题目
题型:解答题难度:一般来源:湖北省期末题
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041201-84836.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041201-33821.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041202-26307.png)
=(4
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041202-11846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041202-20504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041202-47942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041202-35532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041203-46432.png)
=8
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041203-50545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041203-10683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041203-90909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041203-63823.png)
=8
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041204-55815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041204-45287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041204-61079.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041204-50564.png)
由①得y=8﹣3x,③
将③代入②得 4x﹣2(8﹣3x)=5,
化简得10x=21,
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041205-92016.png)
将上式代入③得
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041205-46623.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041205-98398.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041159-49462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041200-62794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041158-84705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041158-78777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041158-55132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041156-49471.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041156-83577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041152-72533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041152-25814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041152-90108.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041152-91177.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041152-58809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041153-10350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041153-26198.png)
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