已知二次函数
的图象如图所示,有下列
个结论:
;
;
;
;其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238b0bdd3afab8fce6e40c7da1548936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26db9b94e117a4ad45a353fb016be3f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbeeb6f0836b636ed4f6e7959ac4733e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90fcfd225f351a6cd0861daefed1a29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/5954d055-31aa-4835-9240-4241eacac542.png?resizew=145)
A.![]() | B.![]() | C.![]() | D.![]() |
2022·广东湛江·一模 查看更多[9]
2022年广东省湛江市坡头区中考一模数学试卷新疆维吾尔自治区和田地区墨玉县2022-2023学年九年级上学期期末数学试题2022年湖南省长沙市雨花区中考一模数学试题湖北省恩施市沙地、崔坝、双河、新塘四校2023-2024学年九年级上学期期中数学试题湖北省恩施市白杨坪镇熊家岩初级中学2023-2024学年九年级上学期第二次月考数学试题(A卷)2023年广东省茂名市电白区中考三模数学试题河北省邯郸市永年区2023-2024学年九年级上学期期末数学试题河北省邯郸市邯郸经济技术开发区2023-2024学年九年级上学期期末数学试题(已下线)专题05 二次函数(5大易错点分析)-备战2024年中考数学考试易错题(浙江专用)
更新时间:2023-06-12 15:33:49
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【推荐1】二次函数
与一次函数
的图象如图所示,当
时,自变量
的取值范围是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/5ad1e73c-c2a8-441a-90d2-f69b7801fea2.png?resizew=149)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3abec4f56ca94d92afcb02be672f4bea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564c3f568c587c60dac66fea620acc24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/5ad1e73c-c2a8-441a-90d2-f69b7801fea2.png?resizew=149)
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【推荐2】若
为二次函数
图象上的三点,则
,
,
的大小关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4b891f7c12951735756439b8e06bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c5cef6b5c94c80589edfe2bf44eaa95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,二次函数
(a、b、c为常数,且
)的图象与x轴的一个交点坐标为
,对称轴为直线
.下列结论:①
时,y随x的增大而增大;②
;③
;④关于x的方程
有两个不相等的实数根.其中,正确结论的序号为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/4f3572b3-562d-44cf-a196-bcfcfd1c5feb.png?resizew=135)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810961de0c2c5174c5be32e8e5b4bf21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/4f3572b3-562d-44cf-a196-bcfcfd1c5feb.png?resizew=135)
A.②③ | B.②④ | C.①② | D.②③④ |
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【推荐2】二次函数y=﹣x2+bx+c的图象如图所示,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986774034219008/2990413023158272/STEM/0be16f0f148f4fdda5d79e33b1045c04.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986774034219008/2990413023158272/STEM/0be16f0f148f4fdda5d79e33b1045c04.png?resizew=174)
A.b<0,c>0 | B.b>0,c>0 | C.b>0,c<0 | D.b<0,c<0 |
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【推荐1】如图,抛物线y=ax2+bx+c与x轴交于点A(﹣1,0),顶点坐标为(1,n),与y轴的交点在(0,2)、(0,3)之间(包含端点),则下列结论:①当x>3时,y<0;②3a+b>0;③﹣1≤a≤
;④3≤n≤4中,其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/2e455cd7-be57-4739-9938-f7052d8e4491.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459c84c9addfbd1cdd0a877ba7c584e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/2e455cd7-be57-4739-9938-f7052d8e4491.png?resizew=176)
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
的图象如图所示,其对称轴为直线
,以下4个结论:①
;②
;③
,其中
;④
.其中正确结论的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a134e2ccd3cc5fa8cf9da498461776f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5004e046f3608f621aa8531c5c9bb8.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/85d31195-c764-46f1-967c-b77481f39b82.png?resizew=195)
A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐1】下表给出了二次函数
中x,y的一些对应值,则可以估计一元二次方程
的一个近似解
的范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807d62d0b5623b3bd3cb285560bf8436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
x | … | … | |||||
y | … | … |
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【推荐2】如图,二次函数
的图象过点
,对称轴是直线
.下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6ed6a3b3056d3762d8a234d3a9d2a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/42b374b8-3bdf-4fdf-af5a-ff4d343a992c.png?resizew=106)
A.![]() | B.![]() |
C.![]() | D.若点![]() ![]() |
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