已知抛物线
上部分点的横坐标x纵坐标y对应值如表:
以下说法不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecff2b807315608e925d1e5c6a63a1d.png)
x | …… | ﹣1 | 0 | 1 | 2 | 3 | …… |
y | …… | 0 | ﹣3 | ﹣4 | ﹣3 | m | …… |
A.![]() |
B.![]() |
C.方程![]() ![]() ![]() ![]() |
D.函数![]() ![]() ![]() |
更新时间:2022-12-16 14:17:15
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【推荐1】二次函数
(
,
,
为常数,
)中的
与
的部分对应值如下表:
下列结论:其中正确的是( )
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
下列结论:其中正确的是( )
x | -1 | 0 | 1 | 2 |
y | -1 | 3 | 5 | 5 |
A.![]() | B.当![]() ![]() ![]() |
C.![]() | D.抛物线与x轴有两个交点 |
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【推荐2】已知二次函数y=-3x2+1的图象如图所示,将其沿x轴翻折后得到的抛物线的表达式为( )
![](https://img.xkw.com/dksih/QBM/2017/11/9/1813407680495616/1817610596392960/STEM/bf256f7d9c094188b89bc616637e25b2.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/2017/11/9/1813407680495616/1817610596392960/STEM/bf256f7d9c094188b89bc616637e25b2.png?resizew=108)
A.y=-3x2-1 | B.y=3x2 | C.y=3x2+1 | D.y=3x2-1 |
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【推荐1】如图,
中,
,
,
,
,垂足为D,点E从点B出发,沿线段BA匀速向终点A运动,作点E关于AD的对称点F,连接EF,连接ED,FD,设BE的长为x,
的面积为y,下列图象中大致反映y与x之间函数关系的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696022241968128/2700301271629824/STEM/b8c89dbc826e4f24a528e106fab4c95f.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e67da1bf51e5f87750a63dc9e856ee87.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2696022241968128/2700301271629824/STEM/b8c89dbc826e4f24a528e106fab4c95f.png?resizew=136)
A. ![]() | B. ![]() | C. ![]() | D. ![]() |
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【推荐2】如图,抛物线y=ax2+bx+c的对称轴为直线x=1,且过点(3,0),下列结论:①abc<0;②a﹣b+c>0;③2a+b=0;④b2﹣4ac<0;正确的有( )个.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/7575f736-9a22-4fd1-a720-7a5b7066b23b.png?resizew=142)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/7575f736-9a22-4fd1-a720-7a5b7066b23b.png?resizew=142)
A.1 | B.2 | C.3 | D.4 |
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【推荐1】已知点
,
,
均在抛物线
的图象上,且
,点
和
也在此抛物线上,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0778813665f307942db9769077032f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9205b92dbbac16ae84fc8810e80613f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458ee4d93e21ec4ded0a7635b1feeeaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d341038ce5cd60a682f831d740a95af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa91ac5fd9ca215959eacb6ab809cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/406c04b95b4ad818e32bbaeb08685780.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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【推荐2】对于二次函数y=ax2+bx+c,令f(x)=ax2+bx+c,则f(x0)表示当自变量x=x0时的函数值.若f(5)=f(﹣3),且f(﹣2018)=2020,则f(2020)=( )
A.2020 | B.2018 | C.﹣2018 | D.﹣2020 |
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【推荐1】已知关于x的一元二次方程
有两个不相等的实数根
,
,有下列结论:①
;②
;③二次函数
的图象与x轴交点的横坐标分别为a和b,则
.其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200437bd36277edbc3e48b56ba23f50d.png)
![](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/701764968a47cc0af5de2823fc757623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fca76f6c123ddc45e890873740bcc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8c436698c3dcb16236315414df04aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff7e62312dbd1cd5b50a6dc7fdfc166.png)
A.0 | B.1 | C.2 | D.3 |
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【推荐2】如图,将抛物线
在x轴下方部分沿x轴翻折,其余部分保持不变,得到图形
,当直线
与图形
恰有两个公共点时,则b的取值范围是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/c95be98a-170a-48db-a7ea-9e55c20f864a.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d794141572c8b1e70957754f32b9eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee988ef10d4c08a0a0d3b5f5bf544ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/c95be98a-170a-48db-a7ea-9e55c20f864a.png?resizew=114)
A.![]() | B.![]() | C.![]() | D.![]() |
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