椭圆
的中心、右焦点、右顶点、右准线与
轴的交点依次为
,则
的最大值为
![](https://img.xkw.com/dksih/QBM/2016/11/15/1573148011216896/1573148017082368/STEM/97fbadd1eb0e4930a4a1abc6ef961a86.png)
![](https://img.xkw.com/dksih/QBM/2016/11/15/1573148011216896/1573148017082368/STEM/fb5a000a0aab425eaa3c931cd1cd9529.png)
![](https://img.xkw.com/dksih/QBM/2016/11/15/1573148011216896/1573148017082368/STEM/92fffd85ae404dc5bc124fdee86f86a1.png)
![](https://img.xkw.com/dksih/QBM/2016/11/15/1573148011216896/1573148017082368/STEM/643405d18e7f4f4289ac419a8780d865.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2016-12-05 00:40:44
|
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】椭圆
的左、右焦点分别为
、
,动点A在椭圆上,B为椭圆的上顶点,则
周长的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff86e85e4d467091f2fa73018e23a1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eb2485f90dbfd0dfd6e7d179a856f5.png)
A.8 | B.10 | C.12 | D.16 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】已知椭圆:
,左、右焦点分别为
,过
的直线
交椭圆于
两点,若
的最大值为5,则
的值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94752acb1abb015f22ed6918feeff75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03662f995c29782fc627dbd61fc5fcfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.1 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】已知点
在离心率为
的椭圆
上,
是椭圆的一个焦点,
是以
为直径的圆
上的动点,
是半径为2的圆
上的动点,圆
与圆
相离且圆心距
,若
的最小值为1,则椭圆
的焦距的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0fe9059acc47d2447576e1260c4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f627db99a5aa6cf46c7955198a2513de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
解题方法
【推荐2】已知椭圆C:
的右焦点为F,点
在椭圆C上,若点Q满足
且
,则
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e78f1a9cc4dedc05c175ab99b288b9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891d562a1b7794444cb41dfaae849cda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3097d1dc304f5f5d00ee6c12525e90f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9078e5a3c2ca24a0a6f0b67dd83560.png)
A.3 | B.![]() | C.![]() | D.1 |
您最近一年使用:0次