2014-2015学年江苏省苏州市景范中学八年级（上）期中数学试卷
一、选择题（共8小题，每小题2分，满分16分）
1．（2分）下面的图形中，不是轴对称图形的是（ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=74&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"74","h":"69","dataType":"png","c":"word/media/image1.png","imgOriW":74,"imgOriH":69})
B． C． D．
2．（2分）下列计算正确的是（ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=64&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"64","h":"37","dataType":"png","c":"word/media/image5.png","imgOriW":64,"imgOriH":37})
B． C． D．
3．（2分）如果把![](https://wkrtcs.bdimg.com/rtcs/image?w=29&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"29","h":"36","dataType":"png","c":"word/media/image9.png","imgOriW":29,"imgOriH":36})
的x与y都扩大10倍，那么这个代数式的值（ ）
A．不变 B．扩大50倍
C．扩大10倍 D．缩小到原来的![](https://wkrtcs.bdimg.com/rtcs/image?w=21&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"21","h":"35","dataType":"png","c":"word/media/image10.png","imgOriW":21,"imgOriH":35})
4．（2分）设![](https://wkrtcs.bdimg.com/rtcs/image?w=64&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"64","h":"18","dataType":"png","c":"word/media/image11.png","imgOriW":64,"imgOriH":18})
，a在两个相邻整数之间，则这两个整数是（ ）
A．1和2 B．2和3 C．3和4 D．4和5
5．（2分）如图，DE是△ABC中边AC的垂直平分线，若BC=18cm，AB=10cm，则△ABD的周长为（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=192&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"192","h":"104","dataType":"png","c":"word/media/image12.png","imgOriW":192,"imgOriH":104})
A．16 cm B．28 cm C．26 cm D．18 cm
6．（2分）如图，△ABC内有一点D，且DA=DB=DC，若∠DAB=20°，∠DAC=30°，则∠BDC的大小是（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=94&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"94","h":"116","dataType":"png","c":"word/media/image13.png","imgOriW":94,"imgOriH":116})
A．100° B．80° C．70° D．50°
7．（2分）如图所示，已知△ABC中，AB=6，AC=9，AD⊥BC于D，M为AD上任一点，则 MC2﹣MB2等于（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=144&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"144","h":"102","dataType":"png","c":"word/media/image14.png","imgOriW":144,"imgOriH":102})
A．9 B．35 C．45 D．无法计算
8．（2分）已知：如图在△ABC，△ADE中，∠BAC=∠DAE=90°，AB=AC，AD=AE，点C，D，E三点在同一条直线上，连接BD，BE．以下四个结论：
①BD=CE；
②BD⊥CE；
③∠ACE+∠DBC=45°；
④BE2=2（AD2+AB2），
其中结论正确的个数是（ ）
![](https://wkrtcs.bdimg.com/rtcs/image?w=123&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"123","h":"127","dataType":"png","c":"word/media/image15.png","imgOriW":123,"imgOriH":127})
A．1 B．2 C．3 D．4
二、填空题（共10小题，每小题2分，满分20分）
9．（2分）![](https://wkrtcs.bdimg.com/rtcs/image?w=21&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"21","h":"35","dataType":"png","c":"word/media/image16.png","imgOriW":21,"imgOriH":35})
的算术平方根是 ，﹣64的立方根是 ．
10．（2分）已知分式![](https://wkrtcs.bdimg.com/rtcs/image?w=64&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"64","h":"41","dataType":"png","c":"word/media/image17.png","imgOriW":64,"imgOriH":41})
，当x=2时，分式无意义，则a= ．
11．（2分）5.6048（保留三个有效数字） ，近似数7.02×105精确到 位．
12．（2分）已知![](https://wkrtcs.bdimg.com/rtcs/image?w=59&md5sum=18c8032d9d34dc8eb938f485b8dded7e&sign=1b997bc0f9&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=102&ipr={"t":"img","w":"59","h":"36","dataType":"png","c":"word/media/image18.png","imgOriW":59,"imgOriH":36})
，则= ．
13．（2分）若等腰三角形的一个外角是110°，则其底角为 ．
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