已知一元二次方程
的两根分别是
,求下列各式的值.
(1)
;
(2)
;
(3)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33480a077b3a133afc87c7c8d1c7e4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694c99143dcd6fdc8138efa03d0c3350.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3a2117639ee0238b78ae5f1b1902fe.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2edf5f862dba663e2f4c41d880817b7.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0555901ab5d48e92ad94c3d985d1199d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9d66fe334930d0c7312a9cbea200e5.png)
更新时间:2022-10-25 05:34:16
|
【知识点】 一元二次方程的解集及其根与系数的关系
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解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】已知不等式
的解集是
.
(I)求
的值;
(II)若不等式
在
上恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf10af9b8f67c9dedf7d041c1f24593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7933994f096156cc5fece54ad69ac6.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(II)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1250b7d3e10798979b82e1d20d6d1673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】已知
,
是方程
的两个实数根,且
.
(1)求k的取值.
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3e576a7b0ad9f8eec25d017f123a344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7efd1a1f37a7c503305754f77e4ce59.png)
(1)求k的取值.
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897c40b28987be54350e95087c4c9fc.png)
您最近一年使用:0次