2018年辽宁省锦州市中考数学试卷
一、选择题（本大题共8小题，每小题2分，共16分.在每小题给出的四个选项中，只有一项是符合题目要求的）
1．（2分）下列实数为无理数的是（ ）
A．﹣5 B．![](https://wkrtcs.bdimg.com/rtcs/image?w=13.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"13.00","h":"35.00","dataType":"png","c":"word/media/image1.png","imgOriW":13,"imgOriH":35})
C．0 D．π
2．（2分）如图，这是由5个大小相同的正方体搭成的几何体，该几何体的左视图（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=103.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"103.00","h":"105.00","dataType":"png","c":"word/media/image2.png","imgOriW":103,"imgOriH":105})
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=63.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"63.00","h":"63.00","dataType":"png","c":"word/media/image3.png","imgOriW":63,"imgOriH":63})
B． C． D．
3．（2分）一元二次方程2x2﹣x+1=0根的情况是（ ）
A．两个不相等的实数根 B．两个相等的实数根
C．没有实数根 D．无法判断
4．（2分）为迎接中考体育加试，小刚和小亮分别统计了自己最近10次跳绳成绩，下列统计中能用来比较两人成绩稳定程度的是（ ）
A．平均数 B．中位数 C．众数 D．方差
5．（2分）如图，直线l1∥l2，且分别与直线l交于C，D两点，把一块含30°角的三角尺按如图所示的位置摆放，若∠1=52°，则∠2的度数为（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=189.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"189.00","h":"95.00","dataType":"png","c":"word/media/image7.png","imgOriW":189,"imgOriH":95})
A．92° B．98° C．102° D．108°
6．（2分）下列运算正确的是（ ）
A．7a﹣a=6 B．a2•a3=a5 C．（a3）3=a6 D．（ab）4=ab4
7．（2分）如图，在△ABC中，∠ACB=90°，过B，C两点的⊙O交AC于点D，交AB于点E，连接EO并延长交⊙O于点F，连接BF，CF，若∠EDC=135°，CF=2![](https://wkrtcs.bdimg.com/rtcs/image?w=20.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"20.00","h":"18.00","dataType":"png","c":"word/media/image8.png","imgOriW":20,"imgOriH":18})
，则AE2+BE2的值为（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=144.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"144.00","h":"139.00","dataType":"png","c":"word/media/image9.png","imgOriW":144,"imgOriH":139})
A．8 B．12 C．16 D．20
8．（2分）如图，在△ABC中，∠C=90°，AC=BC=3cm，动点P从点A出发，以![](https://wkrtcs.bdimg.com/rtcs/image?w=20.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"20.00","h":"18.00","dataType":"png","c":"word/media/image10.png","imgOriW":20,"imgOriH":18})
cm/s的速度沿AB方向运动到点B，动点Q同时从点A出发，以1cm/s的速度沿折线AC→CB方向运动到点B．设△APQ的面积为y（cm2），运动时间为x（s），则下列图象能反映y与x之间关系的是（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=178.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"178.00","h":"111.00","dataType":"png","c":"word/media/image11.png","imgOriW":178,"imgOriH":111})
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=102.00&md5sum=7fc7ac0afde217f20dcdf4a9399b956f&sign=2597c5b104&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=638&ipr={"t":"img","r":"r_4","w":"102.00","h":"105.00","dataType":"png","c":"word/media/image12.png","imgOriW":102,"imgOriH":105})
B． C． D．
二、填空题（本大题共8小题，每小题3分，共24分）
9．（3分）因式分解：x3﹣4x= ．
10．（3分）上海合作组织青岛峰会期间，为推进“一带一路”建设，中国决定在上海合作组织银行联合体框架内，设立300亿元人民币等值专项贷款，将300亿元用科学记数法表示为 元．
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