在平面直角坐标系中,已知二次函数
(对称轴为
)的图象如图所示,有下列结论:
;
;
;
.其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/56194cbe-f89d-4995-be68-6b71f306da09.jpg?resizew=119)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238b0bdd3afab8fce6e40c7da1548936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6d65442c008fd18b52e07e2904392e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa8b7ee4fe8fbf7d7575cda6abf417d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f7997c836f434f10ddf01c71fac510.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/56194cbe-f89d-4995-be68-6b71f306da09.jpg?resizew=119)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-17 22:29:53
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【推荐1】二次函数y=ax2+bx+c的图象如图所示,它与x轴交于点(1,0),则化简二次根式
的结果是( )
![](https://img.xkw.com/dksih/QBM/2015/7/30/1573891027730432/1573891033251840/STEM/7bfed1c724eb4bca8374fb5ce033f49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d28a78e603c359ff31e4f8b13fffc2.png)
![](https://img.xkw.com/dksih/QBM/2015/7/30/1573891027730432/1573891033251840/STEM/7bfed1c724eb4bca8374fb5ce033f49f.png)
A.a+b | B.-a-b | C.a+3b | D.-a-3b |
您最近一年使用:0次
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名校
【推荐2】如图是二次函数
的图像,有下列结论:①
;②
;③
;④
;⑤
其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2022/12/3/3123003745984512/3132010081624064/STEM/14cced66fabd4bd0bfe74b2bacee25ce.png?resizew=168)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5f0d374837655cc286d326305da36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31d3ff0489fd0dec060f5f1cc30117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6103edfd3657a1185363ba50a45ed43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9c39b3fef1f1ecbd31627cd9696429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8a56c1192a5d34bee8f158d9bba69e.png)
![](https://img.xkw.com/dksih/QBM/2022/12/3/3123003745984512/3132010081624064/STEM/14cced66fabd4bd0bfe74b2bacee25ce.png?resizew=168)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】如图是二次函数
的部分图象,其顶点坐标为
,且与x轴的一个交点在点
和
之间,则下列结论:①
;②
;③
;④一元二次方
有两个不相等的实数根;⑤
,其中正确( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3ada1001-75cb-4f2b-8602-f5a577ce9208.png?resizew=225)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ae2bdb471fa72711d959d70c6b5652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dda5bbebcf292501b548c8f2e0da428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e2fb818b15dcd2e3a548e23d39502a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea781875e43a5d70942f6e258054572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68ff94b0877adb96abbc3e0fa52d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5b998c9460ba85a821126ff2b72d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601f691c260c95031b8f8812cb2f4bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5d55b3906494569b9aef9e5afc059f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea840f210f9b5b839edb5d34ee2a4f83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3ada1001-75cb-4f2b-8602-f5a577ce9208.png?resizew=225)
A.①②③ | B.①③④⑤ | C.①④ | D.②③⑤ |
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【推荐2】已知二次函数y=ax2+bx+c(a≠0)的图象如图所示,有下列4个结论:①abc>0;②b<a+c;③4ac﹣b2>0;④2a+b=0,其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109543564206080/2111218654314496/STEM/655aff76f0424b7faae159478ea33b22.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109543564206080/2111218654314496/STEM/655aff76f0424b7faae159478ea33b22.png?resizew=116)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
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适中
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【推荐1】如图,若二次函数
的图象的对称轴为
,与x轴的一个交点为
,则:①二次函数的最大值为
;②
;③当
时,y随x的增大而增大;④当
时,
,其中正确命题的个数是( )
![](https://img.xkw.com/dksih/QBM/2020/7/23/2511995303149568/2513082353737729/STEM/61c415c8-52ec-49fc-b188-9ea01631b2ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae24688d4c45aad43e9af0b7bbfda6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd2336e50c0afb3e8e73a6ea9070ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b843858ba23012c724dea0c51d54a3.png)
![](https://img.xkw.com/dksih/QBM/2020/7/23/2511995303149568/2513082353737729/STEM/61c415c8-52ec-49fc-b188-9ea01631b2ff.png)
A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图,二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A、B两点,与y轴交于点C,对称轴为直线x=﹣1,点B的坐标为(1,0),则下列结论:①AB=4;②b2﹣4ac>0;③ab<0;④a2﹣ab+ac<0,其中结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863825285029888/2864734448041984/STEM/3fc0b29a-a32f-48d5-a53a-236bdc483185.png?resizew=160)
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863825285029888/2864734448041984/STEM/3fc0b29a-a32f-48d5-a53a-236bdc483185.png?resizew=160)
A.①②③ | B.①③④ | C.①②④ | D.②③④ |
您最近一年使用:0次
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【推荐1】如图二次函数
的图象经过点
且与x轴交点的横坐标分别为
,
,其中
,
,下列结论:
,
,
,
,其中结论正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/ff192cf2-d208-450c-ab72-2539b01d0bde.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449d889f86f72648bd08f46916cb4915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781b089662bf214668aae489bda55497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5ffa21fddc7c55d35f13435792b2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96e97805f0853d6f994f0fad3b5aa05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b76bb486cf5587fd47d275ef989373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2256953ae79cb5ccb421c3c4ceec15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e9caa41edc5b2b2e2f5e56807ea394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e022a52126df88ec809f1369e53e7f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/ff192cf2-d208-450c-ab72-2539b01d0bde.png?resizew=144)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
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【推荐2】二次函数
的图像如图所示,对称轴是直线
,下列结论:①
;②
;③
;④
.其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.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/375386102cba5bfd93bdf340216eb22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/792cc60b0a2d5e3f5ca98781b2a82922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a395a7795e783b4596bef9775d02ed6f.png)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次