已知关于x的一元二次方程x2﹣mx+2m﹣1=0的两个实数根分别是x1、x2,且x12+x22=7,求m的值.
更新时间:2022-02-10 23:49:15
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适中
(0.65)
【推荐1】已知关于x的一元二次方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55bea821d60c6e16b3ac7992f6a3bdd.png)
(1)求证:方程总有两个实数根;
(2)若方程的两个实数根为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55bea821d60c6e16b3ac7992f6a3bdd.png)
(1)求证:方程总有两个实数根;
(2)若方程的两个实数根为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1924300a5d8e07d4e0fe51e47dc6f243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e86e6f0ac5903369afea2c8d04ba412.png)
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适中
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【推荐2】已知关于x的一元二次方程
.
(1)当方程有两个不相等的实数根时,求
的取值范围;
(2)若方程的两根分别为
,
,且满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e9490d2bb0f3f672eb3c116ec6b8e.png)
(1)当方程有两个不相等的实数根时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若方程的两根分别为
![](https://img.xkw.com/dksih/QBM/2019/10/21/2316955496701952/2318305451114496/STEM/e10e0755ff0f4e199c5fd8c1be1a8c67.png?resizew=17)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff1a0d5542d36d61291d2271210f70c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解答题-问答题
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适中
(0.65)
【推荐1】定义:在平面直角坐标系
中,若函数图象上的点
满足
(其中
,
为常数),则称点
为函数图象的“
级和点”.
(1)若点
为反比例函数
图象的“
级和点”,则
______ ,
______ ;
(2)若
时,直线
上有“
级和点”,求
的取值范围;
(3)若抛物线
的“
级和点”恰有一个,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd6e4185a3de5a361c4a87c62a770a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ebf9f9e6000eb9d82df1cb0d9da59e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d7c795bcba039d4f7a0703b78c3efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c341ce72e728eea664c25f541c4181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6cb67cdb696e397236056da2667433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知关于x的一元二次方程x2﹣2x+2m﹣1=0.
(1)当m=﹣1时,求此方程的根;
(2)若此方程有两个实数根,求m的取值范围.
(1)当m=﹣1时,求此方程的根;
(2)若此方程有两个实数根,求m的取值范围.
您最近一年使用:0次