如图,抛物线
与
轴交于点
,其对称轴为直线
,结合图象给出下列结论,①
;②
:③
时,
随
的增大而增大;④若关于
的一元二次方程
没有实数根,则
;⑤对于任意实数
,总有
.其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a395a7795e783b4596bef9775d02ed6f.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/833f34b0aadc506f488503a7a8745aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41c6b9fa72109ba69163a5c6b7874a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0194b651c6321ba2358ee18a7ed5544.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/795b92ef-ecbb-4535-9817-4377e73bc01e.png?resizew=153)
A.2个 | B.3个 | C.4个 | D.5个 |
更新时间:2023-12-07 09:01:19
|
相似题推荐
单选题
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(0.65)
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【推荐1】二次函数
的部分图象如图所示,图象过点
,对称轴为直线
,下列结论:(1)
;(2)
;(3)
;(4)若点
在该函数图象上,则
;其中正确的结论有( )个.
![](https://img.xkw.com/dksih/QBM/2022/10/27/3096805729075200/3101682962464768/STEM/4b0f928881e54b358893ca75a3157470.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630bb948780be53bc73d9ddef875000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e8ebd1d7fc0e20a1de79ed02516e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0932983ccb18873f11ff7078e19e9dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e64d789334d4f26fa3d72cf63fb87e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4557a97a17857a08aeb0a39489f10b.png)
![](https://img.xkw.com/dksih/QBM/2022/10/27/3096805729075200/3101682962464768/STEM/4b0f928881e54b358893ca75a3157470.png?resizew=144)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】四位同学在研究函数
(
是常数)时,甲发现当
时,函数有最小值;乙发现
是方程
的一个根;丙发现函数的最小值为3;丁发现当
时,
,已知这四位同学中只有一位发现的结论是错误的,则该同学是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a475fec8ded321e10a6697319fb975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b800b7d6a688abf8a3018c133cec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de72a5190834f5dbe895596656c038b3.png)
A.甲 | B.乙 | C.丙 | D.丁 |
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【推荐1】如图是二次函数
的部分图象,其顶点坐标为
,且与x轴的一个交点在点
和
之间,则下列结论:①
;②
;③
;④一元二次方
有两个不相等的实数根;⑤
,其中正确( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3ada1001-75cb-4f2b-8602-f5a577ce9208.png?resizew=225)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ae2bdb471fa72711d959d70c6b5652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dda5bbebcf292501b548c8f2e0da428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e2fb818b15dcd2e3a548e23d39502a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea781875e43a5d70942f6e258054572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5b998c9460ba85a821126ff2b72d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601f691c260c95031b8f8812cb2f4bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5d55b3906494569b9aef9e5afc059f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea840f210f9b5b839edb5d34ee2a4f83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3ada1001-75cb-4f2b-8602-f5a577ce9208.png?resizew=225)
A.①②③ | B.①③④⑤ | C.①④ | D.②③⑤ |
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【推荐2】已知二次函数
的
与
的部分对应值如表:
下列结论:①抛物线的开口向上;②抛物线的对称轴为直线
;③当
时,
;④抛物线与
轴的两个交点间的距离是
;⑤若
是抛物线上两点,则
;⑥
. 其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
下列结论:①抛物线的开口向上;②抛物线的对称轴为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeccf0358c02b53554a0f6d3dc33cbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b7e8e79761a4f8bff30e8963cd27da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】抛物线y=ax2+bx+c的对称轴是直线x=﹣1,且过点(1,0),顶点位于第二象限,其部分图象如图所示,给出以下判断:①ab>0且c<0;②4a﹣2b+c>0;③8a+c>0;④c=3a﹣3b;⑤直线y=2x+2与抛物线y=ax2+bx+c两个交点的横坐标分别为
,
,则
其中正确的选项是( )
![](https://img.xkw.com/dksih/QBM/2021/12/1/2862911149826048/2863730010595328/STEM/f2808ebef5c94f6f92e565ba899274ea.png?resizew=198)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee6f24b78bc2455558d9d4fc992ae00.png)
![](https://img.xkw.com/dksih/QBM/2021/12/1/2862911149826048/2863730010595328/STEM/f2808ebef5c94f6f92e565ba899274ea.png?resizew=198)
A.①③ | B.①②④ | C.②④⑤ | D.②③④⑤ |
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【推荐2】如图所示,二次函数y=ax2+bx+c的图象与x轴的交点的横坐标分别为﹣3和1,则下列结论:①abc<0;②b2﹣4ac>0;③a+b+c<0;④方程ax2+bx+c=0的解是x1=﹣3,x2=1;⑤不等式ax2+bx+c>0的解集是﹣3<x<1.其中正确的有几个?( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/c8d55ea2-588e-4b11-8ab7-8d967d9cd417.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/c8d55ea2-588e-4b11-8ab7-8d967d9cd417.png?resizew=170)
A.5个 | B.4个 | C.3个 | D.2个 |
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