河南省平顶山市宝丰县2017-2018学年八年级(下)期末数学试题

适用年级:初二
试卷号:192883

试卷类型:期末
试卷考试时间:2019/3/16

1.单选题(共8题)

1.
多项式a2-9与a2-3a的公因式是(  )
A.a+3B.a-3C.a+1D.a-1
2.
某工厂接到加工600件衣服的订单,预计每天做25件,正好按时完成,后因客户要求提前3天交货,工人则需要提高每天的工作效率,设工人每天应多做x件,依题意列方程正确的是(  )
A.B.
C.D.
3.
不等式组的解集在数轴上表示为()
A.
B.
C.
D.
4.
若平行四边形的一边长为7,则它的两条对角线长可以是(  )
A.12和2B.3和4C.14和16D.4和8
5.
如图,在△ABC中,AB=AC,点D是边AC上一点,BC=BD=AD,则∠A的大小是(   ).
A.36°B.54°C.72°D.30°
6.
已知直角三角形两直角边的边长之和为,斜边长为2,则这个三角形的面积是(  )
A.0.25B.0.5C.1D.2
7.
如果9x2+kx+25是一个完全平方式,那么k的值是(   )
A.15B.±5
C.30D.±30
8.
如图,在▱ABCD中,对角线AC的垂直平分线分别交AD、BC于点E、F,连接CE,若△CED的周长为6,则▱ABCD的周长为(  )
A.6B.12C.18D.24

2.选择题(共1题)

9.

根据短文理解选择正确答案。

      Everyone needs friends. Friends bring us happiness and hope in our lives. But the ability to make friends changes from person to person. To some people, making friends is easy, and to others it's very difficult.

      Making friends is a skill, and the first thing is to know how to get on with others.

      If you have trouble in making friends, maybe I can tell you how to do it.

      ★Realize your own good points. You have skills and talents(才能) that others will like.

      ★ Believe that you are a good person and have something nice to share with others.

      ★ Be humourous. Learn to laugh at yourself and your weakness. Remember to smile at others.

      ★ Respect(尊敬) others. Everyone has his own idea. Learn how to listen to others’ ideas without trying to make them accept(接受) yours.

      ★ Be kind. If you are kind to others, they will usually be kind to you. There are hundreds of little things you can do to show your kindness. Open the door for someone. Wave to a friend and so on.

      ★  Don't complain(抱怨). Learn to accept what you can't change, and work hard to change what you can. No one is willing to hear your complaints all the time.

      ★ Never give up. Even if you are faced with some closed-minded people, never give up. And try to find someone who will understand you.

3.填空题(共3题)

10.
分解因式___________
11.
不等式组的解集是_____.
12.
如图,ABC三点在同一条直线上,∠A=50°,BD垂直平分AE,垂足为D,则∠EBC的度数为_____.

4.解答题(共6题)

13.
分解因式:
(1)x2+y2+2xy﹣1
(2)4(ab2﹣(a+b2
14.
先化简,再求值:÷,其中x=2.
15.
(10分) 铭润超市用5000元购进一批新品种的苹果进行试销,由于销售状况良好,超市又调拨11000元资金购进该品种苹果,但这次的进货价比试销时每千克多了0.5元,购进苹果数量是试销时的2倍.
(1)试销时该品种苹果的进货价是每千克多少元?
(2)如果超市将该品种苹果按每千克7元的定价出售,当大部分苹果售出后,余下的400千克按定价的七折(“七折”即定价的70%)售完,那么超市在这两次苹果销售中共盈利多少元?
16.
解不等式(组):
(1)x﹣(3x﹣1)≤x+2
(2)
17.
如图,在四边形BCDE中,∠C=∠BED=90°,∠B=60°,延长CD、BE,两线相交于点A,已知CD=2,DE=1,求Rt△ABC的面积.
18.
如图,平行四边形ABCD中,∠ABC=60°,点EF分别在CDBC的延长线上,AEBDEFBF,垂足为点FDF=2.
(1)求证:DEC中点;
(2)求EF的长.
试卷分析
  • 【1】题量占比

    单选题:(8道)

    选择题:(1道)

    填空题:(3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:6

    7星难题:0

    8星难题:3

    9星难题:7