解方程组
其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8736ab176bff8c3f7dd72551ecb1f53e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3083c1711ed6bee2a625938420914a.png)
17-18高三·北京·强基计划 查看更多[1]
更新时间:2023-04-06 17:14:38
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【知识点】 数与式
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【推荐2】已知二次函数
(a为常数).
(1)当
,
时,求
的值;
(2)当
时,二次函数
的最小值为
,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822e1d5acaa60803c97eec89a903183d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7f8363ae7e8fb0020856303ad61514.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a12a30935c79ae769818043a496f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822e1d5acaa60803c97eec89a903183d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
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