一元二次方程
的两个根分别为
和
,则二次函数
的对称轴是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-09-18 14:15:39
|
相似题推荐
单选题
|
较易
(0.85)
【推荐1】已知一元二次方程
的两根分别为
,
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1be2535ea3191ce13a537e12f2c68c.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/73c918ca5d4e6d46ed130f85e5fa608d.png)
A.![]() | B.5 | C.10 | D.13 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】已知方程
的两个解分别为
, 则
的值分别是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9252a224631fd499831dd49f27f6e42c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a6309e9a014da38aa6e344f35485e2.png)
A.3,-8 | B.-3,-8 | C.-3,8 | D.3,8 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐1】设
,
,
是抛物线
上的三点,则
,
,
的大小关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b335385838979e1744cb32542004c04f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3316464faa4c460d8ea308c194667a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6afd8dfd16037fef73fd77b7208d2bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e8a2c385b4b018aab0456557e26896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】对于二次函数y=2(x+1)(x﹣3),下列说法正确的是( )
A.图象过点(0,﹣3) | B.图象与x轴的交点为(1,0),(﹣3,0) |
C.此函数有最小值为﹣6 | D.当x<1时,y随x的增大而减小 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐1】抛物线
与
轴相交于点
,若点
在抛物线上,且
,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df7fcf82e3fac415783957d0f17448f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf49c761760a084725ce8fee4a670373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb8cc06b20b348074dff9bbab5abb32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】抛物线y=(x-4)(x+2)的对称轴方程为( )
A.直线x=-2 | B.直线x=1 | C.直线x=-4 | D.直线x=4 |
您最近一年使用:0次