004061s ]
  9. UPDATE `article` SET `lasttime` = 1768578748 WHERE `id` = 461504 [ RunTime:0.012690s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003561s ]
  11. SELECT * FROM `article` WHERE `id` < 461504 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000590s ]
  12. SELECT * FROM `article` WHERE `id` > 461504 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001805s ]
  13. SELECT * FROM `article` WHERE `id` < 461504 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018492s ]
  14. SELECT * FROM `article` WHERE `id` < 461504 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.062983s ]
  15. SELECT * FROM `article` WHERE `id` < 461504 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.023117s ]
0.206599s