已知二次函数
的图象如图所示,给出下列结论:①
;②
;③
为任意实数
;④
;其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5469918fc2803d9d5b2951b3296fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc441e775dea45f7b3c9ae1ee72c489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0c865c1f8d424665e0f756aa600ff1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/b3ae1f00-723d-492d-a497-e3034212f637.png?resizew=144)
A.![]() | B.![]() | C.![]() | D.![]() |
23-24九年级上·云南·开学考试 查看更多[4]
云南师范大学实验中学昆明湖校区2023-2024学年上学期九年级开学数学试题(已下线)专题01 二次函数的图像与性质(30题)-【帮课堂】2023-2024学年九年级数学上册同步学与练(人教版)湖北省随州市随县历山学校三校联考2023-2024学年九年级上学期第一次月考数学试题江西省南昌市雷式学校2023-2024学年九年级上学期月考数学试题
更新时间:2023-09-12 16:14:13
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【推荐1】已知二次函数y=ax2+bx+c(a≠0)的图象经过点(﹣1,0),(5,0),图象上有三个点(x1,y1),(x2,y2),(x3,y3).若当x1<﹣1<x2<5<x3时,均有y1y2<0,y2y3<0,则下列说法中正确的是( )
A.a<0 | B.x=2时,y有最大值 |
C.y1y2y3<0 | D.5b=4c |
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【推荐2】二次函数
(
为常数,且
)中
与
的部分对应值如表:
①
;②
;③
;④当
时,
,下列结论中正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | … | ![]() | 0 | 1 | 3 | … |
![]() | … | ![]() | 3 | 5 | 3 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】在平面直角坐标系中,已知二次函数
的图象如图所示,有下列5个结论:①
;②
;③
;④
;⑤
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/8c72fdcd-26d5-4b58-b840-b0094b57aaf9.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,已知二次函数
的图象与
轴交于
,
两点,与
轴交于点
,
,对称轴为直线
,则下列结论:①
;②
;③
;④
,其中正确的有( )个.
![](https://img.xkw.com/dksih/QBM/2020/12/17/2622573625819136/2625069781680128/STEM/59b2e150-df1a-4f73-8f12-ac63f0615958.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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![](https://img.xkw.com/dksih/QBM/2020/12/17/2622573625819136/2625069781680128/STEM/59b2e150-df1a-4f73-8f12-ac63f0615958.png?resizew=176)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
单选题
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适中
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【推荐1】二次函数
(
)的图象如图所示,下列结论中:
①
;②
;③
;④
;⑤
(
的实数).
其中正确结论的有( )
![](https://img.xkw.com/dksih/QBM/2014/12/26/1573778268004352/1573778274156544/STEM/430f8f62cc9e4a2cbdad709aec514c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de648cd39338d48f2d22eb82a77b4839.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb6457c913ada60828b15d30cef9c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0e368cd3373accaae8ffdff76bf749.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4954a657cc8faaaa514212b9dd12aa.png)
其中正确结论的有( )
![](https://img.xkw.com/dksih/QBM/2014/12/26/1573778268004352/1573778274156544/STEM/430f8f62cc9e4a2cbdad709aec514c61.png)
A.①②③ | B.①③④ | C.③④⑤ | D.②③⑤ |
您最近一年使用:0次
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【推荐2】二次函数
的图象如图所示,有下列结论:①
,②
,③
,④
,正确的是 ( )
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851941749342208/2857503364947968/STEM/ee80f5e7-6953-4336-be4c-5a76c96c6943.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
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A.①②③ | B.①②④ | C.①③④ | D.②③④ |
您最近一年使用:0次
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【推荐1】二次函数y=ax2+bx+c(a,b,c是常数,且a≠0)中的x与y的部分对应值如表所示,则下列结论中,正确的个数有( )
①a<0;②当x<0时,y<3;③当x>1时,y的值随x值的增大而减小;④方程ax2+bx+c=5有两个不相等的实数根.
x | ﹣1 | 0 | 1 | 3 |
y | ﹣1 | 3 | 5 | 3 |
①a<0;②当x<0时,y<3;③当x>1时,y的值随x值的增大而减小;④方程ax2+bx+c=5有两个不相等的实数根.
A.4个 | B.3个 | C.2个 | D.1个 |
您最近一年使用:0次
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适中
(0.65)
【推荐2】已知二次函数
,其中y与x的部分对应值如表:
下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
x | -2 | -1 | 0.5 | 1.5 |
y | 5 | 0 | -3.75 | -3.75 |
A.![]() |
B.当![]() |
C.![]() |
D.方程![]() ![]() ![]() |
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