word/media/image1.gif
一、选择题 (本题共12个小题,每小题3分,共36分.将正确答案的字母填入方框中)
1.a223b986125e674d2764c0d2b3aa4055.png
A.-2 B.7ddf743a44884d9bbc8c1789b835ac41.png
2.已知x = 0是关于x的方程5x-4m = 8的解,则 m 的值是( )
A.27abf3c3c0ceec6fce6416dc3fcf1951.png
3.下列方程为一元一次方程的是( ) This article includes some parts, including text, pictures, and design.
A.y+3= 0 B.x+2y=3 C.x2=2x D.b4272f1efe36e8fa1fb15e18216903ac.png
4.下列各组数中,互为相反数的是( )
A.136154b097997304d7ec405bf494f68f.png
5.下列各组单项式中,为同类项的是( )
A.a26a99f9b2f21ca3ba6f222efa40c7958.png
6.如图,数轴A、B上两点分别对应实数a、b,则下列结论正确的是
A.a+b>0 B.ab >0 C.c140570d17688caa710da44208ff22f5.png
7.下列各图中,可以是一个正方体的平面展开图的是( )This article includes some parts, including text, pictures, and design.
word/media/image18.gif
8.如图,钟表8时30分时,时针与分针所成的角的度数为( )
A.30° B.90° C.60° D.75°
word/media/image19.gif9.在灯塔O处观测到轮船M位于北偏西54°的方向,同时轮船N在南偏东15°的方向,那么∠MON的大小为 ( )
A.69° B.111° C.141° D.159°This article includes some parts, including text, pictures, and design.
10.一件毛衣先按成本提高30%标价,再以6折(标价的60%)出售,结果获
利20元,若设这件毛衣的成本是x元,根据题意,可得到的方程是( )
A.(1+30%)x×60%=x-20 B.(1+30%)x×60%=x+20
C.(1+30%x)×60%=x-20 D.(1+30%x)×60%=x+20
11.轮船沿江从P港顺流行驶到Q港,比从Q港返回P港少用3小时,若船速为26千米/时,水速为2千米/时,求P港和Q港相距多少千米.设P港和Q港相距x千米.根据题意,可列出的方程是 ( )
A.c140570d17688caa710da44208ff22f5.png
12.填在下面各正方形中的四个数之间都有相同的规律,根据这种规律,A的值应是( )
word/media/image24.gif
A.110 B.158 C.168 D.178
二、填空题(本大题共8个小题;每小题3分,共24分.把答案写在题中横线上)
13.-3的倒数是________. This article includes some parts, including text, pictures, and design.
14.单项式7ddf743a44884d9bbc8c1789b835ac41.png
15.若x=2是方程8-2x=ax的解,则a=_________.This article includes some parts, including text, pictures, and design.
16.计算:15°37′+42°51′=_________.This article includes some parts, including text, pictures, and design.
17.青藏高原是世界上海拔最高的高原,它的面积约为2 500 000平方千米.将2 500 000用科学记数法表示应为_________________平方千米.
18.已知,a-b=2,那么2a-2b+5=_________.This article includes some parts, including text, pictures, and design.
19.已知y1=x+3,y2=2-x,当x=_________时,y1比y2大5.
20.根据图中提供的信息,可知一个杯子的价格是________元.
word/media/image25.gif
三、解答题(本大题共8个小题;共60分)This article includes some parts, including text, pictures, and design.
21.(本小题满分6分)计算:(-1)3-eca3bf81573307ec3002cf846390d363.png
This article includes some parts, including text, pictures, and design.
22.(本小题满分6分)
一个角的余角比这个角的93b05c90d14a117ba52da1d743a43ab1.png
23.(本小题满分7分)This article includes some parts, including text, pictures, and design.
先化简,再求值:eca3bf81573307ec3002cf846390d363.png
This article includes some parts, including text, pictures, and design.
24.(本小题满分7分) 解方程:827614c8d2467cafc70809be014bec00.png
25.(本小题满分8分)This article includes some parts, including text, pictures, and design.
一点A从数轴上表示+2的点开始移动,第一次先向左移动1个单位,再向右移动2个单位;第二次先向左移动3个单位,再向右移动4个单位;第三次先向左移动5个单位,再向右移动6个单位……
(1)写出第一次移动后这个点在数轴上表示的数为 ;This article includes some parts, including text, pictures, and design.
(2)写出第二次移动结果这个点在数轴上表示的数为 ;This article includes some parts, including text, pictures, and design.
(3)写出第五次移动后这个点在数轴上表示的数为 ;This article includes some parts, including text, pictures, and design.
(4)写出第n次移动结果这个点在数轴上表示的数为 ;This article includes some parts, including text, pictures, and design.
(5)如果第m次移动后这个点在数轴上表示的数为56,求m的值.This article includes some parts, including text, pictures, and design.
word/media/image34.gif26.(本小题满分8分)This article includes some parts, including text, pictures, and design.
如图,∠AOB=∠COD=90°,OC平分∠AOB,∠BOD=3∠DOE.
求:∠COE的度数.
27.(本小题满分8分)
word/media/image35.gif 如图,已知线段AB和CD的公共部分BD=7964c6a339acf2ddea25a5ef0552b97e.png
28.(本小题满分10分)
在学校的一次劳动中,在甲处劳动的有27人,在乙处劳动的有19人,后因劳动任务需要,需要另外调20人来支援,使在甲处的人数是在乙处人数的2倍,问应分别调往甲、乙两处各多少人?
参考答案
一、选择题(每小题3分,共36分)
1.C ;2.D ;3.A;4.D;5.B;6. D;7.C;8.D;9.C;10. B;11.A;12.B.
二、填空题(每题3分,共24分)
13.55deec8385928777f1cdd8a667f0cad0.png
三、解答题(共60分)This article includes some parts, including text, pictures, and design.
21.解:原式= -1-eca3bf81573307ec3002cf846390d363.png
=-1+ b0cdadb8bdea36abcccdd0db8a2358bc.png
=9df743fb4a026d67e85ab08111c4aedd.png
22.解:设这个角的度数为x. ……………………………………………………………1分
由题意得: 37f2bf5b254e7c2f40a9990c94084143.png
解得:x=80 …………………………………………………………………5分
答:这个角的度数是80° ……………………………………………………………6分
23.解:原式 =46d1439493930f1d07447aa38b5a38b4.png
=7b69b84a7f3fbfa6239b5f623b6f88ce.png
把x=93b05c90d14a117ba52da1d743a43ab1.png
原式=7b69b84a7f3fbfa6239b5f623b6f88ce.png
=94bc85b7678c72c91cec63f0433b4440.png
24.解:ec8b0feb9fe3cd56402d743bf8312c9f.png
22a57271e1a43f2403b1eb1b37897c78.png
8x=3. …………………………………………………………6分
bc21fb76df11db348ede6e06c61f940f.png
This article includes some parts, including text, pictures, and design.
25.解:(1)第一次移动后这个点在数轴上表示的数是3; ……………………………1分
(2)第二次移动后这个点在数轴上表示的数是4; ……………………………2分
(3)第五次移动后这个点在数轴上表示的数是7; ……………………………4分
(4)第n次移动后这个点在数轴上表示的数是n+2; …………………………6分
(5)54. ………………………………………………………………………8分
26.解:∵∠AOB=90°,OC平分∠AOBThis article includes some parts, including text, pictures, and design.
∴∠BOC=93b05c90d14a117ba52da1d743a43ab1.png
∵∠BOD=∠COD-∠BOC=90°-45°=45°, ………………………………4分
∠BOD=3∠DOE
∴∠DOE=15, ……………………………………………………………………7分
∴∠COE=∠COD-∠DOE=90°-15°=75° …………………………………8分
27.解:设BD=xcm,则AB=3xcm,CD=4xcm,AC=6xcm. …………………………1分
∵点E、点F分别为AB、CD的中点,
∴AE=93b05c90d14a117ba52da1d743a43ab1.png
∴EF=AC-AE-CF=2.5xcm. ………………………………………………………4分
∵EF=10cm,This article includes some parts, including text, pictures, and design.
∴2.5x=10,解得:x=4. ………………………………………………………………6分
∴AB=12cm,CD=16cm. ……………………………………………………………8分
28.(10分)在学校的一次劳动中,在甲处劳动的有27人,在乙处劳动的有19人,后因劳动任务需要,需要另外调20人来支援,使在甲处的人数是在乙处人数的2倍,问应分别调往甲、乙两处各多少人?
解:设应调往甲处x人,依题意得:This article includes some parts, including text, pictures, and design.
5e84352e993fd81f90574a1f0add00a3.png
f486b5128d65e046c1a70b9074946bb2.png
9dd4e461268c8034f5c8564e155c67a6.png
39dd4e461268c8034f5c8564e155c67a6.png
∴20-9dd4e461268c8034f5c8564e155c67a6.png
答:应调往甲处17人,调往乙处3人.………………………………………………………10分
版权申明
本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有
This article includes some parts, including text, pictures, and design. Copyright is personal ownership.
用户可将本文地内容或服务用于个人学习、研究或欣赏,以及其他非商业性或非盈利性用途,但同时应遵守著作权法及其他相关法律地规定,不得侵犯本网站及相关权利人地合法权利.除此以外,将本文任何内容或服务用于其他用途时,须征得本人及相关权利人地书面许可,并支付报酬.
Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee.
转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用,不得对本文内容原意进行曲解、修改,并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.
本文来源:https://www.2haoxitong.net/k/doc/81d641d66d1aff00bed5b9f3f90f76c661374c80.html
文档为doc格式