如图是二次函数
图象的一部分,
是对称轴,且经过点
.有下列判断:①
;②
;③
;④若
,
是抛物线上两点,则
.其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492a08866e2259e107cb15ce0200e04e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbcf3f7721240b8d2161f8c66a0fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb7b87747121ebdc0d3db70e3da36a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13418e3c47843ca0d4b32eadbb01f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cc6b9d87d76c6392e8842bf9a9e9b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabb8d706ac1058a8a56058f8837e420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
A.①②③ | B.①③④ | C.①②④ | D.②③④ |
更新时间:2022-12-15 16:02:43
|
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】抛物线
中自变量x和函数值y的部分对应值如下表:
从上表可知,下列说法正确的个数是( )
①抛物线与x轴的一个交点为
;
②抛物线与y轴的交点为
;
③抛物线的对称轴是:
;
④在对称轴左侧,y随x增大而增大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554f4ba8f06ea7450893e710cd555e4c.png)
x | … | ﹣2.5 | ﹣1 | ﹣0.5 | 0 | 0.5 | 1 | 1.5 | … |
y | … | p | n | m | n | q | 0 | … |
从上表可知,下列说法正确的个数是( )
①抛物线与x轴的一个交点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b818c643aa48668eabc47a79e8eca8.png)
②抛物线与y轴的交点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1bc71a4700b153b792e5398ff53bf4.png)
③抛物线的对称轴是:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7152aea5d046953a8c931571be7c529.png)
④在对称轴左侧,y随x增大而增大.
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图,已知抛物线y=ax2+bx+c(a≠0)交x轴于点A(﹣1,0)和x轴正半轴于点B,且BO=3AO交y轴正半轴于点 C.有下列结论:①abc>0;②2a+b=0;③x=1时y有最大值﹣4a;④3a+c=0,其中,正确结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】如图已知二次函数
的图象与y轴正半轴相交,对称轴为直线
,顶点坐标
.则下列结论中:
①
;②
;③
;④当
时,方程
有两个不相等的实数根.
正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fd2fc404c44fe1be49f9f825ea0d05.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4944b18a1daae0480089124e5551107f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2adf9844eeba4f2596469c21624fe3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b08d4c75af613350a7d183efab8dd65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2632fdb2c5dc8e65d5d44f4861f0cc6e.png)
正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/cf1854e0-d308-478d-9c2d-5c04c4cfcd3c.png?resizew=144)
A.①②③ | B.①②④ | C.①③④ | D.①②③④ |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】下图是二次函数
的部分图象,图象过点
,对称轴为直线
,小亮观察图象,得出五条结论:①
;②
;③
;④当
时,
的值随
值的增大而增大;⑤
(
为任意实数).你认为其中正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/d3611620-4c46-4784-9527-7f8584c16e19.png?resizew=163)
![](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/77694c11ba40ec5c2fc4f6a05e31a048.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/adc3e5be1796493161a4df7e28a6f6b7.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/85cc8b2a26fa0b1ce13bc86b25eed294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/d3611620-4c46-4784-9527-7f8584c16e19.png?resizew=163)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】如图,二次函数
的图像与
轴交于
、
两点,与
轴交于点
,且
,则下列结论:①
;②
;③
;④
.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846720768851968/2851148839198720/STEM/6a723e20-7f6d-4d32-8fab-06e52decc306.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f32326056c3ce77b90af0b7f9ebde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143fb56f6f05c39fb5f52c7ecefdcb22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e784c229cb26754ee6aab30768fff844.png)
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846720768851968/2851148839198720/STEM/6a723e20-7f6d-4d32-8fab-06e52decc306.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】二次函数
的图象如图所示,下列结论:①
;
②
;③m为任意实数时,
;④
;⑤若
,且
,则
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/5ef23a6b-d757-49c3-b20a-39563e9e0d2f.png?resizew=117)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbcf3f7721240b8d2161f8c66a0fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e551755d48c059760898baaa1b883625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4deee559d44a0d1c1016b2053539f2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419504736c4934f6e0df4114c3743944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/5ef23a6b-d757-49c3-b20a-39563e9e0d2f.png?resizew=117)
A.4个 | B.3个 | C.2个 | D.1个 |
您最近一年使用:0次