安徽省铜陵市2018-2019学年八年级第二学期期末质量监测试卷数学试题

适用年级:初二
试卷号:188543

试卷类型:期末
试卷考试时间:2019/9/28

1.单选题(共8题)

1.
在Rt△中,,则(   )
A.9B.18C.20D.24
2.
已知锐角三角形的边长是2,3,x,那么第三边x的取值范围是(  )
A.1<x<B.C.D.
3.
一次函数的图像在同一坐标系中的图象大致是(   )
A.B.
C.D.
4.
如图,直线轴交于点,依次作正方形、正方形、…正方形使得点、…,在直线上,点、…,轴上,则点的坐标是(   )
A.B.
C.D.
5.
某班抽取6名同学进行体育达标测试,成绩如下:80,90,75,80,75,80.下列关于对这组数据的描述错误的是(   )
A.中位数是75B.平均数是80C.众数是80D.极差是15
6.
下列二次根式中,最简二次根式是(   )
A.B.C.D.
7.
一个四边形,对于下列条件:①一组对边平行,一组对角相等;②一组对边平行,一条对角线被另一条对角线平分;③一组对边相等,一条对角线被另一条对角线平分;④两组对角的平分线分别平行,不能判定为平行四边形的是()
A.①B.②C.③D.④
8.
如图,△ABC的周长为20,点D,E在边BC上,∠ABC的平分线垂直于AE,垂足为N,∠ACB的平分线垂直于AD,垂足为M,若BC=8,则MN的长度为()
A.B.2C.D.3

2.选择题(共5题)

9.

根据短文内容判断下列句子正误。

    Look! It's my school dining hall.We are here for lunch every day.Before,there were many tall trees.Ten years ago,there was only a small house in my school.There was no library or computer.The playground was also small.

    Now,my school is very beautiful.The playground is big.The grass is green.We have PE and play sports on it.There is a nice teaching building in my school.It has six floors.The computer rooms are on the fourth floor and the library is on the sixth floor.We read books in the library and use the Internet in the computer rooms.

10.

根据短文内容判断下列句子正误。

    Look! It's my school dining hall.We are here for lunch every day.Before,there were many tall trees.Ten years ago,there was only a small house in my school.There was no library or computer.The playground was also small.

    Now,my school is very beautiful.The playground is big.The grass is green.We have PE and play sports on it.There is a nice teaching building in my school.It has six floors.The computer rooms are on the fourth floor and the library is on the sixth floor.We read books in the library and use the Internet in the computer rooms.

11.

My father usually{#blank#}1{#/blank#}(play)badminton on weekends.

12.

My father usually{#blank#}1{#/blank#}(play)badminton on weekends.

13.

My father usually{#blank#}1{#/blank#}(play)badminton on weekends.

3.填空题(共5题)

14.
我市在旧城改造中,计划在市内一块如下图所示的三角形空地上种植草皮以美化环境,已知这种草皮每平方米售价元,则购买这种草皮至少需要______元.
15.
如图,长方体的底面边长分别为1cm 和3cm,高为6cm.如果用一根细线从点A开始经过4个侧面缠绕一圈到达点B,那么所用细线最短需要_____cm.
16.
已知一组数据10,10,x,8的众数与它的平均数相等,则这组数的中位数是____.
17.
若二次根式有意义,则的取值范围是______.
18.
若三角形的周长为28cm,则它的三条中位线组成的三角形的周长是______.

4.解答题(共4题)

19.
如图,直线轴、轴分别相交于点,设是线段上一点,若将△沿折叠,使点恰好落在轴上的点处。求:

(1)点的坐标;
(2)直线所对应的函数关系式.
20.
某项工程由甲乙两队分别单独完成,则甲队用时是乙队的1.5倍:若甲乙两队合作,则需12天完成,请问:
(1)甲,乙两队单独完成各需多少天;
(2)若施工方案是甲队先单独施工天,剩下工程甲乙两队合作完成,若甲队施工费用为每天1.5万元,乙队施工费为每天3.5万元求施工总费用(万元)关于施工时间(天)的函数关系式
(3)在(2)的方案下,若施工期定为15~18天内完成(含15和18天),如何安排施工方案使费用最少,最少费用为多少万元?
21.
(1)
(2)
22.
如图,在菱形中,,点将对角线三等分,且,连接.

(1)求证:四边形为菱形
(2)求菱形的面积;
(3)若是菱形的边上的点,则满足的点的个数是______个.
试卷分析
  • 【1】题量占比

    单选题:(8道)

    选择题:(5道)

    填空题:(5道)

    解答题:(4道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:6

    7星难题:0

    8星难题:2

    9星难题:9