湖北省孝感市2017-2018学年度上学期期末学业水平测试8年级数学试卷

适用年级:初二
试卷号:194560

试卷类型:期末
试卷考试时间:2018/3/5

1.单选题(共9题)

1.
某轮船在静水中的速度为u千米/时,A港、B港之间的航行距离为S千米,水流速度为v千米/时.如果该轮船从A港驶往B港,接着返回A港,航行所用时间为小时,假设该轮船在静水中航行2S千米所用时间为小时,那么的大小关系为(  )
A.B.C.D.与uv的值有关
2.
下列变形是因式分解是(  )
A.B.
C.D.
3.
x-y+3=0,则xx-4y)+y(2x+y)的值为(  )
A.9B.-9C.3D.-3
4.
某种球形病毒的直径大约为0.000000102m,这个数用科学记数法表示为(  )
A.1.02×mB.1.02×mC.1.02×mD.1.02×m
5.
以下列长度(单位:cm)的三条线段为边,能组成三角形的是(  )
A.3,4,8B.4,5,9C.4,4,4D.1,2,3
6.
如图,Rt△ABC中,∠C=90°,BD平分∠ABCAC于点DAB=12,CD=3,则△DAB的面积为(  )
A.12B.18C.20D.24
7.
如图,Rt△ABC中,∠C=90°,斜边AB的垂直平分线交AB于点E,交BC于点D,连接AD,若∠B=35°,则∠CAD的度数为(  )
A.20°B.25°C.30°D.35°
8.
如图,在△ABC中,∠C=90°,∠A=30°,AC=12,点DAB的中点,点PAC上一动点,则PBPD的最小值为(  )
A.8B.10C.12D.14
9.
下列运算正确的是(  )
A.B.C.D.

2.选择题(共3题)

10.

    We have a big playground in our school .We all like to 1 games 2 after school .It's Friday .We have only two classes 3 the afternoon . 4 school is over(结束的),a lot of students go to the playground quickly.  The boys of Grade Two often 5 soccer. The girls like 6 them playing .Soccer is their favorite sport . Their teacher Mr Li also 7 football. Li Ming , Li Lei and Wei Fang are students of Grade One .They sometimes play 8 the students of Class Two. It’s half past five 9 . It's time 10dinner . My father is waiting for me at the school gate .

11.

    We have a big playground in our school .We all like to 1 games 2 after school .It's Friday .We have only two classes 3 the afternoon . 4 school is over(结束的),a lot of students go to the playground quickly.  The boys of Grade Two often 5 soccer. The girls like 6 them playing .Soccer is their favorite sport . Their teacher Mr Li also 7 football. Li Ming , Li Lei and Wei Fang are students of Grade One .They sometimes play 8 the students of Class Two. It’s half past five 9 . It's time 10dinner . My father is waiting for me at the school gate .

12.

    We have a big playground in our school .We all like to 1 games 2 after school .It's Friday .We have only two classes 3 the afternoon . 4 school is over(结束的),a lot of students go to the playground quickly.  The boys of Grade Two often 5 soccer. The girls like 6 them playing .Soccer is their favorite sport . Their teacher Mr Li also 7 football. Li Ming , Li Lei and Wei Fang are students of Grade One .They sometimes play 8 the students of Class Two. It’s half past five 9 . It's time 10dinner . My father is waiting for me at the school gate .

3.填空题(共5题)

13.
若x2+mx+16是完全平方式,则常数m的值等于__________.
14.
要使分式有意义,则的取值范围是
15.
如图,△ADB、△EDC都是等腰直角三角形,∠ADB=∠CDE=90°,点EDB上,AE的延长线与BC交于点F,若BC=5,AF=6,则EF=_________.
16.
如图,ABBCABBC,点P为线段BC上一点,PAPDPAPD,若∠A=22°,则∠D的度数为_________.
17.
已知mn是正整数,则用ab的式子表示=_________.

4.解答题(共8题)

18.
化简:.
19.
分解因式:
(1) (2)
20.
先化简,再求值:,其中a=2018.
21.
解下列方程
(1)
(2)
22.
某一工程,在工程招标时,接到甲、乙两个工程队的投标书.甲工程队施工一天,需付工程款1万元;乙工程队施工一天,需付工程款0.6万元.根据甲、乙工程队的投标书测算,可有三种施工方案:
A)甲队单独完成这项工程,刚好如期完成;
B)乙队单独完成这项工程要比规定工期多用4天;
C)若甲、乙两队合做3天后,剩下的工程由乙队单独做,也正好如期完工.
为了节省工程款,同时又能如期完工,你认为应选择哪一种方案?并说明理由.
23.
在△OAB中,OAOBOAOB.在△OCD中,OCODOCOD
(1)如图1,若AOD三点在同一条直线上,求证:SAOCSBOD
(2)如图2,若AOD三点不在同一条直线上,△OAB和△OCD不重叠.则SAOCSBOD是否仍成立?若成立,请予以证明;若不成立,也请说明理由.
(3)若AOD三点不在同一条直线上,△OAB和△OCD有部分重叠,经过画图猜想,请直接写出SAOCSBOD的大小关系.
24.
如图,在△ABC中,ABAC
(1)请按如下步骤用直尺和圆规作图(保留作图痕迹并在图中标注字母):
①作∠ABC的平分线交AC边于点D
②在BC的延长线上截取CECD
③连接DE
(2)求证:BDDE
25.
如图,等边△ABC的边长为6,点DAB上一点,DEBC于点EEFAC于点F,连接DF.若△DEF也是等边三角形,求AD的长.
试卷分析
  • 【1】题量占比

    单选题:(9道)

    选择题:(3道)

    填空题:(5道)

    解答题:(8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:3

    5星难题:0

    6星难题:14

    7星难题:0

    8星难题:2

    9星难题:3