在研究函数图形的性质时,若将自变量x变为
,则函数图象变化为:保留y轴右侧的图象,y轴左侧的图象为右侧图象关于y轴的成轴对称图形.已知抛物线y=﹣x2+2x+3的图象,则对于
,当y>0时,x的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc51e97939a8966daa015535a801561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad6d80d14e6a8a09a60ca440156c39.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-10-25 20:16:12
|
相似题推荐
单选题
|
较难
(0.4)
名校
【推荐1】已知点
为抛物线
(m为常数,m>0)上的两点,当
时,( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fbd87572ca02d3697f1bf965e4282a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479f6cda65853f3a14ca25fe502cd8a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e71b58e2b0b91ca8385ac0b531f0ce.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】如图,抛物线
交x轴于点
和
,交y轴于点C,抛物线的顶点为D,下列四个命题:①当
时,
;②若
,则
;③抛物线上有两点
和
,若
,且
,则
;④点C关于抛物线对称轴的对称点为E,点G、F分别在x轴和y轴上,当
时,四边形
周长的最小值为
.其中正确的有( )个
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847561963839488/2850299699552256/STEM/862f56ec-52d7-4116-9c62-e707d4717953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efc5cc28180d1e8d7faaa2717f02a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5612d598e27ac2ce0ab89fb63538bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6f5adf13b4214666292dd64b947741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af405a054bfe7fb7ce40e48d816467e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4378ddbb895755fb1d06e10fbcdeb065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ca13a93b5f401c0d39ba52b0cffcb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ae006f399a4b83fb384de288c860b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53f134cd142e3b62e37cad0e7411e8d.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847561963839488/2850299699552256/STEM/862f56ec-52d7-4116-9c62-e707d4717953.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】已知方程
的其中一个实数根x满足
,则a的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68e77dd03b17d19a5a23aa4e816d679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7511e6ce72a5232820b7007f976be9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次