题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001123-72365.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001123-50510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-29795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-24474.png)
解析
试题分析:(1)把二次根式化简及绝对值符号去掉,再合并同类二次根式即可得出答案;
(2)把常数项-1移到等号右边,方程两边都加上一次项系数-2的一半的平方,即可配方求出方程的解。
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001123-72365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-26156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-25660.png)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-73409.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001125-51362.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001125-49791.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001125-18218.png)
解得:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-29795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001124-24474.png)
考点: 1.二次根式的混合运算;2.解一元二次方程――配方法.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001122-67126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001122-67126.png)
A. 4
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001122-67126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001122-67126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001122-67126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001122-67126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001121-49830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001121-85490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001117-32421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001117-15915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001117-97018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001116-39985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001116-53810.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821001113-54817.png)
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