题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-80420.png)
A.2![]() | B.2![]() |
C.2-![]() | D.2 -2![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
∴C点所表示的数是x=1-(
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
根据绝对值的意义进行化简:
原式=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
=2
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014907-47808.png)
故选A
核心考点
试题【.如图,数轴上1与,对应的点分别为A,B,点B关于点A的对称点为C,设点C表示的数为x,则|x-|=( ▲ )A.2-2B.2-1C.2-D.2 -2】;主要考察你对二次根式加减等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014903-87968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014903-87952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014859-47789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-97130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-97130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-97130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-84430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-36348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-36348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-36348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-80742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-97130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-97303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014900-36348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014901-11916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014901-16095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014901-73539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014901-75836.png)
▲ 。
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014858-79205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014858-63249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014851-96415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014852-52814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014852-48508.png)
A4:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014852-86849.png)
(1)请观察A1,A2,A3的规律,按照规律完成填空.
(2)比较大小A1和A2
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014852-77853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014852-79385.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-59951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-78052.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-90570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-58489.png)
(3)同理,我们可以比较出以下代数式的大小:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-52457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-90570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014853-69881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014852-86849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014854-83354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014854-68165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821014849-87549.png)
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