名校
1 . 设关于
的一元二次方程
有两个实根
.
(1)若
,求
的值;
(2)求证:
且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f671efb56b261328c1bc718c27242484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5b86123575c8414b9302f926fc7208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d508baa75ae70388bc437d9d9cc71730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dde2c78809169c5aa426bd451e68687.png)
您最近一年使用:0次
名校
2 . 若
,求证:方程
和方程
至少有一个方程有实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a230c15e01a14f455aa00881bcbfa382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98da87fb23c0c8463af422c812ffd074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/908bd80e2402adcb48a96e7ce59be98c.png)
您最近一年使用:0次