西藏自治区左贡县中学2018-2019学年八年级上学期期末考试数学试题

适用年级:初二
试卷号:192936

试卷类型:期末
试卷考试时间:2019/3/2

1.单选题(共10题)

1.
6的相反数是(  )
A.6B.﹣6C.D.﹣
2.
数﹣0.00000324,用科学记数法表示为(  )
A.﹣324×108B.3.24×106C.﹣3.24×106D.0.324×105
3.
化简的结果是(  )
A.﹣xyB.yxC.xyD.x+y
4.
化简等于(  )
A.B.C.D.
5.
下列运算中,正确的是(  )
A.a•a2=a2B.(a22=a4C.a2•a3=a6D.(a2b)3=a2•b3
6.
下列计算中,正确的是()
A.X3+X3=X6B.a6÷a2=a3
C.3a+5b=8abD.(—ab)3=-a3b3
7.
下列各式从左到右的变形是因式分解并正确的是( ).
A.B.
C.x2-xy+y2=(x-y)2D.2x-2y=2(x-y)
8.
下列四个图案中,是轴对称图形的是(  )
A.B.
C.D.
9.
等腰三角形一边长等于5,一边长等于9,则它的周长是()
A.14B.23C.19或23D.19
10.
十二边形的内角和是多少度(  )
A.900°B.1440°C.1800°D.1980°

2.选择题(共3题)

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 .

13.

    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)

14.
已知ama3a10,则m=_____.
15.
因式分解:3a2﹣27b2=_____.
17.
要使分式有意义,则的取值范围是
18.
在△ABC中,若∠A=80°,∠C=70°,则∠B=_____°,若∠A=100°,∠B=∠C,则∠C=_____°.

4.解答题(共6题)

19.
运用公式计算:
(1)102×98
(2)a3a3+(﹣2a32+(﹣a23
20.
分解因式:
(1)2m2﹣4mn+2n2
(2)ax﹣1)+bx﹣1)
21.
先化简,再求值:,其中
22.
解分式方程:
(1)
(2)=2+
23.
甲、乙二人做某种机械零件,已知甲每小时比乙多做5个,甲做100个所用的时间与乙做50个所用的时间相等.求甲、乙每小时各做多少个?
24.
如图,线段ABCD相交于点O,且互相平分.
求证:△AOC≌△BOD
试卷分析
  • 【1】题量占比

    单选题:(10道)

    选择题:(3道)

    填空题:(5道)

    解答题:(6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:1

    5星难题:0

    6星难题:11

    7星难题:0

    8星难题:3

    9星难题:6