湖南省张家界市永定区2018-2019学年八年级上学期期中考试数学试题

适用年级:初二
试卷号:204249

试卷类型:期中
试卷考试时间:2018/11/25

1.单选题(共10题)

1.
如果分式有意义,则x的取值范围是(    )
A.全体实数B.x≠-1C.x≠1D.x>1
2.
下列变形从左到右一定正确的是(   )
A.B.C.D.
3.
关于x的方程无解,则m的值为(  )
A.﹣5B.﹣8C.﹣2D.5
4.
以下各组线段为边,能组成三角形的是(    )
A.8cm,6cm,4cmB.2cm,4cm,6cm
C.14cm,6cm,7cmD.2cm,3cm,6cm
5.
如图,锐角三角形ABC中,直线lBC的中垂线,直线m为∠ABC的角平分线,lm相交于P点.若∠A=60°,∠ACP=24°,则∠ABP的度数为(    )
A.24°B.31°C.32°D.34°
6.
如图,已知MB=ND,∠MBA=∠NDC,下列条件中不能判定△ABM≌△CDN的是(  )
A.∠M=∠NB.AM=CNC.AB=CDD.AM∥CN
7.
下列三角形中:①有两个角等于60°的三角形;②有一个角等于60°的等腰三角形;③三个角都相等的三角形;④三边都相等的三角形.其中是等边三角形的有(    )
A.①②③B.①②④C.①③④D.①②③④
8.
下列运算正确的是(  )
A.a2+a3=2a5B.a6÷a2=a3
C.a2a3=a5D.(2ab23=6a3b6
9.
如图,已知MB=ND,∠MBA=∠NDC,下列哪个条件不能判定△ABM≌△CDN(    ) 
A.AM=CN B.AB=CDC.AM∥CN   D.∠M=∠N
10.
以下列各组线段为边,能组成三角形的是(   )
A.2cm,4cm,6cmB.8cm,6cm,4cm
C.14cm,6cm,7cmD.2cm,3cm,6cm

2.选择题(共2题)

11.

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

12.

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

3.填空题(共5题)

13.
已知=2,则的值等于________.
14.
红细胞的平均直径为,将0.0000077用科学记数法表示为__________.
15.
如图,在△ABC中,∠A=50°,∠C=70°,则外角∠ABD的度数是____________ .
16.
如图,△ABC中,AB=AC,∠BAC=124°,ADBC边上的中线,且BD=BE,则∠ADE是_____度.
17.
若x+4y=-1,则2x•16y的值为_____.

4.解答题(共9题)

18.
计算:-(-1)2018- (π-3.14)0.
19.
A÷.
(1)化简A
(2)当a=3时,记此时A的值为f(3);当a=4时,记此时A的值为f(4)……解关于x的不等式: -f(4)+f(5)+…+f(15).
20.
先化简,再在1,2,3中选取一个适当的数代入求值.
21.
解方程:
22.
某中学组织学生去离学校15km的农场,先遣队与大队同时出发,先遣队的速度是大队的速度的1.2倍,结果先遣队比大队早到0.5h,先遣队和大队的速度各是多少?
23.
如图,在△ABC中,∠A=56°,∠ABD=30°,∠ACB=70°,且CE平分∠ACB,求∠DEC的度数.
24.
如图,△ACB和△ECD都是等腰直角三角形,∠ACB=∠DCE=90°.
(1)求证:BD=AE;
(2)若△ACB不动,把△DCE绕点C旋转到使点D落在AB边上,如图2所示,问上述结论还成立吗?若成立,给予证明.
25.
如图,∠B=∠D,DEACBFACEF是垂足,.
求证:(1);(2)
26.
已知:如图,ABCDDEACBFACEF是垂足,
求证:(1);(2)
试卷分析
  • 【1】题量占比

    单选题:(10道)

    选择题:(2道)

    填空题:(5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:18

    7星难题:0

    8星难题:0

    9星难题:6