如图,抛物线
与
轴交于点
和
,与
轴交于点
,下列结论:①
,②
,③
,④
,其中正确的结论个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0949ce24c868813dfba767b6fb277538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5469918fc2803d9d5b2951b3296fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a395a7795e783b4596bef9775d02ed6f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-04-09 07:23:54
|
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【推荐1】已知抛物线y=ax2+bx+c(a≠0)的对称轴为直线x=2,与x轴的一个交点坐标为(4,0),其部分图象如图所示,下列结论:
①抛物线过原点;②a﹣b+c<0;③当x<1时,y随x增大而增大;
④抛物线的顶点坐标为(2,b);⑤若ax2+bx+c=b,则b2﹣4ac=0.
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2018/11/30/2086466732982272/2088828082208768/STEM/5adbaa2e7e7d432f91e05cb2df06ba56.png?resizew=164)
①抛物线过原点;②a﹣b+c<0;③当x<1时,y随x增大而增大;
④抛物线的顶点坐标为(2,b);⑤若ax2+bx+c=b,则b2﹣4ac=0.
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2018/11/30/2086466732982272/2088828082208768/STEM/5adbaa2e7e7d432f91e05cb2df06ba56.png?resizew=164)
A.①②③ | B.①④⑤ | C.①②④ | D.③④⑤ |
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【推荐2】在同一平面直角坐标系中,反比例函数y
(b≠0)与二次函数y=ax2+bx(a≠0)的图象大致是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99db75e95d4531e80ead9cc7c0108605.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】二次函数
的部分图像如图所示,图像过点
,对称轴为
,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/e5fbb74e-e514-4141-a57c-688cc7a2f4b2.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/e5fbb74e-e514-4141-a57c-688cc7a2f4b2.png?resizew=183)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知抛物线
的对称轴为直线
,与
轴的一个交点为
,其部分图象如图所示.下列结论①
;②
;③
;④抛物线的顶点为
;⑤当
时,
随
的增大而减小.其中正确的有( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/413ed186-046f-4018-8a53-729c19353535.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ecda7bfb0a2043306bf7707a136ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0ffac9bb8ac8c26a81e103995cdcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d42e4e9b8110621bdc971b4b91ae2c.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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