已知二次函数
的图象如下图所示,给出下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/aa9602e1-7166-4a87-a710-111e78b91747.png?resizew=194)
①
②
③
④
中,
其中正确结论的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/aa9602e1-7166-4a87-a710-111e78b91747.png?resizew=194)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f2e8b5365c2f086a02e5dd3c3bd116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630bb948780be53bc73d9ddef875000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb74fe4db4b34a9fa790989ac717dfcc.png)
其中正确结论的个数为( )
A.0 | B.1 | C.2 | D.3 |
更新时间:2024-01-14 21:12:12
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【推荐1】如图是二次函数
(
是常数,
)图象的一部分,与
轴的交点A在点(2,0)和(3,0)之间,对称轴是
=1.对于下列说法:①
<0;②
;③
;④
(
为实数);⑤当
时,
;其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2d7ddd7ef3b6cde30018bc6a84b9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd352ddaeb1f2e6afc05470bf6be9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85db04ca5ad0f820ebbb12ba52b54be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b843858ba23012c724dea0c51d54a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
A.①②④ | B.①②⑤ | C.②③④ | D.③④⑤ |
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【推荐2】如图所示是二次函数
图像的一部分,那么下列说法中不正确的是( ).
![](https://img.xkw.com/dksih/QBM/2021/1/8/2631936343605248/2634424274264064/STEM/21940c4ae8a1460f9237cdf3708935d0.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://img.xkw.com/dksih/QBM/2021/1/8/2631936343605248/2634424274264064/STEM/21940c4ae8a1460f9237cdf3708935d0.png?resizew=160)
A.![]() | B.抛物线的对称轴为直线![]() |
C.![]() | D.点![]() ![]() ![]() |
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【推荐1】二次函数y=ax2+bx+c的图象如图所示,在ab、ac、b2﹣4ac,2a+b,a+b+c,这五个代数式中,其值一定是正数的有( )
![](https://img.xkw.com/dksih/QBM/2018/1/3/1852439357390848/1859030756589568/STEM/7f813082a80a4cd8a708d29e7c0822eb.png?resizew=136)
![](https://img.xkw.com/dksih/QBM/2018/1/3/1852439357390848/1859030756589568/STEM/7f813082a80a4cd8a708d29e7c0822eb.png?resizew=136)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,二次函数
的图形与
轴交于
两点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035df3b539d4cbe9f39354d170ec9cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd014218e0ef5b84d7d4789b24ce7735.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/3261e50a-be1f-4e50-9c45-685a5b08a2b6.png?resizew=152)
A.![]() ![]() | B.点A的坐标为![]() |
C.![]() | D.当![]() |
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【推荐1】已知抛物线
经过点
,且当
时,
,则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f436117499e8ba9cb034e2704fc0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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【推荐2】若无论
取何值,代数式
的值恒为非负数,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5dc27dbe784366fb6c35e8a413a86c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.0 | B.![]() | C.![]() | D.1 |
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