![](https://wkrtcs.bdimg.com/rtcs/image?w=262.37&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","r":"r_7","w":"262.37","h":"43.62","dataType":"jpeg","c":"word/media/image1.jpeg","imgOriW":820,"imgOriH":137})
知能演练提升
![](https://wkrtcs.bdimg.com/rtcs/image?w=35.53&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","r":"r_9","w":"35.53","h":"15.34","dataType":"jpeg","c":"word/media/image2.jpeg","imgOriW":111,"imgOriH":48})
能力提升
1.(2018·浙江杭州中考)下列计算正确的是( )
A.![](https://wkrtcs.bdimg.com/rtcs/image?w=35&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"35","h":"34","c":"4de0c338673c3e700d282eadc6e2fdae.png"})
C.![](https://wkrtcs.bdimg.com/rtcs/image?w=36&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"36","h":"34","c":"d6c43b635f9e278784e6cf06d0c9c2b4.png"})
2.a2的算术平方根一定是( )
A.a B.|a| C.![](https://wkrtcs.bdimg.com/rtcs/image?w=26&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"26","h":"29","c":"c17e049691f2eb2d93102b7d4b309572.png"})
3.与![](https://wkrtcs.bdimg.com/rtcs/image?w=39&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"39","h":"29","c":"8932ad6bd279127618cd620c44a8deff.png"})
A.1和2 B.2和3 C.3和4 D.4和5
4.比较大小:![](https://wkrtcs.bdimg.com/rtcs/image?w=39&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"39","h":"29","c":"49d66b49a2741e5b36e82bc1a9d6a14b.png"})
5.(2018·河北中考)计算:![](https://wkrtcs.bdimg.com/rtcs/image?w=49&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"49","h":"54","c":"f85e191d9412d4d8528220390bbef5d4.png"})
6.若|x+2|与![](https://wkrtcs.bdimg.com/rtcs/image?w=47&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"47","h":"29","c":"5ca0c28efb95542aaf50681619064299.png"})
创新应用
★7.已知7+![](https://wkrtcs.bdimg.com/rtcs/image?w=39&md5sum=93f62adf4fd1119c9083a913987dc8e3&sign=b5fde84569&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=175&ipr={"t":"img","w":"39","h":"29","c":"99007f9259f3528aecc38716b2b14680.png"})
答案：
能力提升
1.A 2.B 3.C 4.> 5.2
6.-6 由题意,得|x+2|+
又因为|x+2|≥0,且负数没有算术平方根,
即y-3≥0,所以x+2=0,y-3=0,
解得x=-2,y=3.
故xy=(-2)×3=-6.
创新应用
7.分析m=
解∵4<
∴11<7+
∴m=7+
∵-5<-
∴6<11-
∴n=11-
∴m+n=
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