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【2020年重庆市中考数学试卷(B卷)及答案中考真题电子版word版PDF版免费下载

  • 2026-04-03 04:02:48
【2020年重庆市中考数学试卷(B卷)及答案中考真题电子版word版PDF版免费下载

一.选择题(共12小题)

1.5的倒数是(  )

A.5B.C.﹣5D.﹣

2.围成下列立体图形的各个面中,每个面都是平的是(  )

A.长方体B.圆柱体

C.球体D.圆锥体

3.计算aa2结果正确的是(  )

A.aB.a2C.a3D.a4

4.如图,ABO的切线,A为切点,连接OA,OB.若∠B=35°,则∠AOB的度数为(  )

A.65°B.55°C.45°D.35°

5.已知a+b=4,则代数式1++的值为(  )

A.3B.1C.0D.﹣1

6.如图,△ABC与△DEF位似,点O为位似中心.已知OAOD=1:2,则△ABC与△DEF的面积比为(  )

A.1:2B.1:3C.1:4D.1:5

7.小明准备用40元钱购买作业本和签字笔.已知每个作业本6元,每支签字笔2.2元,小明买了7支签字笔,他最多还可以买的作业本个数为(  )

A.5B.4C.3D.2

8.下列图形都是由同样大小的实心圆点按一定规律组成的,其中第个图形一共有5个实心圆点,第个图形一共有8个实心圆点,第个图形一共有11个实心圆点,…,按此规律排列下去,第个图形中实心圆点的个数为(  )

A.18B.19C.20D.21

9.如图,垂直于水平面的5G信号塔AB建在垂直于水平面的悬崖边B点处,某测量员从山脚C点出发沿水平方向前行78米到D点(点A,B,C在同一直线上),再沿斜坡DE方向前行78米到E点(点A,B,C,D,E在同一平面内),在点E处测得5G信号塔顶端A的仰角为43°,悬崖BC的高为144.5米,斜坡DE的坡度(或坡比)i=1:2.4,则信号塔AB的高度约为(  )

(参考数据:sin43°≈0.68,cos43°≈0.73,tan43°≈0.93)

A.23米B.24米C.24.5米D.25米

10.若关于x的一元一次不等式组的解集为x≥5,且关于y的分式方程+=﹣1有非负整数解,则符合条件的所有整数a的和为(  )

A.﹣1B.﹣2C.﹣3D.0

11.如图,在△ABC中,AC=2,∠ABC=45°,∠BAC=15°,将△ACB沿直线AC翻折至△ABC所在的平面内,得△ACD.过点AAE,使∠DAE=∠DAC,与CD的延长线交于点E,连接BE,则线段BE的长为(  )

A.B.3C.2D.4

12.如图,在平面直角坐标系中,矩形ABCD的顶点A,C分别在x轴,y轴的正半轴上,点D(﹣2,3),AD=5,若反比例函数y(k>0,x>0)的图象经过点B,则k的值为(  )

A.B.8C.10D.

二.填空题(共6小题)

13.计算:()﹣1

14.经过多年的精准扶贫,截至2019年底,我国的农村贫困人口减少了约94000000人.请把数94000000用科学记数法表示为

15.盒子里有3张形状、大小、质地完全相同的卡片,上面分别标着数字1,2,3,从中随机抽出1张后不放回,再随机抽出1张,则两次抽出的卡片上的数字之和为奇数的概率是

通过网盘分享的文件:重庆中考语文等7个文件

链接: https://pan.baidu.com/s/1IKVIjbU85uLQ8hQA8ofMqg?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000434s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000687s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008508s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000524s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000601s ]
  8. SELECT * FROM `article` WHERE `id` = 472020 LIMIT 1 [ RunTime:0.002983s ]
  9. UPDATE `article` SET `lasttime` = 1775193834 WHERE `id` = 472020 [ RunTime:0.009179s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001258s ]
  11. SELECT * FROM `article` WHERE `id` < 472020 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000458s ]
  12. SELECT * FROM `article` WHERE `id` > 472020 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000362s ]
  13. SELECT * FROM `article` WHERE `id` < 472020 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003454s ]
  14. SELECT * FROM `article` WHERE `id` < 472020 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004208s ]
  15. SELECT * FROM `article` WHERE `id` < 472020 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002344s ]
0.106729s