题目
题型:解答题难度:一般来源:山东省期末题
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025720-82230.png)
(2)解方程组:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025720-88821.png)
(3)求下列式中的x值:27x3﹣512=0.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025720-97139.png)
=4
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025720-18918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025720-28133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025721-66051.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025721-91702.png)
(2)解方程组:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025721-54996.png)
①×2-②得:5x=-21,x=﹣
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025721-10138.png)
把它代入②得:y=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025721-88735.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025722-27829.png)
(3)27x3﹣512=0,
x3=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025722-23523.png)
x=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025722-13256.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025717-41001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025717-25320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025717-36230.png)
(2)(x﹣1)2﹣(x+2)(x﹣2).
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025705-18900.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025705-25860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025703-76375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025657-83681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025657-19338.png)
(2)先化简,再求值:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821025658-69500.png)
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