题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-65186.png)
其中
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-36837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-57627.png)
答案
解析
试题分析:先去括号,再合并同类项,然后根据倒数、相反数的定义求得
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-36837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-57627.png)
由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-98198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-39028.png)
原式=
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053341-34595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053341-73345.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-98198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053340-39028.png)
原式=
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053341-13723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053341-45956.png)
点评:解答本题的关键是熟练掌握在去括号时,若括号前是“-”号,把括号和括号前的“-”号去掉后,括号里各项的符号均要改变.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053333-32549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-14108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-51301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-94851.png)
![]() ![]() | 当![]() ![]() | 当![]() ![]() | 当![]() ![]() |
![]() | | | |
![]() | | | |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053333-32549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-14108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-51301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-94851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-92765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-89459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-51301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053334-94851.png)
A.0.4![]() ![]() | B.2![]() ![]() | C.13与![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053327-56693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053328-15560.png)
A.2x-3 | B.2x+3 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053322-98833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817053322-22840.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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