青岛版2018-2019学年度八年级数学下册期末复习培优训练题2（附答案详解）
一、单选题
![](https://wkrtcs.bdimg.com/rtcs/image?w=193&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"193","h":"72","dataType":"png","c":"word/media/image1.png","imgOriW":193,"imgOriH":72})
1．如图，直线l上有三个正方形a，b，c，若a，c的面积分别为1和9，则b的面积为
A．8 B．9 C．10 D．11
2．不等式x﹣1≤1的解集在数轴上表示正确的是（）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=137&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"137","h":"29","dataType":"png","c":"word/media/image4.png","imgOriW":137,"imgOriH":29})
B．
C．![](https://wkrtcs.bdimg.com/rtcs/image?w=137&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"137","h":"30","dataType":"png","c":"word/media/image7.png","imgOriW":137,"imgOriH":30})
D．
3．一次函数y=x+2的图象不经过的象限是( )
A．第一象限 B．第二象限 C．第三象限 D．第四象限
4．在![](https://wkrtcs.bdimg.com/rtcs/image?w=15&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"15","h":"17","dataType":"png","c":"word/media/image9.png","imgOriW":31,"imgOriH":37})
，，，，，，，，，…（相邻两个之间的的个数逐次加）中，无理数有（ ） A． B． C． D．
![](https://wkrtcs.bdimg.com/rtcs/image?w=114&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"114","h":"71","dataType":"png","c":"word/media/image25.png","imgOriW":114,"imgOriH":71})
5．如图，将四根长度相等的细木条首尾相连，用钉子钉成四边形ABCD，转动这个四边形，使它形状改变，当AB=4，∠B=60°时，AC等于 （ ）
A．2![](https://wkrtcs.bdimg.com/rtcs/image?w=25&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"25","h":"23","dataType":"gif","c":"word/media/image26.png"})
B．4 C．2 D．4
6．“![](https://wkrtcs.bdimg.com/rtcs/image?w=10&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"10","h":"26","dataType":"png","c":"word/media/image28.png","imgOriW":21,"imgOriH":55})
的平方根是”，用数学式子可以表示为（ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=45&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"45","h":"29","dataType":"png","c":"word/media/image30.png","imgOriW":95,"imgOriH":60})
B． C． D．
7．下列图形中，既是轴对称图形，又是中心对称图形的是( )
![](https://wkrtcs.bdimg.com/rtcs/image?w=392&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"392","h":"113","dataType":"png","c":"word/media/image34.png","imgOriW":392,"imgOriH":113})
8．若![](https://wkrtcs.bdimg.com/rtcs/image?w=92&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"92","h":"19","dataType":"gif","c":"word/media/image35.png"})
，则下列式子正确的是（ ）
A．-a<-b B.![](https://wkrtcs.bdimg.com/rtcs/image?w=43&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"43","h":"41","dataType":"gif","c":"word/media/image36.png"})
C． D．
9．正比例函数![](https://wkrtcs.bdimg.com/rtcs/image?w=74&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"74","h":"17","dataType":"png","c":"word/media/image39.png","imgOriW":154,"imgOriH":37})
的函数值随的增大而增大，则一次函数的图象大致是（ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=53&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"53","h":"59","dataType":"png","c":"word/media/image43.png","imgOriW":120,"imgOriH":135})
B． C． D．
二、认真填一填：
10．如图，先将一张长方形的纸沿虚线对折，再对折，然后按图中虚线剪下，将剪下的纸①展开，一定可以得到一个菱形，其理论依据是_____．
![](https://wkrtcs.bdimg.com/rtcs/image?w=487&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"487","h":"88","dataType":"png","c":"word/media/image47.png","imgOriW":487,"imgOriH":88})
![](https://wkrtcs.bdimg.com/rtcs/image?w=167&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"167","h":"67","dataType":"png","c":"word/media/image48.png","imgOriW":231,"imgOriH":93})
11．以如图（以为圆心，半径为的半圆）作为“基本图形”，分别经历如下变换能得到图的有________．
①只要向右平移![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"7","h":"17","dataType":"png","c":"word/media/image21.png","imgOriW":15,"imgOriH":37})
个单位
②先以直线![](https://wkrtcs.bdimg.com/rtcs/image?w=19&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"19","h":"17","dataType":"png","c":"word/media/image52.png","imgOriW":41,"imgOriH":37})
为对称轴进行翻折，再向右平移个单位；
③先绕着点![](https://wkrtcs.bdimg.com/rtcs/image?w=10&md5sum=210c8dd7170a3b661f498bc29dbd4b6b&sign=142320ae4d&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=270&ipr={"t":"img","w":"10","h":"17","dataType":"png","c":"word/media/image50.png","imgOriW":22,"imgOriH":37})
旋转，再向右平移一个单位；④绕着的中点旋转即可．
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