如图,抛物线
和直线
都经过点
,抛物线的对称轴为
,那么下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/4c0ed18f-c3c1-4819-a2f8-0beee5cb4a57.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/4c0ed18f-c3c1-4819-a2f8-0beee5cb4a57.png?resizew=166)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
更新时间:2023-04-04 16:17:56
|
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适中
(0.65)
【推荐1】二次函数
,当
时,
随着
的增大而增大,当
时,
随着
的增大而减小,则
的值应取( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23a439cbbaf3b5b1a208a9af37e0a17.png)
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A.12 | B.11 | C.10 | D.9 |
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【推荐2】抛物线
交x轴于
,
,交y轴的负半轴于C,对称轴与抛物线交于点D.根据以上信息得出下列结论:①
;②
;③
;④当
时,y的值随x值的增大而减小;⑤当
时,
;其中结论正确的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810961de0c2c5174c5be32e8e5b4bf21.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060e7930731eddbcfac592b808e9b698.png)
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A.5 | B.4 | C.3 | D.2 |
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【推荐1】如图,二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A(1,0),对称轴为直线x=-1,下列结论:①abc>0;②b2-4ac>0;③a-b+c<0;④函数图象经过点(-3,0);⑤8a+c>0.其中,正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/1/4/2628706744401920/2630184941633536/STEM/414ba218-b7a8-4e19-bc14-4ea83f85e53d.png?resizew=191)
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【推荐2】二次函数
的图象如图所示,如下结论:①
;②
;③
;④
;⑤
为任意实数);其中正确个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐1】对于实数
,定义符号
,其意义为:
.例如:
,若关于
的函数
则使该函数的最大值小于0时
的范围是( )
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【推荐2】已知抛物线
,现将其图象向上平移
个单位得到抛物线
,当
时,若抛物线
与直线
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的取值范围是( )
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