已知二次函数
(a,b,c为常数,且
)的图象如图所示,其对称轴为直线
,且经过点
,给出下列结论:①
;②
;③
;④
(m为任意实数),正确的个数是( )
![](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/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4fd84394e897ebf6c4814b841d427b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77694c11ba40ec5c2fc4f6a05e31a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc20d351d51723c9b0a07a20ac14114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5469918fc2803d9d5b2951b3296fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452e47d4926e87c332bdecdd6a8caafa.png)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2024-05-09 14:35:41
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【推荐1】若抛物线y=x2-bx+8的顶点在x轴的负半轴上,则b=( )
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【推荐2】如图,以
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【推荐1】已知二次函数
,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf2f46bc120e5b6f8317b02370bffbb.png)
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【推荐2】已知二次函数
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/2dec0b57-e72b-4507-b773-e87a6ba58d6e.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/2dec0b57-e72b-4507-b773-e87a6ba58d6e.png?resizew=123)
A.![]() ![]() | B.该函数的图象关于直线![]() |
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【推荐1】二次函数
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/2e475b5f-06fe-41a3-b2ea-8bdf52b0142f.png?resizew=116)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978921b876755d94bebf28c3425e7f46.png)
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【推荐2】如图,抛物线
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①
;
②
;
③当
时,y随x的增大而增大;
④关于x的一元二次方程
有两个不相等的实数根.其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb442fb1fe1a5d9768cf11c3e1b7ec5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4944b18a1daae0480089124e5551107f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd2336e50c0afb3e8e73a6ea9070ded.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
④关于x的一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
A.①②③④ | B.①②③ | C.①③④ | D.②③④ |
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