如图所示是二次函数
的图象,以下结论:①
;②
;③
的两个根是
,
;④
,其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/0311643f-73ef-4b19-b455-207435fbf965.png?resizew=135)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1beec07792cbfc2f46de2aa151c5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4049b329e8cf711663e050e0dc9cdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e4fd085ee10f340a008389c4a1a80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad29acf28ab96fb1604e80c743bd738f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/0311643f-73ef-4b19-b455-207435fbf965.png?resizew=135)
A.③④ | B.①② | C.②③ | D.②③④ |
21-22九年级上·陕西安康·期末 查看更多[6]
陕西省安康市岚皋县2021-2022学年九年级上学期期末数学试题(已下线)第11课 二次函数y=ax2+bx+c(a≠0)的图象与性质-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(人教版)(已下线)22.1.7 二次函数字母系数与图象的关系(分层练习)-2022-2023学年九年级数学上册同步精品课堂(人教版)湖南省益阳市赫山区平高学校2022-2023学年九年级下学期期中数学试题河北省衡水市景县第二中学2023-2024学年九年级上学期第一次月考数学试题河北省沧州市东光县五校联考2023-2024学年九年级上学期月考数学试题
更新时间:2022-08-05 09:52:52
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【推荐1】如图所示的抛物线y=ax2+bx+c的对称轴为直线x=1,则下列结论中错误的是( )
![](https://img.xkw.com/dksih/QBM/2020/5/16/2463732819410944/2463935556657152/STEM/3a7a9aceeb094d75b8c6d21232510c4e.png?resizew=209)
![](https://img.xkw.com/dksih/QBM/2020/5/16/2463732819410944/2463935556657152/STEM/3a7a9aceeb094d75b8c6d21232510c4e.png?resizew=209)
A.ac<0 | B.b2﹣4ac>0 | C.2a﹣b=0 | D.9a+3b+c=0 |
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【推荐2】如图,在平面直角坐标系中2条直线,分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
,直线
交
轴于点
,交
轴于点
,直线
交
轴于点
,过点
作
轴的平行线交
于点
,抛物线
过
、
、
三点.
下列判断中:
①
;
②抛物线关于直线
轴对称 ;
③点
在抛物线上方;
④
;
⑤
.其中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/2020/2/14/2398793651740672/2398922766565376/STEM/396f8c2911514ff4acc895c8549b3c7c.png?resizew=116)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4592d0db8dd8b8f0ccbd572b8988d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ec811c9ee1389abe42b20680b3f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df621d466946fffca5e6ab71f13fb48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d0d46da745fa5e71ea97e7b30beb6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e8babee63bfc889ae5a34632284bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e8babee63bfc889ae5a34632284bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1066495698e891f01ef5586a3a1be6bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e8babee63bfc889ae5a34632284bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
下列判断中:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
②抛物线关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffc05380f01a67e2ec65797c3cf5239.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13d8405f87e7f4b6e7f1c75a0af2307.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19368cd15dde2eb5d6a6d5fb2f4fe76d.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac81d06ba162d80dc8444d9c8179fa37.png)
![](https://img.xkw.com/dksih/QBM/2020/2/14/2398793651740672/2398922766565376/STEM/396f8c2911514ff4acc895c8549b3c7c.png?resizew=116)
A.5 | B.4 | C.3 | D.2 |
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【推荐1】已知二次函数y=ax2+bx+c的图像如图,则下列结论:①ac>0
②a-b+c="0" ③ x<0时,y <0;④ax2 + bx + c=0(a≠0)有两个不小于-1的实数根.其中错误的结论有( )
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915533426688/1573915539095552/STEM/ec7882757d834bfd87ba41332903e083.png)
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915533426688/1573915539095552/STEM/1b7e22524533487b98ec867156a3c3cb.png)
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573915533426688/1573915539095552/STEM/ec7882757d834bfd87ba41332903e083.png)
A.①② | B.③④ | C.①③ | D.②④ |
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【推荐2】二次函数
的图像如图,下列结论:①
;②
;③
;④
.正确的个数为( )
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189259382366208/2189470438866944/STEM/bd215d7cf7374c309b35c40d68e71d2c.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5012d02b4ab86789bf114c697fcba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbc1d6a66b5583e556fbf194164b068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744216555ad3e5bb50fd47eedf9ba9d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4733c99fce3594eeb679647f5e3683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642949afda79c9f032ea0d587745fdcf.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189259382366208/2189470438866944/STEM/bd215d7cf7374c309b35c40d68e71d2c.png?resizew=114)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,已知二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A(﹣1,0),与y轴的交点B在(0,﹣2)和(0,﹣1)之间(不包括这两点),对称轴为直线x=1.下列结论:①abc>0;②4a+2b+c>0;③4ac﹣b2>8a;④
; ⑤b>c.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/84f627a3-bd20-49e2-b31d-d9917d1f3178.png?resizew=176)
其中含所有正确结论的选项是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504460b4da08352f1d08e8ce7744b9af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/84f627a3-bd20-49e2-b31d-d9917d1f3178.png?resizew=176)
其中含所有正确结论的选项是( )
A.①②③ | B.②③④ | C.①④⑤ | D.①③④⑤ |
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【推荐2】如图,二次函数
的图象如图所示,有下列结论:①
;②
;③
;④
.其中正确的结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071338261544960/2136719808471040/STEM/07f829508a844ed3be14130c8af87637.png?resizew=79)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51c8c8a7936453b45151cf432a4314e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3627cc379be05717f1211eb7754f77f.png)
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A.3 | B.2 | C.1 | D.0 |
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