若二次函数
的图像如图所示,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/3/18/2163011010625536/2163363920125952/STEM/396e76b2a6ab404b9c6d6d7e311baba7.png?resizew=117)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://img.xkw.com/dksih/QBM/2019/3/18/2163011010625536/2163363920125952/STEM/396e76b2a6ab404b9c6d6d7e311baba7.png?resizew=117)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2019-03-18 21:58:04
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【推荐1】若二次函数
(a是不为0的常数)的图象与x轴交于A、B两点.下列结论:
①
;
②当
时,y随x的增大而增大;
③无论a取任何不为0的数,该函数的图象必经过定点
;
④若线段AB上有且只有5个横坐标为整数的点,则a的取值范围是
.
其中正确的结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38a9b44fe3a3a6693fbc7b494c22ef4.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc3e5be1796493161a4df7e28a6f6b7.png)
③无论a取任何不为0的数,该函数的图象必经过定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76095b03d243fead89a6493614e4b68a.png)
④若线段AB上有且只有5个横坐标为整数的点,则a的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5ec6df6afd07961e9c254614ca8d12.png)
其中正确的结论是( )
A.①②③ | B.②④ | C.①③ | D.①③④ |
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【推荐2】小潘同学在1000米训练中跑动的路程S(米)与时间t(分钟)的关系如图所示,则他跑步速度大小v(米/分钟)与时间t(分钟)的关系图象为( )
![](https://img.xkw.com/dksih/QBM/2020/4/6/2435502013857792/2435559487012864/STEM/5961412f-182a-4a24-bde9-2f69cc5fa18e.png?resizew=352)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】关于抛物线
,下列判断正确的个数是( )
(1)图象开口向上 (2)图象对称轴是直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb489e91a4b601413959b0954531df8.png)
(3)图象与
轴没有交点 (4)当
时,
随
增大而减小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856e2db1766259f31027cb7e10736483.png)
(1)图象开口向上 (2)图象对称轴是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb489e91a4b601413959b0954531df8.png)
(3)图象与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f3fbf3d1a9dc34ca087553710fe838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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名校
【推荐2】如图,抛物线
的对称轴为直线
,与x轴的一个交点坐标为
,其部分图象如图所示,下列结论:①
,②方程
有两个实根;③
;④当
时,x的取值范围是
;⑤当
时,y随x增大而增大.其中结论正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2022/2/15/2923235729301504/2933088466132992/STEM/519fe403-5e65-47cb-804b-5a5b99137e89.png?resizew=168)
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A.4个 | B.3个 | C.2个 | D.1个 |
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