名校
1 . 若曲线
与直线
始终有交点,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7776f8179bc04afd0574c9019945e922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2013·浙江·一模
2 . 过椭圆
左焦点
且不垂直于x轴的直线交椭圆于A、B两点,AB的垂直平分线交x轴于点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de93800a794d2bce592d3562fe5c398d.png)
______ ;
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571814109962240/1571814115516416/STEM/a363b28c025f43d0866f0947ac76b5d6.png?resizew=81)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de93800a794d2bce592d3562fe5c398d.png)
您最近一年使用:0次