设
,
是关于
的一元二次方程
的两实根,
的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040135d64192de075ba0cc9f11ddbc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa33c2bd791339d32821077846605d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebeb1689d94b1f05dc8ef6b21bed34e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cff8527568e89210bf0be2e9964c1e9.png)
更新时间:2018-11-03 12:35:55
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【知识点】 一元二次方程的根与系数的关系解读
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(0.65)
【推荐1】关于
的一元二次方程
有两个不等实根
,
,若方程两实根
,
满足
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997c184b2509054df7ff3fb182f9d441.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知:抛物线
与直线
有两个不同的交点,若两个交点的横坐标是分别为
、
,若
,则
的取值范围是 ____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8964683cd93994894298932540f6db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b0d498b4c84030612dd235c4547736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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