2018-2019学年广东省东莞市虎门外语学校、宏远外语学校、丰泰外语学校联考七年级(上)期末数学试卷-解析版

2018-2019学年广东省东莞市虎门外语学校、宏远外语学校、丰泰外语学校联考七年级(上)期末数学试卷-解析版
2018-2019学年广东省东莞市虎门外语学校、宏远外语学校、丰泰外语学校联考七年级(上)期末数学试卷-解析版

2018-2019学年广东省东莞市虎门外语学校、宏远外语学校、丰泰外语学校联考七年级(上)期末数学试卷

一、选择题(本大题共10小题,共30.0分)

1.-2的绝对值是()

A. B. C. 2 D.

2.港珠澳大桥2018年10月24日上午9时正式通车,这座大桥跨越伶仃洋,东接香港,西接广东珠海和

澳门,总长约55000m,集桥、岛、隧于一体,是世界最长的跨海大桥,数据55000用科学记数法表示为()

A. B. C. D.

3.单项式-5x2yz2的系数和次数分别是()

A. 5,4

B. ,5

C. 5,5

D. ,

4.下列运算中,正确的是()

A. B. C. D.

5.下列方程中,解为x=-2的方程是()

A. B. C. D.

6.如图,点D是线段AB的中点,C是线段AD的中点,若AB=16cm,

则线段CD=()cm.

A. 2

B. 4

C. 8

D. 16

7.将“中国梦我的梦”六个字分别写在一个正方体的六个面上,这个正方体的展开图

如图,那么在这个正方体中,和“我”字相对的字是()

A. 中

B. 国

C. 的

D. 梦

8.若有理数a、b在数轴上的对应点的位置如图所示,则

下列结论中错误的是()

A. B. C. D.

9.下午2点30分时(如图),时钟的分针与时针所成角的度数为()

A. B. C. D.

10.现用90立方米木料制作桌子和椅子,已知一张桌子配4张椅子,1立方米木料可做5张椅子或1张桌

子,要使桌子和椅子刚好配套.设用x立方米的木料做桌子,则依题意可列方程为()

A. B. C. D.

二、填空题(本大题共6小题,共24.0分)

11.比较大小:-3______-4(用“>”“=”或“<”表示).

12.2xy-6xy=______.

13.当代数式2x-2与3+x的值相等时,x=______.

14.已知∠A=56°34′,则∠A的补角的度数是______.

15.已知x-4y=2,那么-5+2x-8y的值为______.

16.已知:A、B、C三个点在同一直线上,若线段AB=8,BC=5,则线段AC=______.

三、计算题(本大题共5小题,共33.0分)

17.解方程:.18.随着中国快递行业整体规模的迅速壮大,分拣机器人系统的应用也呈现智能化、自动化

的发展趋势.每台分拣机器人一小时可以分拣1.8万件包裹,大大提高了分拣效率.某分拣仓库计划平均每天分拣20万件包裹,但实际每天分拣量与计划相比有出入,下表是该仓库10月份第一周分拣包裹的情况(超过计划量记为正、未达计划量记为负):

(1)该仓库本周内分拣包裹数量最多的一天是星期______,最少的一天是星期______,最多的一天比最少的一天多分拣了______万件包裹;

(2)该仓库本周实际分拣包裹一共多少万件?

19.如图,点B、C把线段MN分成三部分,其比是MB:BC:CN=2:3:4,P是MN的中点,且MN=18cm,

求PC的长.

20.计算:|-12019|+(1-32)×2-(-2)3÷16

21.先化简,再求值3(a2b-ab2)-2(2a2b-1)+3ab2-1,其中a=-2,b=1.

四、解答题(本大题共4小题,共33.0分)

22.2x-5y+3x+y-2

23.某自来水公司按如下规定收取水费:每月用水不超过10吨,按每吨1.5元收费;每月用水超过10吨,

超过部分按每吨2元收费.设每月用水量为x吨.

(1)小红家3月用水10吨,应交水费多少元?

(2)试用x的代数式表示付水费的费用.

(3)小明家4月份的水费是25元,小明家4月份用水多少吨?

24.用火柴棒按下列方式搭建三角形,如图所示:

第一个图形要3根,第二个图形要5根,第三个图形要7根,

第5个图形需要______根火柴棒;

第n个图形需要______根火柴棒;

第几个图形需要用到2019根火柴棒?

25.已知点O是AB上的一点,∠COE=90°,OF平分∠AOE.

(1)如图1,当点C,E,F在直线AB的同一侧时,若∠AOC=40°,求∠BOE和∠COF的度数;

(2)在(1)的条件下,∠BOE和∠COF有什么数量关系?请直接写出结论,不必说明理由;

(3)如图2,当点C,E,F分别在直线AB的两侧时,若∠AOC=β,那么(2)中∠BOE和∠COF的数量关系是否仍然成立?请写出结论,并说明理由.

答案和解析

1.【答案】C

【解析】

解:因为|-2|=2,

故选:C.

根据负数的绝对值等于它的相反数求解.

绝对值规律总结:一个正数的绝对值是它本身;一个负数的绝对值是它的相反数;0的绝对值是0.

2.【答案】C

【解析】

解:55000=5.5×104,

故选:C.

科学记数法的表示形式为a×10n的形式,其中1≤|a|<10,n为整数.确定n的值时,要看把原数变成a时,小数点移动了多少位,n的绝对值与小数点移动的位数相同.当原数绝对值>10时,n是正数;当原数的绝对值<1时,n是负数.

此题考查科学记数法的表示方法.科学记数法的表示形式为a×10n的形式,其中1≤|a|<10,n为整数,表示时关键要正确确定a的值以及n的值.

3.【答案】B

【解析】

解:单项式-5x2yz2的系数和次数分别是-5,5.

故选:B.

根据单项式系数、次数的定义来求解.单项式中数字因数叫做单项式的系数,所有字母的指数和叫做这个单项式的次数.

考查了单项式,解答此题关键是构造单项式的系数和次数,把一个单项式分解成数字因数和字母因式的积,是找准单项式的系数和次数的关键.

4.【答案】C

【解析】解:A、3a与2b不是同类项,不能合并,此选项错误;

B、2a3与3a2不是同类项,不能合并,此选项错误;

C、-4a2b+3ba2=-a2b,此选正确;

D、5a2-4a2=a2,此选项错误;

故选:C.

根据同类项的定义和合并同类项的法则逐一判断即可得.

本题主要考查合并同类项,解题的关键是掌握同类项的定义和合并同类项的法则.

5.【答案】B

【解析】

解:分别将x=-2代入题目中的四个方程:

A、左边=-2-2=-4≠右边,该方程的解不是x=-2,故本选项错误;

B、左边=2-6=-4=右边,该方程的解是x=-2,故本选项正确;

C、左边=-6-1=-7≠右边,该方程的解不是x=-2,故本选项错误;

D、左边=4+6=10≠右边,该方程的解不是x=-2,故本选项错误;

故选:B.

方程的解就是能够使方程左右两边相等的未知数的值,把x=2代入各个方程进行进行检验,看能否使方程的左右两边相等.

本题的关键是正确理解方程的解的定义,就是能够使方程左右两边相等的未知数的值.

6.【答案】B

【解析】

解:由点D是线段AB的中点,得

AD=

AB=×16=8cm,

由C是线段AD的中点,得

CD=

AD=×8=4cm.

故选:B.

根据线段中点的性质,可得答案.

本题考查了两点间的距离,利用了线段的中点分线段相等.

7.【答案】B

【解析】

解:正方体的表面展开图,相对的面之间一定相隔一个正方形,

“中”与“梦”是相对面,

“国”与“我”是相对面,

“梦”与“的”是相对面.

故选:B.

正方体的表面展开图,相对的面之间一定相隔一个正方形,根据这一特点作答.

本题主要考查了正方体相对两个面上的文字,注意正方体的空间图形,从相对面入手,分析及解答问题.

8.【答案】C

【解析】

解:由数轴可知,a<0,b>0

选项A,a<0,b>0,a<b,选项正确

选项B,ab<0,正确

选项C,∵|a|>|b|,∴a<-b,选项错误

选项D,∵|a|>|b|,∴a+b<0,选项正确

故选:C.

数轴的点左右的数,右边的总比左边的大.

此题考查的是数轴点的规律.数轴上的点右边数比左边的大,位于原点左边的数小于零,右边

的数大于零

9.【答案】B

【解析】

解:∵1个小时在时钟上的角度为180°÷6=30°,

∴3.5个小时的角度为30°×3.5=105°.故选:B.

钟表12个数字,每相邻两个数字之间的夹角为30度.

本题主要考查角度的基本概念.在钟表问题中,常利用时针与分针转动的度数关系:分针每转动1°时针转动()°,并且利用起点时间时针和分针的位置关系建立角的图形.

10.【答案】A

【解析】

解:设用x立方米的木料做桌子,则用(90-x)立方米的木料做椅子,

依题意,得:4x=5(90-x).

故选:A.

设用x立方米的木料做桌子,则用(90-x)立方米的木料做椅子,根据制作的椅子数为桌子数的4倍,即可得出关于x的一元一次方程,此题得解.

本题考查了由实际问题抽象出一元一次方程,找准等量关系,正确列出一元一次方程是解题的关键.

11.【答案】>

【解析】

解:根据有理数大小比较的规律可得两个负数中绝对值大的反而小,-3>-4.

故答案为:>.

本题是基础题,考查了实数大小的比较.两负数比大小,绝对值大的反而小;或者直接想象在数轴上比较,右边的数总比左边的数大.

规律总结:(1)在以向右方向为正方向的数轴上两点,右边的点表示的数比左边的点表示的数大.

(2)正数大于0,负数小于0,正数大于负数.

(3)两个正数中绝对值大的数大.

(4)两个负数中绝对值大的反而小.

12.【答案】-4xy

【解析】

解:2xy-6xy=-4xy,

故答案为:-4xy

根据把同类项的系数相加,所得结果作为系数,字母和字母的指数不变解答即可.

此题考查合并同类项,关键是根据合并同类项的法则解答.

13.【答案】5

【解析】

解:根据题意得:2x-2=3+x,

移项合并得:x=5,

故答案为:5.

根据题意列出方程,求出方程的解即可得到x的值.

此题考查了解一元一次方程,熟练掌握运算法则是解本题的关键.

14.【答案】123°26′

【解析】

解:∵∠A=56°34′,

∴∠A的补角=180°-∠A=180°-56°34′=123°26′.

故答案为:123°26′

根据补角的定义可解.

本题主要考查了补角的定义以及角的度分秒运算,正确理解补角的定义是解题的关键.

15.【答案】-1

【解析】

解:把x-4y=2代入-5+2x-8y=-5+2(x-4y)=-5+4=-1,

故答案为:-1

根据题意x-4y=2,再变形后代入求出即可.

本题考查了求代数式的值的应用,能整体代入是解此题的关键.

16.【答案】13或3

【解析】

解;如图①:AC=AB+BC=5+8=13,

如图②:AC=AB-BC=8-5=3.

故答案为:13或3.

根据题意画出图形,分两种情况:①C在AB的右边;②C在AB之间.

此题主要考查了两点间的距离,关键是考虑到两种情况.17.【答案】解:去分母得:5(y-1)=20-2(y+2),

去括号得:5y-5=20-2y-4,

移项合并得:7y=21.

解得:y=3.

【解析】

方程去分母,去括号,移项合并,将y系数化为1,即可求出解.

此题考查了解一元一次方程,其步骤为:去分母,去括号,移项合并,将未知数系数化为1,求

出解.

18.【答案】六日15

【解析】

解:(1)∵-8<-4<-3<-1<+5<+6<+7,

∴分拣最多的一天是星期六,分拣最少的一天是星期天,

分拣最多的一天比分拣最少的一天多分拣了:+7-(-8)=15(万件),

故答案为:六,日,15;

(2)∵-8-4-3-1+5+6+7=2(万件),

∴20×7+2=142(万件)

答:该仓库本周实际分拣包裹142万件.

(1)比较分拣情况的出入数,用不等号连接起来,得到分拣包裹数量的最多最少,最多一天减去最少一天得多分拣包裹数;

(2)把每天的分拣包裹数相加即可.

主要考查正负数在实际生活中的应用及有理数大小的比较.看懂图表是关键.

19.【答案】解:设MB=2x,则BC=3x,CN=4x,

因为P是MN中点,

所以MP=MN=×(2x+3x+4x)=x=9.

解得x=2,

∴PC=MC-MP=2x+3x-x=0.5x=1.

【解析】

设MB的长为2x,分别表示出BC=3x,CN=4x,进一步利用线段中点的意义和线段的和与差解决问题.

本题考查了两点间的距离,线段中点的定义,本题根据比例用x表示出三条线段求解更简便.

20.【答案】解:|-12019|+(1-32)×2-(-2)3÷16

=1+(1-9)×2-(-8)×

=1+(-8)×2+

=1+(-16)+

=-14.

【解析】

根据有理数的乘除法和加减法可以解答本题.

本题考查有理数的混合运算,解答本题的关键是明确有理数混合运算的计算方法.

21.【答案】解:原式=3a2b-3ab2-4a2b+2+3ab2-1=-a2b+1,

当a=-2,b=1时,原式=-3.

【解析】

原式去括号合并得到最简结果,把a与b的值代入计算即可求出值.

此题考查了整式的加减-化简求值,熟练掌握运算法则是解本题的关键.

22.【答案】解:2x-5y+3x+y-2

=2x+3x-5y+y-2

=5x-4y-2.

【解析】

根据合并同类项解答即可.

此题考查合并同类项,关键是根据合并同类项解答.

23.【答案】解:(1)依题意得:10×1.5=15(元)

答:应交水费15元.

(2)①当0≤x≤10时,需要付水费:1.5x.

②当x>10时,需要付水费:15+2(x-10)=2x-5.

(3)因为25>10×1.5,

所以小明家4月份用水超过10吨,

依题意得:2x-5=25

解得x =15

答:小明家4月份用水15吨.

【解析】

(1)根据收费标准“每月用水不超过10吨,按每吨1.5元收费”计算.(2)需要对x的取值范围进行分类讨论:0≤x≤10,x>10,结合收费标准解答.

(3)收费25元时,按照“每月用水超过10吨,超过部分按每吨2元收费”解答.

本题考查了一元一次方程的应用,解题关键是要读懂题目的意思,根据题目给出的条件,找出

合适的等量关系列出方程,再求解.

24.【答案】11 2n+1

【解析】

解:设第n个图形需要a n(n为正整数)根火柴棒,

观察,发现规律:a1=3,a2=5,a3=7,a4=9,…,

∴a n=2n+1.

当n=5时,a5=2×5+1=11.

当2n+1=2019时,解得:n=1009.

故答案为:11;2n+1.

设第n个图形需要a n(n为正整数)根火柴棒,根据给定图形找出部分a n的值,根据数值的变化找出变化规律“a n=2n+1”,依此规律即可得出结论.

本题考查了规律型中的图形的变化类,解题的关键是找出变化规律“a n=2n+1”.本题属于基础题,难度不大,解决该题型题目时,根据给定图形中的数据找出变化规律是关键.

25.【答案】解:(1)∵∠COE=90°,∠AOC=40°,

∴∠BOE=180°-∠AOC-∠COE=180°-40°-90°=50°,

∠AOE=∠AOC+∠COE=40°+90°=130°,

∵OF平分∠AOE,

∴∠EOF=∠AOE=×130°=65°,

∴∠COF=∠COE-∠EOF=90°-65°=25°;

(2)∠BOE=2∠COF.

(3)∠BOE=2∠COF.

理由如下:∵∠COE=90°,∠AOC=β,

∴∠AOE=∠COE-∠AOC=90°-β,

∴∠BOE=180°-∠AOE=180°-(90°-β)=90°+β,

∵OF平分∠AOE,

∴∠AOF=∠AOE=(90°-β)=45°-β,

∴∠COF=β+(45°-β)=45°+β,

∴2∠COF=2(45°+β)=90°+β,

∴∠BOE=2∠COF.

【解析】

(1)求出∠BOE和∠COF的度数即可判断;

(2)由(1)即可求解;

(3)结论:∠BOE=2∠COF.根据角的和差定义即可解决问题.

本题考查角的计算,角平分线的定义等知识,解题的关键是灵活运用所学知识解决问题,属于中考常考题型.

2020年重点初中、外国语学校小升初英语试卷附答案

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