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【广东省广州市白云区2024-2025学年七年级上学期期末考试数学试卷

  • 2026-03-07 08:42:26
【广东省广州市白云区2024-2025学年七年级上学期期末考试数学试卷

一、选择题(本大题共10小题,每小题3分,满分30分.在每小题给出的四个选项中,只有一项是符合题目要求的.)

1.(3分)中国是最早采用正负数来表示相反意义的量的国家,如果上升50米,记作+50米,那么下降100米,记作(  )

A.﹣100米B.﹣10米C.﹣90米D.﹣1000米

2.(3分)计算(﹣2024)×(﹣1)的结果为(  )

A.2024B.﹣2024C.D.

3.(3分)化简整式﹣(x﹣3)的结果为(  )

A.x﹣3B.x+3C.﹣x﹣3D.﹣x+3

4.(3分)下列运用等式性质变形一定正确的是(  )

A.若ab,则acb+cB.若ab,则2a=3b

C.若ab,则acbcD.若acbc,则ab

5.(3分)如图,已知油用去一半时,桶和油的质量一共是akg.当再次装满油时,桶和油的质量一共是bkg,则桶的重量是(  )

A.2(abB.(2abC.(2baD.2(ba

6.(3分)下列图形中,不是正方体的展开图的为(  )

A.B.

C.D.

7.(3分)如图,则第n个图形中三角形的个数是(  )

A.2n+2B.4n+4C.4n﹣4D.4n

8.(3分)如图所示的是某月的月历,任意选取“工”型框中的7个数(如阴影部分所示),则这7个数的和可能是(  )

A.49B.60C.84D.105

9.(3分)《九章算术》是我国古代数学名著,卷七“盈不足”中有题译文如下:今有人合伙买羊,每人出5钱,会差45钱;每人出7钱,会差3钱.问合伙人数、羊价各是多少?甲、乙两人所列方程如下,下列判断正确的是(  )

甲:设人数为x人,可列方程5x+45=7x+3;

乙:设羊价为y元,可列方程为

A.只有甲对B.只有乙对C.甲、乙都对D.甲、乙都错

10.(3分)如图,已知O为直线AB上一点,过点O向直线AB上方引三条射线OCODOE,且OC平分∠AOD,∠BOE=3∠DOE,∠COE=70°,则∠BOE的度数为(  )

A.30°B.45°C.50°D.60°

二、填空题(本大题共6小题,每小题3分,满分18分.)

11.(3分)﹣2﹣|﹣3|=

12.(3分)体育课上全班女生进行了50米测试,达标成绩为10.6s,下面是某小组8名女生的成绩记录:﹣0.1,+0.8,0,﹣1.6,﹣0.8,﹣0.3,+1.5,﹣0.6,其中“+”号表示成绩大于10.6s,“0”号表示成绩等于10.6s,“﹣”号表示成绩小于10.6s,该小组达标的女生共有 人.

13.(3分)若﹣2axbxy与5a2b5是同类项,则x=  ,y= 

14.(3分)如果4x﹣20与的值互为相反数,则x= 

15.(3分)计算:32°19'+16°53'16''= 

16.(3分)如图,射线OD是∠BOC的平分线,射线OE是∠AOC的平分线,∠AOB:∠BOC=3:2.若∠BOE=13°,则∠DOE的度数为 

三、解答题(共有9小题,共72分,解答要求写出文字说明,证明过程或计算步骤)

17.(4分)计算:(﹣12)+13+(﹣18).

18.(4分)解方程:2(3﹣4x)=1﹣3(2x﹣1).

解:去括号,得6﹣4x=1﹣6x﹣1,(第一步)

移项及合并同类项,得2x=﹣6,(第二步)

系数化为1,得x=﹣3.(第三步)

以上解方程正确吗?若不正确,请指出错误的步骤,并给出正确的解答过程.

19.(6分)先化简,再求值:2(a2b+ab2)﹣2(a2b﹣1)﹣ab2﹣2.其中a=1,b=﹣3.

20.(6分)如图,已知点ABOM,请按下列要求作图并解答.

(1)连接AB

(2)画射线OM

(3)在射线OM上取点C,使得OC=2AB(尺规作图,保留作图痕迹);

21.(8分)如图所示,某长方形广场的四角都有一块半径相同的圆形的草地,已知圆形的半径为r米,长方形的长为a米,宽为b米.

(1)请列式表示广场空地的面积;

(2)若长方形的长为300米,宽为200米,圆形的半径为10米,计算广场空地的面积(计算结果保留π).

22.(10分)某校开展校园艺术节系列活动,派小明到文体超市购买若干个文具袋作为奖品.这种文具袋标价每个10元,请认真阅读结账时老板与小明的对话图片,解决下面两个问题:

(1)求小明原计划购买文具袋多少个?

(2)学校决定,再次购买钢笔和签字笔共50支作为补充奖品,其中钢笔标价每支8元,签字笔标价每支6元.经过沟通,这次老板给予8折优惠,合计272元.问小明购买了钢笔和签字笔各多少支?

23.(10分)用同样规格的黑白两种颜色的正方形地砖,按如图所示的方式组成图案:

(1)根据排列规律,第4个图案中有个黑色正方形地砖,有 个白色正方形地砖;

(2)请写出第nn为正整数)个图案中黑色正方形地砖数和白色正方形地砖数(用含n的代数式表示).

24.(12分)已知有理数ab在数轴上的对应点如图所示.

(1)已知a=﹣2.3,b=0.4,计算|a+b|﹣|a|﹣|1﹣b|的值;

(2)已知有理数ab,计算|a+b|﹣|a|﹣|1﹣b|的值.

25.(12分)如图,∠AOB=120°,射线OCOA开始,绕点O逆时针旋转,旋转的速度为每分钟20°;射线ODOB开始,绕点O逆时针旋转,旋转的速度为每分钟5°,OCOD同时旋转,设旋转的时间为t(0≤t≤15).

(1)当t为何值时,射线OCOD重合;

(2)当t为何值时,∠COD=90°;

(3)试探索:在射线OCOD旋转的过程中,是否存在某个时刻,使得射线OC,OBOD中的某一条射线是另两条射线所夹角的角平分线?若存在,请求出所有满足题意的t的取值,若不存在,请说明理由.

2024-2025学年广东省广州市白云区七年级(上)期末数学试卷

参考答案与试题解析

题号

1

2

3

4

5

6

7

8

9

10

答案

A

A

D.

C

B

A

D

D

A

D

一、选择题(本大题共10小题,每小题3分,满分30分.在每小题给出的四个选项中,只有一项是符合题目要求的.)

1.(3分)中国是最早采用正负数来表示相反意义的量的国家,如果上升50米,记作+50米,那么下降100米,记作(  )

通过网盘分享的文件:初中7上2024-2025数学期末试卷等3个文件

链接: https://pan.baidu.com/s/14Nc0vr83-eWjDfiRkN_xGw?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000509s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000691s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000365s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000466s ]
  6. SELECT * FROM `set` [ RunTime:0.000576s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000568s ]
  8. SELECT * FROM `article` WHERE `id` = 469500 LIMIT 1 [ RunTime:0.000416s ]
  9. UPDATE `article` SET `lasttime` = 1772898504 WHERE `id` = 469500 [ RunTime:0.000994s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000210s ]
  11. SELECT * FROM `article` WHERE `id` < 469500 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000427s ]
  12. SELECT * FROM `article` WHERE `id` > 469500 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000354s ]
  13. SELECT * FROM `article` WHERE `id` < 469500 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000728s ]
  14. SELECT * FROM `article` WHERE `id` < 469500 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000743s ]
  15. SELECT * FROM `article` WHERE `id` < 469500 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001202s ]
0.075686s