吉林省吉林市2018-2019学年八年级(上)期末数学试卷

适用年级:初二
试卷号:193065

试卷类型:期末
试卷考试时间:2019/1/18

1.选择题(共2题)

1.

短文改错。文中共有10处语言错误,每句中最多有两处。每处错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(﹨)划掉。

修改:在错的词下面画一横线,并在该词下面写出修改后的词。

注意:1). 每处错误及其修改均仅限一词;

2). 只允许修改10处,多者(从第11处起)不计分。

Dear Xiaohua,

    It is four days since mother recieves the operation. She is feeling much more better. The doctors told me the operation was successful, but because her old age she had to stay in hospital for other two weeks. The doctors also say it was quite necessary for him to do so. We expect to get a full report in two and three days. Please tell the good news to the rest of the family as soon as possible. You need't come here. I'm able to look at mother by myself. You can send some flower to her. She will feel very happily.

Yours,

Xiaohua

2.

短文改错。文中共有10处语言错误,每句中最多有两处。每处错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(﹨)划掉。

修改:在错的词下面画一横线,并在该词下面写出修改后的词。

注意:1). 每处错误及其修改均仅限一词;

2). 只允许修改10处,多者(从第11处起)不计分。

Dear Xiaohua,

    It is four days since mother recieves the operation. She is feeling much more better. The doctors told me the operation was successful, but because her old age she had to stay in hospital for other two weeks. The doctors also say it was quite necessary for him to do so. We expect to get a full report in two and three days. Please tell the good news to the rest of the family as soon as possible. You need't come here. I'm able to look at mother by myself. You can send some flower to her. She will feel very happily.

Yours,

Xiaohua

2.单选题(共4题)

3.
下列长度的三条线段能组成三角形的是(  )
A.3,4,8B.4,5,9
C.4,5,8D.3a,3a,6aa>0)
4.
如图所示.在△ABC中,∠BAC=106°,EFMN分别是ABAC的中垂线,ENBC上,则∠EAN=(  )
A.58°B.32°C.36°D.34°
5.
六边形的内角和为(  )
A.360°B.540°C.720°D.900°
6.
下列计算正确的是(  )
A.a3+a3=2a6B.a3•a2=a6C.a6÷a2=a3D.(a32=a6

3.填空题(共8题)

7.
已知x+y=8,xy=2,则x2y+xy2=_____.
8.
计算:a0b2=_____.
9.
x为_____时,分式的值为0.
10.
红细胞的平均直径为,将0.0000077用科学记数法表示为__________.
11.
点P(﹣2,4)关于x轴的对称点的坐标是
12.
如图,在RtABC中,∠C=90°,以点A为圆心,任意长为半径画弧,分别交ACAB于点MN,再分别以MN为圆心,任意长为半径画弧,两弧交于点O,作射线AOBC于点D,若CD=3,PAB上一动点,则PD的最小值为_____.
13.
如图,△ABC≌△ABC′,其中∠A=46°,∠B′=27°,则∠C=_____°.
14.
如图,四边形ABCD的对角线AC、BD相交于点O,△ABO≌△ADO.下列结论:

①AC⊥BD;
②CB=CD;
③△ABC≌△ADC;
④DA=DC.
其中所有正确结论的序号是____.

4.解答题(共9题)

15.
计算:
(1);(2)(6x4﹣8x3)÷(﹣2x2).
16.
如图1,将一个长为4a,宽为2b的长方形,沿图中虚线均分成4个长方形,然后按图2形状拼成一个正方形.

(1)图2中阴影部分的边长是 (用含ab的式子表示);
(2)若2a+b=7,且ab=3,求图2中阴影部分的面积;
(3)观察图2,用等式表示出(2ab2ab,(2a+b2的数量关系是
17.
分解因式:
(1)2ab+c)﹣3(b+c);(2)x2y﹣4y
18.
计算:
(1)(2x+3y2﹣(2x+y)(2xy);
(2)
19.
先化简,再求值:,其中a=2,b=
20.
解方程:
(1)
(2)
21.
如图,点C在线段AB上,ADEBACBEADBCCF平分∠DCE
求证:CFDE于点F
22.
如图①.在△ABC中,ABAC,∠ABC=60°,延长BA至点D,延长CB至点E,使BEAD,连接CDAE
(1)求证:△ACE≌△CBD
(2)如图②,延长EACD于点G,则∠CGE的度数是 度.
23.
在△ABC中,∠BAC=90°,ABAC,点D为直线BC上一动点(点D不与BC重合),以AD为直角边在AD右侧作等腰直角三角形ADE,且∠DAE=90°,连接CE

(1)如图①,当点D在线段BC上时:
BCCE的位置关系为
BCCDCE之间的数量关系为
(2)如图②,当点D在线段CB的延长线上时,结论①,②是否仍然成立?若不成立,请你写出正确结论,并给予证明.
(3)如图③,当点D在线段BC的延长线上时,BCCDCE之间的数量关系为
试卷分析
  • 【1】题量占比

    选择题:(2道)

    单选题:(4道)

    填空题:(8道)

    解答题:(9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:17

    7星难题:0

    8星难题:1

    9星难题:3