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【免费下载】精编浙江省金华市东阳市江北初级中学等4校20222023学年九年级上学期12月月考数学试题

  • 2026-02-03 22:17:34
【免费下载】精编浙江省金华市东阳市江北初级中学等4校20222023学年九年级上学期12月月考数学试题

n

年下学期九年级数学练习(二)

试题卷

本卷考试范围:浙教版九上全册

考生须知:

1.全卷共三大题,24小题,满分为120分。考试时问为120分钟。

2.本卷答案必须填写在答题纸的相应位置上,写在试题卷、草稿纸上均无效。

3.答题前,认真阅读答题纸上的《注意事项》,按规定答题。

温馨提示:请仔细审题,细心答题,相信你一定会有出色的表现!

一、选择题(本题有10小题,每小题3分,共30分)

1. 已知,则的值是(  )

A. B. 5C. D. 

2. 箱子内有分别标示号码15的球,每个号码各2颗,总共10颗.已知小茹先从箱内抽出5颗球且不将球放回箱内,这5颗球的号码分别是12235.今阿纯打算从此箱内剩下的球中抽出1颗球,若箱内剩下的每颗球被他抽出的机会相等,则他抽出的球的号码,与小茹已抽出的5颗球中任意一颗球的号码相同的概率是多少?(

A. B. C. D. 

3. 如图:,那么的长为(

A. 4B. 12C. D. 6

4. 国旗法规定:所有国旗均为相似矩形,在下列四面国旗中,其中只有一面不符合标准,这面国旗是(

A. B. 

C. D. 

5. 已知是它们的对应高线,若,则的面积比是(

A. B. C. D. 

6. 向空中发射一枚炮弹,经x秒后的高度为y米,且时间与高度的关系为、若此炮弹在第8秒与第16秒时的高度相等,则在下列时间中炮弹所在高度最高的是(  )

A. 8B. 10C. 12D. 15

7. 由所有到已知点O的距离大于或等于1,并且小于或等于2的点组成的图形的面积为(

A. πB. C. D. 

8. 如图,中,于点,下列结论中错误的是( )

A. AC2=ADABB. CD2=CACB

C. CD2=ADDBD. BC2=BDBA

9. 如图,在扇形中,D为弧上的点,连接并延长与的延长线交于点C,若,则的度数为(  )

A. B. C. D. 

10. 已知二次函数的对称轴为直线,与x轴的一个交点B的坐标为其图象如图所示,下列结论:①③一元二次方程的两个根是1;④当时,;⑤当时,yx的增大而增大;⑥若点是函数图象上的三点,则,其中正确的有(  )个

A. 5B. 4C. 3D. 2

二、填空题(本题有6小题,每小题4分,共24分)

11. 若线段,且点C的黄金分割点,且,则的长为____________.

12. 如图,在的长方形网格飞镖游戏板中,每块小正方形除颜色外都相同,小正方形的顶点称为格点,扇形的圆心及弧的两端均为格点.假设飞镖击中每一块小正方形是等可能的(击中扇形的边界或没有击中游戏板,则重投1次),任意投掷飞镖1次,飞镖击中扇形(阴影部分)的概率是______

13. 若将抛物线所在平面直角坐标系中的x轴向上平移1个单位,把y轴向右平移2个单位,则该抛物线在新的平面直角坐标系下的函数表达式为_____

14. 如图,已知点F上,且,点D延长线上一点,,连接交于点N,则__________

15. 如图,量角器的直径与直角三角板ABC的斜边重合(),其中量角器0刻度线的端点N与点A重合,射线处出发沿顺时针方向以每秒3度的速度旋转,与量角器的半圆弧交于点E,第20秒时点E在量角器上运动路径长是_____

16. 如图,已知抛物线x轴的相交于A,B两点(AB的右侧),与y轴的相交于点C,点P,Q分别从A,O两点同时以秒的速度沿B,C方向移动,用t(秒)表示移动时间,连接,当t_____值时,以O,P,Q为顶点的三角形与相似.

三、解答题(本题有8小题,共66分,各小题都必须写出解答过程)

17. 如图是某数学兴趣小组设计用手电筒来测量某古城墙高度示意图,在点P处放一水平的平面镜,光线从点A出发经平面镜反射后刚好射到古城墙的顶端C处,,且测得,求该古城墙的高度是多少m

18. 在一个不透明的口袋里装有若干个相同的红球,为了估计袋中红球的数量,九(1)班学生在数学实验室分组做摸球试验:每组先将15个与红球大小形状完全相同的白球装入袋中,搅匀后从中随机摸出一个球并记下颜色,再把它放回袋中,不断重复.下表是这次活动统计汇总各小组数据后获得的全班数据统计表:

摸球次数s

150

300

600

900

1200

1500

摸到红球的频数n

123

243

487

725

964

1200

摸到红球的频率

0.820

0.810

0.812

0.806

0.803

a

(1)

(2)请估计:当次数s很大时,摸到红球的频率将会接近(精确到0.01);请推测:摸到红球的概率是(精确到0.1).

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  1. CONNECT:[ UseTime:0.000705s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001067s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002227s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003026s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000840s ]
  6. SELECT * FROM `set` [ RunTime:0.003857s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001004s ]
  8. SELECT * FROM `article` WHERE `id` = 464988 LIMIT 1 [ RunTime:0.007079s ]
  9. UPDATE `article` SET `lasttime` = 1770276804 WHERE `id` = 464988 [ RunTime:0.023291s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.009792s ]
  11. SELECT * FROM `article` WHERE `id` < 464988 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002073s ]
  12. SELECT * FROM `article` WHERE `id` > 464988 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002191s ]
  13. SELECT * FROM `article` WHERE `id` < 464988 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.040485s ]
  14. SELECT * FROM `article` WHERE `id` < 464988 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001027s ]
  15. SELECT * FROM `article` WHERE `id` < 464988 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008052s ]
0.242968s