已知二次函数
的图象如图所示,对称轴为
.下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573954544173056/1573954549555200/STEM/37267e8cff9445b78f04fe9fc4762eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3836a000fa859cd496089c04468f4881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573954544173056/1573954549555200/STEM/37267e8cff9445b78f04fe9fc4762eb0.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
更新时间:2019-01-30 18:14:09
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【知识点】 根据二次函数的图象判断式子符号解读
相似题推荐
单选题
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适中
(0.65)
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【推荐1】已知二次函数y=ax2+bx+c(a≠0)的图象如图所示,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618370440626176/2618456993841152/STEM/8cc55fe5-443c-4979-b8ad-90d646d38ec3.png?resizew=216)
(1)abc>0 (2)4ac-b2<0 (3)4a+2b+c<0 (4)2a-b=0
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618370440626176/2618456993841152/STEM/8cc55fe5-443c-4979-b8ad-90d646d38ec3.png?resizew=216)
(1)abc>0 (2)4ac-b2<0 (3)4a+2b+c<0 (4)2a-b=0
A.(1)(2)(3) | B.(1)(3)(4) | C.(1)(2)(4) | D.(2)(3)(4) |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐2】已知抛物线
(
、
、
为常数,且
)的对称轴为
,与
轴交于
、
两点,若
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.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/98ec3d75e53b990bc8f9a4622928dd21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b583230a32b774445332490c511989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79303098aa255f4bf321752a5ad9bbc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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