如图,抛物线
的对称轴为直线
,与
轴的一个交点坐标为(-1,0),与
轴交点为(0,3),其部分图象如图所示,则下列结论错误的是( )
①
;②当
时,
随
的增大而减小;③当
时,
;④关于
的方程
有两个相等的实数根
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c766352f0be38b719621052de92615bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.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/a57458464618fcf619375a93d3c66d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b843858ba23012c724dea0c51d54a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96900bad6bfca4efce6f297c5b6a33d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/5ab2c413-ddcf-4932-9dfd-621190bc5ad6.png?resizew=129)
A.①③ | B.②④ | C.③④ | D.①②④ |
更新时间:2020-11-22 21:39:11
|
相似题推荐
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适中
(0.65)
【推荐1】二次函数y=ax2+bx+c(a≠0)的图象如图所示,下列说法:
①2a+b=0,
②9a+3b+c=0,
③当-1≤x≤3时,y<0,
④若(x1,y1)、(x2,y2)在函数图象上,当x1<x2时,y1<y2.
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/12/13/2354409024266240/2355485471744000/STEM/fc7eb71b262c47a6bdbc47e183b99125.png?resizew=202)
①2a+b=0,
②9a+3b+c=0,
③当-1≤x≤3时,y<0,
④若(x1,y1)、(x2,y2)在函数图象上,当x1<x2时,y1<y2.
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/12/13/2354409024266240/2355485471744000/STEM/fc7eb71b262c47a6bdbc47e183b99125.png?resizew=202)
A.①②④ | B.①②③ | C.①② | D.②③④ |
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【推荐2】二次函数
的部分图象如图所示,其对称轴为直线
,且与x轴的一个交点坐标为
.以下结论:①
;②
;③
;④若点
、点
、点
在该函数图象上,则
.其中正确结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee8c50793afd59e6ab4a2be5a877759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203ece41ac9b10a2ca02b80d05207e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473f0c47048c652a7396925c58548c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b0e6f63edfcf62da9341360f3a8e73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eecaff897e229be4f52986e030977400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b44c63a912c9f07b80fb8f5bdde7a8.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】二次函数
的图像的一部分如图所示,已知图像经过点
,其对称轴为直线
.下列结论:①
;②
;③
;④
;⑤点
,
是抛物线上的两点,若
,则
;⑥若抛物线经过点
,则关于
的一元二次方程
的两根分别为
,5;其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/65e7feab-ed3d-44a7-bc57-529d11a948fe.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b3c94d505e7c5bcce94afec4af3d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9deb79d044a379f31a8fc57736d7ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cedc3e9843a1c1cf80bc57ecc7d3910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13a64343eaad8b9dca939994e5a18b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf46f52b6aa1e070a73fa9d0ea64bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9521aa0b9cf19a6928b137729d973ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ef726db32be16b6b25506472c7e59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39ff7e27c7d2a0a337e4bf2b3576b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/65e7feab-ed3d-44a7-bc57-529d11a948fe.png?resizew=139)
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】已知抛物线y=ax2+bx+c的顶点为(-3,-6),有以下结论:①当a>0时,b2>4ac;②当a>0时,ax2+bx+c≥-6;③若点(-2,m) ,(-5,n) 在抛物线上,则m<n;④若关于 x 的一元二次方程ax2+bx+c=-4的一根为-5,则另一根为-1.其中正确的是( )
A.①② | B.①③ | C.②③④ | D.①②④ |
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