如图,二次函数
的顶点为D,其图象与x轴的交点A,B的横坐标分别为
和3.下列结论:①
;②
;③
;④当
时,
是等腰直角三角形.其中结论正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbcf3f7721240b8d2161f8c66a0fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31d3ff0489fd0dec060f5f1cc30117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/2041359f-ee6c-4321-ad72-15fa333e1339.png?resizew=120)
A.4个 | B.3个 | C.2个 | D.1个 |
更新时间:2023-11-10 08:49:23
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【推荐1】如图是二次函数
(a,b,c是常数,
)图象的一部分,与x轴的交点在点
和
之间,对称轴是
.对于下列说法:①
;②
;③当
时,
;④
.其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0573e2af8a0dc8c6a1c0af067a324f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb442fb1fe1a5d9768cf11c3e1b7ec5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ed37ee7432002cd0e0978b2012e184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbcf3f7721240b8d2161f8c66a0fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b843858ba23012c724dea0c51d54a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea840f210f9b5b839edb5d34ee2a4f83.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,若二次函数y=ax2+bx+c(a≠0)图象的对称轴为x=1,与y轴交于点C,与x轴交于点A、点B(﹣1,0),则
①二次函数的最大值为a+b+c;
②a﹣b+c<0;
③b2﹣4ac<0;
④当y>0时,﹣1<x<3,其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/23/7c5d0c04-69ec-4f51-8a40-ac24d97fc5c5.png?resizew=157)
①二次函数的最大值为a+b+c;
②a﹣b+c<0;
③b2﹣4ac<0;
④当y>0时,﹣1<x<3,其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/23/7c5d0c04-69ec-4f51-8a40-ac24d97fc5c5.png?resizew=157)
A.1 | B.2 | C.3 | D.4 |
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【推荐1】如图为二次函数
的图象,直线
与抛物线交于
,
两点,
,
两点横坐标分别为
,
,根据函数图象信息有下列结论:①
;②
;③
;④若对于
的任意值都有
,则
;⑤当
为定值时,若
变大,则线段
变长,其中,正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/fe194016-819b-43c9-9426-c7e0425995bc.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6972fd1bf19b7d78a68c47c4e47fd0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f371d431b6c91972b742c426c8a81ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa204d6b5183969f6da37f369eb7293d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa204d6b5183969f6da37f369eb7293d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ede78fd7ac619ea597856254bb5d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/fe194016-819b-43c9-9426-c7e0425995bc.png?resizew=160)
A.①②④ | B.①③⑤ | C.①②⑤ | D.①② |
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【推荐2】如图是二次函数y=ax2+bx+c图象的一部分,其对称轴是直线x=﹣1,且过点(﹣3,0),下列说法:①abc<0;②2a﹣b=0;③4a+2b+c<0;④若(﹣5,y1),(
,y2)是抛物线上两点,则y1<y2,其中说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/f99479aa-6077-4a9b-b8ab-737fadb0947e.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9658fb1429b9378cdeb5316778391c48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/f99479aa-6077-4a9b-b8ab-737fadb0947e.png?resizew=185)
A.①② | B.②③ | C.①②④ | D.②③④ |
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【推荐1】已知二次函数
的图象经过点
,
,
,
,则下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf2fafe22d2db8d64292e3d9e8489bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0956c2c605a44856720311af02bfbc69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6498fb884498eca1c401f205c70774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda24d2f7d64bc2bfe1ed48a38b29954.png)
A.![]() | B.![]() |
C.方程 ![]() ![]() | D.对于任意实数t,总有 ![]() |
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【推荐2】如图,二次函数
的图像与
轴负半轴交于点
,对称轴为直线
.以下结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/269282ec-bad9-47c5-96f8-57fbf631b774.png?resizew=172)
①
;②
;③若点
,
,
均在函数图像上,则
;④若方程
的两根为
,且
,则
.其中正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482ad28bbcbe8b8d384d84851a54386b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/269282ec-bad9-47c5-96f8-57fbf631b774.png?resizew=172)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da04f641c850a75a63031d5aed2e0625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89dcb1c0e68f7887f8a3c28f11f57d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c6ed236771095c437627c5b8cc3493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212b9cbcfd8dc40a895a602158428407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf6654ca641d9de5ff38d03190a2987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6dd0324ea20f0dfd340605eb115aaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff60eab72de85437e12806474281612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27caef2892d30c03803ab08d7b3fa055.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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