如图是二次函数
的部分图象,图象过点
,对称轴为直线
,给出四个结论:①
;②
;③
;④若点
、
为函数图象上的两点,则
,其中正确结论是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936d27619351384148d7858b63fd25ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1beec07792cbfc2f46de2aa151c5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548b9ad3eb85faebb0944c5ba2f65480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0735b3b364fbcbcdda91656e20f95c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/d10898f3-82b8-4080-a069-82a0007b6067.jpg?resizew=140)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-09-14 19:50:47
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【推荐1】已知y关于x的函数表达式是
,下列结论不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120b0e988543adc16ebb83b3b31fb9e3.png)
A.若![]() |
B.若![]() ![]() |
C.无论a为何值时,函数图象一定经过点![]() |
D.无论a为何值时,函数图象与x轴都有两个交点 |
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【推荐2】如图是二次函数
的图象,对于下列说法,其中正确的有( )
①
,②
,③
,④
,⑤当
时,y随x的增大而减小,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/314e3c9c-c529-45c0-a8c4-8fc944a2188b.png?resizew=120)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f2e8b5365c2f086a02e5dd3c3bd116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbc6fbdb7a42c4f3f63ce6424e2eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f258e2481aa0a861dde26dfbcf685cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31d3ff0489fd0dec060f5f1cc30117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/314e3c9c-c529-45c0-a8c4-8fc944a2188b.png?resizew=120)
A.5个 | B.4个 | C.3个 | D.2个 |
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【推荐1】若一个点的坐标满足
,我们将这样的点定义为“倍值点”.若关于
的二次函数
(
为常数,
)总有两个不同的倍值点,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0288ee1a3fc67fc212357e0141e5f839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17fd27e75ba059ece25ce82054d6704c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b056a90a2751f04ba5fff3dc5c1d0674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b87097b2cf9cfc7ed13edc403d7e072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知二次函数
的图象如图所示,下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/b1d67390-d720-4841-a3d0-085c7e3c7cb6.png?resizew=199)
①
; ②
; ③
; ④
.
其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/b1d67390-d720-4841-a3d0-085c7e3c7cb6.png?resizew=199)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d5337a4bbce4c01855eb6df673e236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3893badb238dd11cfd88f87dffe425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9deb79d044a379f31a8fc57736d7ead.png)
其中正确的个数是( )
A.1 | B.2 | C.3 | D.4 |
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