如图,在平面直角坐标系中,抛物线
(
)与
轴交于点
,顶点坐标为
,与
轴的交点在
,
之间(包合端点),下列结论:①
;②
;③关于
的方程
没有实数根,其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/3/30/2688810050207744/2697638117400576/STEM/e2724d74-7a8c-46c9-8051-5213716f1547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bac94908f9f24ef1618a72cece5cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ae1b361135eaae8d172cb7aa490d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8239c39dc664ec10c05f69f2d7a98f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd75ed928363b9e76664c9070c8db4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb4a8cb4fb37112ba8bea6d070950db.png)
![](https://img.xkw.com/dksih/QBM/2021/3/30/2688810050207744/2697638117400576/STEM/e2724d74-7a8c-46c9-8051-5213716f1547.png)
A.0个 | B.1个 | C.2个 | D.3个 |
2021·广东佛山·一模 查看更多[7]
更新时间:2021-04-11 18:21:42
|
相似题推荐
单选题
|
较易
(0.85)
【推荐1】对于二次函数
,下列描述:①开口向上;②与y轴交于点
;③当
时,y随x的增大而增大;④当
时,函数y有最小值
.其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8814cc55dfe48002c59eb86524b656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca5c718573bce78378c9335d6cd88b2.png)
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A.①②③④ | B.①③④ | C.①②④ | D.①②③ |
您最近一年使用:0次
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【推荐2】两个不同的二次函数
与
的图像有相同的对称轴,则下列结论不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c05523fca7931f2301b22cc1da8fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76fd0c7b02065447122f4c44de7eab1.png)
A.这两个函数图像的开口方向相反 | B.这两个函数图像的都经过点![]() |
C.这两个函数图像的关于![]() | D.二次函数![]() ![]() |
您最近一年使用:0次
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【推荐1】二次函数
的图象关于直线
对称,与x轴交于点
,其部分图象如图所示,下列结论中不成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b3c94d505e7c5bcce94afec4af3d92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/356bda37-b676-433c-ae25-462c2757ce5e.png?resizew=131)
A.![]() |
B.![]() |
C.关于x的方程![]() |
D.当![]() ![]() |
您最近一年使用:0次
单选题
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【推荐2】如图,二次函数
的图像与
轴交于点
,与
轴交于点
,若它的对称轴是直线
,则下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/3ef7a02e-d1e2-424d-9178-c1efc4462551.png?resizew=238)
A.![]() | B.![]() |
C.![]() | D.若![]() ![]() ![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐1】如图所示的抛物线是二次函数
的图象,其对称轴为
,过
则下列结论:①
;②
;③方程
的两根为
,
;④
,其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/d50af6cb-b4cd-4f1b-bc99-dc5d22ba9df0.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3bad6a7367ef0d72bf02588d875174e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd6a84d994f86ef1e060e1b1183eeca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de10eb4cf291d00db3bb92596143afa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7b380d82f311ec47be64bbd9fd32e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9448f932d5db7dc6864bc7e86ca36ab4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/d50af6cb-b4cd-4f1b-bc99-dc5d22ba9df0.png?resizew=185)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】如图,是函数
(0≤x≤4)的图象,通过观察图象得出了如下结论:
(1)当x>3时,y随x的增大而增大;
(2)该函数图象与x轴有三个交点;
(3)该函数的最大值是6,最小值是﹣6;
(4)当x > 0时,y随x的增大而增大.
以上结论中正确的有( )个
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730112646062080/2730799222161408/STEM/6d4e328a-bf0e-4aec-9459-e2f8f49687d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0d99c171b323efd0caad19a0aec53b.png)
(1)当x>3时,y随x的增大而增大;
(2)该函数图象与x轴有三个交点;
(3)该函数的最大值是6,最小值是﹣6;
(4)当x > 0时,y随x的增大而增大.
以上结论中正确的有( )个
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730112646062080/2730799222161408/STEM/6d4e328a-bf0e-4aec-9459-e2f8f49687d0.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐1】若二次函数y=ax2+bx-1的最小值为-3,则方程|ax2+bx-1|=2的不相同实数根的个数是( )
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】二次函数
的图象如图所示,则关于
的方程
的根的情况是( )
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A.有两个相等的实数根 | B.有两个不等的实数根 |
C.没有实数根 | D.无法判断 |
您最近一年使用:0次