题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042407-66137.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:根据完全平方公式展开等式左右两边即可得到答案.
等式左边
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042408-85562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042408-37631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042409-59395.png)
核心考点
举一反三
A -0.5 B. 0.5 C.-2 D.2
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042401-16932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042401-44077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042401-59052.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042354-94683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817042353-47464.png)
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