已知抛物线
(
,
,
是常数,
,
)经过点
,其对称轴是直线
.有下列结论:
①
;
② 关于
的方程
有两个不等的实数根;
③
.
其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4cc00c283519973f7f8e1274b5c733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623afc24f2227004b0e1b3922dfb954b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4178817bfc8a0ea1e2ff977d7fb76d36.png)
② 关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e200617596d1eaca1aab3f1a33c18.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b936e7ed073155badf0b95937cbbe45.png)
其中,正确结论的个数是( )
A.3 | B.2 |
C.1 | D.0 |
更新时间:2022-11-22 21:00:59
|
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【推荐1】二次函数
的图象如图所示,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/5f1fa127-9ecd-43fe-a478-45117fe2c4ce.png?resizew=165)
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您最近一年使用:0次
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【推荐2】如图,抛物线
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,结合图像给出下列结论:
①
;②
;③当
时,
随
的增大而增大;④关于
的一元二次方程
有两个不相等实数根;⑤当
时,
其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/945d8fae-51ea-4cb2-9e19-5b1817b88130.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5469918fc2803d9d5b2951b3296fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd5e63fa07bbfcc6d5b1b68716d8c731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/945d8fae-51ea-4cb2-9e19-5b1817b88130.png?resizew=174)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
单选题
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【推荐1】二次函数
的图象如图所示,下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/fafccfd0-83ee-48a5-92eb-64fcfb5298a4.png?resizew=135)
A.![]() | B.![]() |
C.当![]() ![]() ![]() | D.![]() |
您最近一年使用:0次
单选题
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较易
(0.85)
【推荐2】如图所示,抛物线
的对称轴为直线
,与y轴的交点坐标为
,其部分图象如图所示,下列结论:①
;②
;③方程
的两个根是
,
;④方程
有一个实根大于2;⑤当
时,y随x增大而减小.其中正确的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/d5c94b3a-d284-4f37-8af0-624f3d32783e.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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A.①③④ | B.①②④ | C.①③ | D.①③④⑤ |
您最近一年使用:0次
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名校
【推荐1】二次函数
的图象如图所示,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620436091117568/2622455478263808/STEM/2c48c886fb8940b68b667d34df017f81.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620436091117568/2622455478263808/STEM/2c48c886fb8940b68b667d34df017f81.png?resizew=144)
A.a>0 | B.b>0 | C.c>0 | D.b2-4ac>0 |
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您最近一年使用:0次