四川省雅安市2018-2019学年七年级下学期期末数学试题

适用年级:初一
试卷号:198728

试卷类型:期末
试卷考试时间:2019/8/17

1.单选题(共11题)

1.
计算的结果是( )
A. B. C. D.
2.
已知,则( )
A. 0 B. -4 C. 4   D. 8
3.
按一定规律排列的一列数:,…,若依次表示这列数中的连续三个数,猜想满足的关系式是( )
A. B. C. D.
4.
若x²+mx+36是完全平方式,则m的值为
A.6B.±6C.12D.±12
5.
甲,乙两人以相同路线前往距离单位10的培训中心参加学习.图中分别表示甲,乙两人前往目的地所走的路程s随时间(分)变化的函数图象.以下说法:①乙比甲提前12分钟到达;②甲的平均速度为15千米/小时;③乙走了8后遇到甲;④乙出发6分钟后追上甲.其中正确的有()

A. 4个 B. 3个 C. 2个 D. 1个
6.
如图,四边形中,点延长线上,则下列条件中不能判断的是( )
A.B.
C.D.
7.
如图是用直尺和圆规作一个角等于已知角,那么能得出的依据是运用全等三角形判定( )
A.边边边B.边角边C.角边角D.角角边
8.
如图,在中,平分平分的外角,则( )
A.B.C.D.
9.
如图2,分别表示△ABC的三边长,则下面与△ABC一定全等的三角形是
A.B.C.D.
10.
下列运算中,正确的是(    )
A.  B.C.D.
11.
下列图形中是轴对称图形的有
A.1个B.2个C.3个D.4个

2.选择题(共1题)

12.阅读下面短文,从短文后各题所给的四个选项(A、 B 、C 、D)中,选出可以填入空白处的最佳选项。

    Annie, my neighbor's daughter, was away for her first term at college this year. She is a very sweet girl but just a bit shy. When her birthday month 1, I found out she was feeling a bit blue and 2.

    Her family is quite 3 and finances are tight, so there wouldn't be any birthday visitors.

    I wanted to send her a card and maybe a small gift to 4 her up. I got her school address from her mom and planned to 5 send her something. Then I got a(n) 6!  I thought perhaps I could give her a big 7. I bought some balloons, birthday hats and other small novelties (新奇玩意) at a one-dollar 8.  I took a small 9 and asked three other people in my area to sing Happy Birthday and send some birthday 10 to her. Other people found out 11 we were doing and added their voices, 12 it really sounded like we had a party 13 .

    Then I bought her a small present and a card as 14 originally. The real fun was 15 it to be sent. I arranged everything specially so it was like opening a birthday present!

    At the last minute, I added a pack of small cakes and a box of birthday 16 before sending it off. 

    I got a call a few days later. Annie said her roommate and one of her neighbors in her school got together with her and held the party for her once it arrived. She sounded so 17 and I was so glad that she had some friends to 18 her special day with her.

    It was such an easy and fun thing to do. The people who helped me make the tape still laughed and talked about the 19 experience. And Annie told me it was the most fun birthday she can 20!

3.填空题(共5题)

13.
已知:,且,则的值是__________.
14.
一个长方形的面积是25﹣4y2,它的一条边长为5+2y,则它的周长是_____.
15.
如图,在中,的垂直平分线,,则的周长为______
16.
计算:= .
17.
如图a是长方形纸带,∠DEF=26°,将纸带沿EF折叠成图b,再沿BF折叠成图c,则图c中的∠CFE的度数是 .

4.解答题(共6题)

18.
(1)化简:计算:
(2)先化简,再求值:,其中.
19.
在边长为a的正方形中减掉一个边长为b的小正方形(a>b)把余下的部分再剪拼成一个长方形.

(1)如图1,阴影部分的面积是:
(2)如图2,是把图1重新剪拼成的一个长方形,阴影部分的面积是
(3)比较两阴影部分面积,可以得到一个公式是
(4)运用你所得到的公式,计算:99.8×100.2.
20.
机动车出发前油箱内有42升油,行驶若干小时后,途中在加油站加油若干升.油箱中余油量(升)与行驶时间(小时)之间的关系如图所示,根据下图回答问题:

(1)机动车行驶几小时后加油?加了多少油?
(2)试求加油前油箱余油量与行驶时间之间的关系式;
(3)如果加油站离目的地还有350千米,车速为60千米/小时,照这样行驶,要到达目的地,油箱中的油是否够用?请说明理由.
21.
如图,中,,以为边在外作等边三角形,过点的垂线,垂足为,与相交于点,连接.

(1)说明:
(2)若是直线上的一点.则当在何处时,最小,并求此时的值.
22.
如图,已知点在一条直线上,

(1)求证:
(2)若,求的长.
23.
如图,在中,是高,点分别在上且,试判断的位置关系,并说明理由.
试卷分析
  • 【1】题量占比

    单选题:(11道)

    选择题:(1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:13

    7星难题:0

    8星难题:4

    9星难题:4