已知
,求
各自的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5f1fd95a3ddbfce7328f51a1acb506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd40858cfd6b17bfd930dad0dea04948.png)
更新时间:2022-12-08 21:19:31
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【知识点】 利用不等式求值或取值范围解读
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解答题-问答题
|
较易
(0.85)
真题
【推荐1】已知关于x的实系数二次方程
有两个实数根α,β.证明:
(1)如果
,
,那么
且
;
(2)如果
且
,那么
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1146110d4382c714c10de00dd1273b7f.png)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e87f22873df7e1305a5457e609743d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07736e38f0e5ae957fac1be0abb8d05e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43db66dd811f63a51c94b57ee810a3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c4fd7de2beee93070f06d1d2379ce4.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43db66dd811f63a51c94b57ee810a3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c4fd7de2beee93070f06d1d2379ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e87f22873df7e1305a5457e609743d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07736e38f0e5ae957fac1be0abb8d05e.png)
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