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【免费下载】精编天津市静海模范中学20232024学年九年级上学期月考数学试题

  • 2026-01-13 13:53:02
【免费下载】精编天津市静海模范中学20232024学年九年级上学期月考数学试题

2023—2024学年度第一学期阶段测试九年级数学

一、

二、择题(每小题336分)

1. 下列方程中,是一元二次方程的有(  )

①8x2+x=20;②2x2﹣3xy+4=0;③x2=4;④x2=0;⑤x2﹣3x﹣4=0

A. 2B. 3C. 4D. 5

2. 一元二次方程xx2)=2x的根是(  )

A. 1B. 0

C. 12D. 12

3. 关于的一元二次方程有两个不相等的实数根,则的取值范围是(

A. B. C. D. 

4. 某机械厂七月份生产零件50万个,九月份生产零件72万个.设该厂八九月份平均每月增长率为x,那么x满足的方程是(  )

A500(1+x)2=72B. 50(1+x)=72

C. 50(1+x)2=72D. 50(1+2x)=72

5. 对于二次函数y=﹣2x2,下列结论正确的是(

A. yx的增大而增大B. 图象关于直线x0对称

C. 图象开口向上D. 无论x取何值,y的值总是负数

6. 对于抛物线,下列说法错误的是(

A. 开口方向相同

B. 对称轴相同

C. 抛物线是由抛物线向上平移1个单位长度得到的

D. 顶点的坐标相同

7. 对于二次函数y=3(x-1)2,下列结论正确的是()

A. x取任何实数时,y的值总是正的B. 其图象的顶点坐标为(0,1)

C. x>1,yx的增大而增大D. 其图象关于x轴对称

8. 抛物线上有三点大小关系是(

AB. C. D. 

9. 将抛物线y=﹣5x2+1向左平移1个单位长度,再向下平移2个单位长度,所得到的抛物线为(  )

A. y=﹣5(x+1)2﹣1B. y=﹣5(x﹣1)2﹣1C. y=﹣5(x+1)2+3D. y=﹣5(x﹣1)2+3

10. 在同一坐标系内,函数的图象大致为(  )

A. B. C. D. 

11. 下列说法错误的是(  )

A. 二次函数中,当时,yx的增大而增大B. 二次函数中,当时,y有最大值0

C. a越大图像开口越小,a越小图像开口越大D. 不论a是正数还是负数,抛物线)的顶点一定是坐标原点

12. 二次函数y=x2+1的图象与x轴交于AB两点,与y轴交于点C,下列说法错误的是(  ).

A. C的坐标是(0,1B. 线段AB的长为2

C. ABC是等腰直角三角形D. x0时,yx增大而增大

二、填空题(每小题3分,共18分)

13. 已知点在抛物线,则当时,y的值为___________

14. 方程的两根为,则____________

15. 已知函数是关于x的二次函数,则m的值为________

16. 某摄影小组互送相片作纪念,全组共送出相片132张,该摄影小组有____________人.

17. 若关于x的一元二次方程的两个根为3,,则二次三项式可分解为______

18. 某超市销售一种饮料,平均每天可售出100箱,每箱利润20元.为扩大销售,超市准备适当降价.据测算,每箱每降价4元,平均每天可多售出20箱.若要使每天销售这种饮料获利1280元,每箱应降价多少元?设每箱降价x元,可列方程___

三、解答题

19. 按要求解下列方程

(1)(公式法);

(2)(配方法).

(3)

(4)

20. 已知关于x的方程x2-2(k-3)x+k2-4k-1=0.

(1)若这个方程有实数根,求k取值范围; 

(2)若这个方程有一个根为1,求k的值;

21. 如图,有长为30米的篱笆,一面利用墙(墙的最大可用长度为10米),围成中间隔有一道篱笆(平行于)的矩形花圃,设花圃一边的长为x米,面积为y平方米.

(1)yx的函数关系式;

(2)如果要围成面积为63平方米的花圃,的长是多少?

22. 已知抛物线经过点.

1)求这个函数的解析式;

2)写出抛物线上点关于轴的对称点的坐标;

3)求的面积;

4)抛物线上是否存在点,使的面积等于面积的一半?若存在,求出点的坐标;若不存在,请说明理由.

23. 中,,点P从点A开始沿边向终点B1cm/s的速度移动,与此同时,点Q从点B开始沿边向终点C2cm/s的速度移动.如果点PQ分别从点AB同时出发,当点Q运动到点C时,两点停止运动.设运动时间为t秒.

(1)填空:________,________(用含t的代数式表示);

(2)是否存在t的值,使得的面积等于?若存在,请求出此时t的值;若不存在,请说明理由.

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  122. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-orm/src/db/concern/TableFieldInfo.php ( 2.63 KB )
  123. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-orm/src/db/concern/Transaction.php ( 2.77 KB )
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  1. CONNECT:[ UseTime:0.000678s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000664s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007062s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005324s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000577s ]
  6. SELECT * FROM `set` [ RunTime:0.000183s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000559s ]
  8. SELECT * FROM `article` WHERE `id` = 460844 LIMIT 1 [ RunTime:0.015620s ]
  9. UPDATE `article` SET `lasttime` = 1768298042 WHERE `id` = 460844 [ RunTime:0.006595s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 460844 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004483s ]
  12. SELECT * FROM `article` WHERE `id` > 460844 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000381s ]
  13. SELECT * FROM `article` WHERE `id` < 460844 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000714s ]
  14. SELECT * FROM `article` WHERE `id` < 460844 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000657s ]
  15. SELECT * FROM `article` WHERE `id` < 460844 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002777s ]
0.123377s