对某一个函数给出如下定义:对于函数y,若当
,函数值y满足
,且满足
,则称此函数为“k型闭函数” .例如:正比例函数
,当
时,
,则
,求得:
,所以函数
为“3型闭函数” .已知二次函数
,当
时,y是“k型闭函数”,则k的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcb50f155690f7d2f67c72eac4638be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30ef282faeb29715cc49d5e8fff130a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6feb617d9a98901d127d14cbe7dc381d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a2b4c212450b2a0f77e042c8da13dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00879cffccc124857ca755a8c345e45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a145aec773f46a294887da1f9d140e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907df17c41d7573c6a40af495d342854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e788c32187ae2cc97aaa24da1d40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a2b4c212450b2a0f77e042c8da13dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfa51ce90c71c6a04f2e3b022df30fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6343069217cd6d8dd32446da428dae46.png)
A.![]() | B.![]() | C.![]() | D.![]() |
19-20九年级下·山东济南·自主招生 查看更多[3]
更新时间:2022-04-12 08:14:12
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【推荐1】二次函数
的图象如图所示,给出下列结论:①
;②
;③若
,则
;④
,其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbc6fbdb7a42c4f3f63ce6424e2eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1cebb6878f178099c3ccba6761586b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96be88a97e450e79fd5bf2a15b79ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd92efffc6a8aa1a9d39a8c401b3e6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/9de1d49b-e6d2-4f07-aaa3-99b7f65b0ee8.png?resizew=159)
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【推荐2】抛物线
与
轴相交于
、
两点,其顶点为
,将此抛物线在
轴下方的部分沿
轴翻折,其余部分保持不变,如图得到一个新的图象.现有直线
与该新图象有四个交点,则
的取值范围为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/17007499-298a-4a68-8c50-83d302303dd0.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c5cef6b5c94c80589edfe2bf44eaa95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a4a7f7496bf126a583563799a43f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/17007499-298a-4a68-8c50-83d302303dd0.png?resizew=160)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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【推荐1】在平面直角坐标系xOy中,已知抛物线
与x轴交于A、B两点,与y轴交于C点,D为抛物线顶点.连接AD交y轴于点E,点P在第四象限的抛物线上,连接
交于点G,设
,则w的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92738aadeac1e3d3d8e919772bce727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e9117a7f79d043c53779a05848b8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65002efa11aafdca70ddcad0fd652d5b.png)
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【推荐2】已知点
在二次函数
的图象上,其中
,令
.
为
的个位数字(
为正整数),下列说法:①
;②
的最小值为
,此时
;③
的个位数字为8.其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4817b1336de838f3063ab785d4856df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5109eb35b9c16fc5e128198a1819a44c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c70c1f2e3c45beb318d73b0fc4b3e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053e0ac90a531ac20182007917715c26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b1672953164c806fee8e7d6d8336c8.png)
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