抛物线
的对称轴为直线
,部分图象如图所示,下列判断中:①
;②方程
的两个根是
,
;③当
时,y的值随x增大而增大;④若点
,
均在抛物线上,则
,其中正确的判断是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/f386b02d-bb4c-4589-868d-937d20d43764.png?resizew=121)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb35c769007b54a0204e85a0e5223bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb61efbde7a80cdc34c3d5af533ad6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4360ba97244edef80ee3ebb24110e023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1292c47f62023b747f1a4bd615c75284.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/f386b02d-bb4c-4589-868d-937d20d43764.png?resizew=121)
A.①②③④ | B.②③④ | C.②③ | D.②④ |
更新时间:2024-02-25 15:34:37
|
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【推荐1】已知:点B(﹣2,3),C(2,3),若抛物线l:y=x2﹣2x﹣3+n与线段BC有且只有一个公共点,若n为正整数,确定所有n的值.“甲的结果是n=7,乙的结果是n=1或2,丙的结果是n=3或4或5”,则( )
A.甲的结果正确 | B.乙的结果正确 |
C.丙的结果正确 | D.甲、乙、丙的结果合在一起正确 |
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【推荐2】如图,在平面直角坐标系
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,与x轴的一个交点为
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A.![]() |
B.![]() |
C.不等式![]() ![]() |
D.![]() |
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【推荐1】如图,已知二次函数
的图象如图所示,对于下列结论:其中正确结论的个数是( )
①
;②
;③
;④
;⑤方程
的根是
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/45a36ddf-0f91-4191-923d-8d7ca2678c01.png?resizew=155)
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375386102cba5bfd93bdf340216eb22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4dd16c50c2b51ab61fd00b9a0df97a.png)
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A.2 | B.3 | C.4 | D.5 |
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【推荐2】如图是二次函数
图象的一部分,
是对称轴,有下列判断:①
;②
;③
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;其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/731b6d46-9cc0-47a9-b867-2b9a3d89ecee.png?resizew=122)
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单选题
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适中
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【推荐1】已知抛物线
的部分图象如图所示,若
,则
的取值范围是( )
![](https://img.xkw.com/dksih/QBM/2020/1/14/2376794089193472/2377020301828096/STEM/0137beb9510e43c5a8f62c87b95f7dc3.png?resizew=143)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】二次函数
的图像如图所示,现有以下结论:①
;②
;③
;④
;其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
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名校
【推荐1】二次函数
的图象如图所示,下列说法正确的个数有( )
①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5f0d374837655cc286d326305da36.png)
③
④方程
有两个不相等的实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5f0d374837655cc286d326305da36.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608b47f4f37ab10c00f0b2f8f3b65ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7de656bfe40e941caec9cd77ef01f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/0e2c2f3c-626d-4851-a0a0-ebb33466a32a.png?resizew=175)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐2】在平面直角坐标系中,二次函数
的图像如图所示,现给出下列结论:①
且
;②
;③
;④
;⑤方程
的两根之和为-4,其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/39ff9648-3bbd-4370-bff8-d70dd1f492e0.png?resizew=136)
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