如图,二次函数
的图象与
轴交于点
,与
轴的交点
在
与
之间(不包括这两点),对称轴为直线
.下列结论:①
;②
;③若点
,点
是函数图象上的两点,则
;④
其中正确结论有( )
![](https://img.xkw.com/dksih/QBM/2020/12/22/2626023539597312/2633734724091904/STEM/7b5b2cd0-bab0-4db4-8ee9-9c26be7c10ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f78990189dfd3c922b7738d78de42da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847006f13dfaa07f2e4769f417730e5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57095c312ecddc14a3772cbca60dd80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b328c1238247d63267502438331d369d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/22/2626023539597312/2633734724091904/STEM/7b5b2cd0-bab0-4db4-8ee9-9c26be7c10ed.png)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2021-01-11 03:29:55
|
【知识点】 根据二次函数的图象判断式子符号解读
相似题推荐
单选题
|
适中
(0.65)
【推荐1】抛物线
(
,
,
为常数,
)经过点
,
两点,下列五个结论:其中正确的结论有几个( )
①一元二次方程
的两个根为
,
;
②若点
,
在该抛物线上,且
,
,则
;
③若点
在抛物线上,则
;
④
;
⑤对于
的每一个确定值,若一元二次方程
(
为常数,
)的根为整数,则
的值只有两个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976968bee12bcb50dea41b49fea8461c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc3cef5d561ecb15df0d36d8c0e077b4.png)
①一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0736457346c11dd6f458418a4f747ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb35c769007b54a0204e85a0e5223bd.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa86e5134bf9fa5e0a759fa51115437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8baa9b0c81bdd4d03d17dd85df23916a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cd9af362cd03aca8cc82a6c8491492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
③若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736db56d00b4e51c8a77460f9c759324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456ee658db291d224dc8cbdffe9814cf.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdffe79a6d7afd83ed914157e618e2df.png)
⑤对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a2dad4e1968586bd34415bb3a67e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abd313d4e92a762fb7fb0c1cb65263d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
A.2 | B.3 | C.4 | D.5 |
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单选题
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适中
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【推荐2】已知二次函数y=ax2+bx+c(a,b,c是常数,a≠0)图象的对称轴是直线x=1,其图象的一部分如图所示,下列说法中①abc<0;②2a+b=0;③当﹣1<x<3时,y>0;④2c﹣3b<0.正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2019/6/3/2217498701348864/2218859476434944/STEM/ae44795c634c45de8e28427f8bf15448.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/2019/6/3/2217498701348864/2218859476434944/STEM/ae44795c634c45de8e28427f8bf15448.png?resizew=121)
A.①② | B.②③④ | C.①③ | D.①②④ |
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