![](https://wkrtcs.bdimg.com/rtcs/image?w=42.666666666667&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"42.666666666667","h":"42.666666666667","dataType":"png","c":"word/media/image1.png","imgOriW":32,"imgOriH":32})
武清区2017—2018学年度第二学期期中练习卷
七年级数学参考答案及评分标准
一、选择题：
1.C； 2. A； 3. B； 4.C； 5. C； 6. C； 7.C； 8. B； 9. D； 10. D；11.A； 12. B.
二、填空题：
13.二； 14.答案不唯一，如![](https://wkrtcs.bdimg.com/rtcs/image?w=32&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"32","h":"24","dataType":"gif","c":"word/media/image10.png"})
； 15. 如果两个角是同一个角的余角，那么这两个角相等；16.70；17.；18..
三、解答题：
19.解：（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=177&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"177","h":"32","dataType":"gif","c":"word/media/image13.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=151&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"151","h":"23","dataType":"gif","c":"word/media/image14.png"})
……………………………………2分
=![](https://wkrtcs.bdimg.com/rtcs/image?w=48&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"48","h":"23","dataType":"gif","c":"word/media/image15.png"})
……………………………………4分
（2）![](https://wkrtcs.bdimg.com/rtcs/image?w=135&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"135","h":"47","dataType":"gif","c":"word/media/image16.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=83&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"83","h":"41","dataType":"gif","c":"word/media/image17.png"})
……………………………………2分
=![](https://wkrtcs.bdimg.com/rtcs/image?w=28&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"28","h":"41","dataType":"gif","c":"word/media/image18.png"})
……………………………………4分
20.（1）图略， ……………………………………4分
（2）图略，点![](https://wkrtcs.bdimg.com/rtcs/image?w=19&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"19","h":"23","dataType":"gif","c":"word/media/image19.png"})
（，），（，），（，）
……………………………………8分
21.解：由题意得![](https://wkrtcs.bdimg.com/rtcs/image?w=61&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"61","h":"19","dataType":"gif","c":"word/media/image26.png"})
且， ……………………………………2分
所以![](https://wkrtcs.bdimg.com/rtcs/image?w=39&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"39","h":"19","dataType":"gif","c":"word/media/image28.png"})
，则， ……………………………………4分
所以![](https://wkrtcs.bdimg.com/rtcs/image?w=77&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"77","h":"21","dataType":"gif","c":"word/media/image30.png"})
， ……………………………………6分
所以![](https://wkrtcs.bdimg.com/rtcs/image?w=45&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"45","h":"21","dataType":"gif","c":"word/media/image31.png"})
的平方根是 ……………………………………10分
22.解：（1）∵![](https://wkrtcs.bdimg.com/rtcs/image?w=71&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"71","h":"19","dataType":"gif","c":"word/media/image33.png"})
∴![](https://wkrtcs.bdimg.com/rtcs/image?w=184&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"184","h":"19","dataType":"gif","c":"word/media/image34.png"})
……………………2分
∵![](https://wkrtcs.bdimg.com/rtcs/image?w=59&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"59","h":"17","dataType":"gif","c":"word/media/image35.png"})
∴![](https://wkrtcs.bdimg.com/rtcs/image?w=123&md5sum=95857a19c36affe4678f498548374088&sign=b5e9315ae0&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=98&ipr={"t":"img","w":"123","h":"19","dataType":"gif","c":"word/media/image36.png"})
……………………4分
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