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七下数学期中试卷(附答案)

  • 2026-05-09 08:01:53
七下数学期中试卷(附答案)

一、选择题(本大题共10小题,每小题4分,共40分)

1.(4分)如图所示,下列判断正确的是(  )

A.图(1)中∠1与∠2是一组对顶角

B.图(2)中∠1与∠2是一组对顶角

C.图(3)中∠1与∠2是一组邻补角

D.图(4)中∠1与∠2是互为邻补角

2.(4分)实数,﹣0.125,中无理数的个数是(  )

A.0B.1C.2D.3

3.(4分)如图,小手盖住的点的坐标可能为(  )

A.(3,2)B.(﹣3,﹣2)C.(3,﹣2)D.(﹣3,2)

4.(4分)下列方程是二元一次方程的是(  )

A.x+2=1B.x2+2y=2C.D.

5.(4分)根据不等式的基本性质,以下各题的结论正确的是(  )

A.若ab,则5b≤5aB.若b﹣3a>0,则b<3a

C.若﹣5x≥20,则x≥﹣4D.若ab,则acbc

6.(4分)下列各式中,正确的是(  )

A.=±4B.C.D.

7.(4分)如图,已知ab,直角三角板的直角顶点在直线a上,若∠1=40°,则∠2等于(  )

A.40°B.50°C.60°D.70°

8.(4分)已知实数a在数轴上的位置如图所示,则化简|1﹣a|+的结果为(  )

A.1B.﹣1C.1﹣2aD.2a﹣1

9.(4分)如图,直线ABCD相交于点O,∠DOEα,∠DOF:∠AOD=2:3,射线OE平分∠BOF,则∠BOC=(  )

A.540°﹣5αB.540°﹣6αC.30°D.40°

10.(4分)已知a为正整数,关于xy的方程组的解都是整数,则a2=(  )

A.1或16B.4或16C.1D.16

二、填空题(本大题共8小题,每空4分,共32分)

11.(4分)已知方程x﹣2y=3,用含x的式子表示y

12.(4分)将命题“正方形的四条边都相等”改为“如果…那么…”的形式为

13.(4分)已知ab为两个连续的整数,且ab,则a+b

14.(4分)已知是方程3xay=8的解,则a

15.(4分)如图,下列条件中能得到ABCD的有

(1)∠1=∠2(2)∠2=∠3

(3)∠1=∠4(4)∠3=∠4

16.(4分)我国古代数学专著《九章算术》中记载了一道题,今有牛五、羊二,直金十两.牛二、羊五直金八两.问牛羊各直金几何?大意是:已知买五头牛和两头羊,需花费十两黄金;买两头牛,五头羊需花费八两黄金.若设买一头牛需花费x两黄金,买一只羊需要花费y两黄金,那么可列方程组为

17.(4分)如图,在平面直角坐标系中,已知点A(1,1),B(﹣1,1),C(﹣1,﹣2),D(1,﹣2),把一根长为2019个单位长度且没有弹性的细线(线的粗细忽略不计)的一端固定在A处,并按ABCDA…的规律紧绕在四边形ABCD的边上,则细线的另一端所在位置的点的坐标是

18.(4分)若关于x,y的方程组的解满足xy,p的取值范围为

三、解答题(本大题共9小题,共78分)

19.(6分)计算:

20.(6分)解方程组:

21.(6分)解不等式,并在数轴上表示出它的解集:﹣1≥x

22.(7分)已知5a+2的立方根是3,4a+2b﹣8的算术平方根是4,求a+3b的平方根.

23.(7分)已知△ABC三个顶点A,B,C的坐标分别为(﹣1,4),(﹣2,2),(1,3)

(1)在坐标系中画出△ABC,把△ABC先向右平移3个单位,再向下平移2个单位得到△A1B1C1,画出平移后的△A1B1C1

(2)△ABC中的任意一点Pm,n)经平移后的对应点为Q,写出Q点的坐标是(用含m,n的式子表示)

24.(8分)如图,点D,E,F分别在ABBCAC上,且∠B=∠3,ED平分∠BEF,

求证:∠1=∠4.

25.(13分)白鹭飞跃,河水泛起涟漪;清风徐来,建筑的倒影在碧波上荡漾,流花溪位于仓山区高宅村内,作为福州水系统综合治理的重点项目,伴随着福州水系综合治理的冲锋号一路“护航”,经过两年的治理,消除了黑臭、畅通了水脉、种下了美景,焕发了全新的活力.近来更成了网红“打卡”地.

如今,福州水系综合治理还要继续下去,现决定购买10台污水处理设备,商家提供A,B两种型号的设备,其中每台的价格,月处理污水量如表:

A

B

价格(万元/台)

a

b

处理污水量(吨/月)

240

200

经了解:购买一台A型设备比购买一台B型设备多2万元,购买2台A型设备比购买3台B型设备少6万元.

(1)求a,b的值.

(2)治污公司经预算购买污水处理设备的资金不超过105万元,你认为该公司有哪几种购买方案,请将它们写出来.

(3)在(2)问的条件下,若每月要求处理污水量不低于2040吨,为了节约资金,请你按照题目要求为治污公司设计一种最省钱的购买方案.

26.(13分)在同一平面内,若一个点到一条直线的距离不大于1,则称这个点是该直线的“伴侣点”.

在平面直角坐标系中,已知点M(2,0),过点M作直线l平行于y轴,点A(0,a),点Bb+1,2a),点C﹣1),将△ABC进行平移,平移后点A的对应点为D,点B的对应点为E,点C的对应点为F

(1)试判断点A是否是直线l的“伴侣点”?(填“是”或者“否”)

(2)若点F刚好落在直线l上,F的纵坐标为a+b,点E落在x轴上,且△MFD的面积为

D , );E , );F , )(用只含字母a的代数式表示)

试判断点B是否是直线l的“伴侣点”?并通过计算说明理由.

27.(12分)如图,在平面直角坐标系中,点A,B的坐标分别为(0,1),(0,﹣3),现将点A向右平移2个单位,再向下平移1个单位,得到点C,点D在点C的下方,CDx轴,且CD的长度为4,连接AC,BD,CD

(1)填空:点D的坐标为

(2)若P点在直线BD上运动,连接PCPO

P在线段BD上(不与B,D重合),求SCDP+SBOP的取值范围.

P在直线BD上运动,请在考卷的图中画出相应的示意图,并写出∠CPO、∠DCP、∠BOP的数量关系.

参考答案

一、选择题(本大题共10小题,每小题4分,共40分)

1.D; 2.C; 3.B; 4.C; 5.A; 6.D; 7.B; 8.A; 9.B; 10.D;

二、填空题(本大题共8小题,每空4分,共32分)

11.; 12.如果一个四边形为正方形,那么它的四条边都相等; 13.9; 14.1; 15.(3)∠1=∠4; 16.; 17.(1,0); 18.p<﹣7

三、解答题(本大题共9小题,共78分)

19【解答】解:原式=3﹣3+2﹣

=2﹣

20【解答】解:

+,得3x=﹣3,

解得x=﹣1,③

代入,解得y=2,

∴原方程组的解是:

21【解答】解:x﹣5﹣3≥3x,

x﹣3x≥3+5,

﹣2x≥8,

x≤﹣4,

将不等式的解集表示在数轴上如下:

22【解答】解:∵5a+2的立方根是3,4a+2b﹣8的算术平方根是4,

∴5a+2=27,4a+2b﹣8=16,

a=5,b=2,

a+3b=5+6=11,

a+3b的平方根是±

23【解答】解:(1)如图所示,△A1B1C1即为所求:

(2)Q点的坐标是m+3,n﹣2)

故答案为:(m+3,n﹣2)

24【解答】证明:∵∠B=∠3,

ABEF,

∴∠2=∠4,

ED平分∠BEF,

∴∠1=∠2,

∴∠1=∠4.

25【解答】解:(1)依题意,得:

解得:

答:a的值为12,b的值为10.

(2)设购买xA型设备,则购买(10﹣x)台B型设备,

依题意,得:12x+10(10﹣x)≤105,

解得:x

x为非负整数,

x=0,1,2,

∴共有3种购买方案,方案1:购买10台B型设备;方案2:购买1台A型设备,9台B型设备;方案3:购买2台A型设备,8台B型设备.

(3)依题意,得:240x+200(10﹣x)≥2040,

解得:x≥1.

又∵x,且x为非负整数,

x=1,2.

x=1时,10﹣x=9,此时购买费用为12×1+10×9=102(万元);

x=2时,10﹣x=8,此时购买费用为12×2+10×8=104(万元).

∵102<104,

∴省钱的购买方案为:购买1台A型设备,9台B型设备.

26【解答】解:(1)∵A(0,a),直线lx=2,

∴点A到直线l的距离为2,2>1,

∴点A不是直线l的“伴侣点”,

故答案为:否;

(2)C﹣1)→F(2,a+b),

∴横坐标加,纵坐标加(b+1),

D+b+1),Eb+a+b+1);

故答案为:+b+1;b+a+b+1;

∵点E落在x轴上,

∴2a+b+1=0,

∵三角形MFD的面积为

•|a+b|=

a+b=±

a+b时,解得a=﹣,此时B,﹣),点B是直线l的“伴侣点”.

a+b=﹣时,a=﹣,此时B,﹣),点B是直线l的“伴侣点”.

27【解答】解:(1)∵点A,B的坐标分别为(0,1),(0,﹣3),

AB=4,

由题意得:C(2,0),

CD=4,ABCD,

D(2,﹣4).

故答案为(2,﹣4);

(2)如图1中,S梯形OCDB×(3+4)×2=7,

当点P运动到点B时,SPOC最小,SPOC的最小值=×3×2=3,此时SCDP+SBOP=4,

当点P运动到点D时,SPOC最大,SPOC的最大值=×4×2=4,SCDP+SBOP=3,

所以3<SCDP+SBOP<4;

当点PBD上,如图1,作PECD,

CDAB,

CDPEAB,

∴∠DCP=∠EPC,∠BOP=∠EPO,

∴∠DCP+∠BOP=∠EPC+∠EPO=∠CPO

当点P在线段BD的延长线上时,如图2,作PECD,

CDAB,

CDPEAB,

∴∠DCP=∠EPC,∠BOP=∠EPO,

∴∠EPO﹣∠EPC=∠BOP﹣∠DCP,

∴∠BOP﹣∠DCP=∠CPO

同理可得当点P在线段DB的延长线上时,∠DCP﹣∠BOP=∠CPO

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  1. CONNECT:[ UseTime:0.000689s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000806s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002688s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001383s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001374s ]
  6. SELECT * FROM `set` [ RunTime:0.000506s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001094s ]
  8. SELECT * FROM `article` WHERE `id` = 490348 LIMIT 1 [ RunTime:0.002788s ]
  9. UPDATE `article` SET `lasttime` = 1778289562 WHERE `id` = 490348 [ RunTime:0.003946s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000467s ]
  11. SELECT * FROM `article` WHERE `id` < 490348 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001518s ]
  12. SELECT * FROM `article` WHERE `id` > 490348 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003759s ]
  13. SELECT * FROM `article` WHERE `id` < 490348 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005028s ]
  14. SELECT * FROM `article` WHERE `id` < 490348 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015785s ]
  15. SELECT * FROM `article` WHERE `id` < 490348 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009608s ]
0.201597s