已知二次函数
,非空集合
.
(1)当
时,二次函数的最小值为-1,最大值为3求实数a的取值范围;
(2)当______时,求二次函数
的最值以及取到最值时x的取值.在①
,②
,③
,这三个条件中任选一个补充在(2)问中的横线上,并求解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7215124081342ba1d78c39b2c98d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa9f79d16a3717c28a2b25bf65f02e0.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
(2)当______时,求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c74228a31c6f3ad595e98ae52755ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
更新时间:2021-11-17 18:11:00
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名校
【推荐1】已知二次函数
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(1)若函数在区间
上存在零点,求实数q的取值范围;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e375ea35453712f6f5a7cf315bd463f.png)
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解题方法
【推荐2】对于函数
,存在实数
,使
成立,则称
为
关于参数m的不动点.
(1)当
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(2)当
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时,函数
在
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(3)对于任意的
,总存在
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)的两个相异的不动点,试求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ac8afb8d3acab3ad65d18be3c5c5549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d615705178eb49875e3d252892ab0a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06408895febc126c2ae409e807349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71bb7883ea87e6275472dbe14ee62357.png)
(3)对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2143a6cfd3526c4f5795328baa51b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca067206ac6262c3ae24bb259de6ea6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17bda892497cea43df67db57b4e2a07a.png)
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解题方法
【推荐1】(1)若关于
的方程
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3351f77162c004c9c21ac24c42e0413e.png)
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【推荐2】(1)已知函数
在区间[-1,2]上最大值为4,求实数a的值;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54839d84e0efa0b0e580ede4ce06fa0.png)
(2)已知函数
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