已椭圆
与双曲线
有相同的焦点
和
,若c是a、m的等比中项,n2是2m2与c2的等差中项,则椭圆的离心率e =
![](https://img.xkw.com/dksih/QBM/2010/12/24/1569945349447680/1569945354584064/STEM/a25036ed8f394bd0a9b9f1b55e4bfff8.png)
![](https://img.xkw.com/dksih/QBM/2010/12/24/1569945349447680/1569945354584064/STEM/b69d6f9612114c938e5b6ea6f8cfe5b3.png)
![](https://img.xkw.com/dksih/QBM/2010/12/24/1569945349447680/1569945354584064/STEM/5a3fda225ae247159b982b0ba8b8a010.png)
![](https://img.xkw.com/dksih/QBM/2010/12/24/1569945349447680/1569945354584064/STEM/a2c461eaf0674a6a99a77b4b00859cc0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
10-11高三上·重庆万州·阶段练习 查看更多[2]
更新时间:2016-11-30 12:04:54
|
相似题推荐
单选题
|
适中
(0.65)
解题方法
【推荐1】若等差数列
的前15项和
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d799987e7af9561215baf4f99c7777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e22c96a886dfccddaa92f4e74bcd4e.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
单选题
|
适中
(0.65)
真题
名校
【推荐2】若 是函数
的两个不同的零点,且
这三个数可适当排序后成等差数列,也可适当排序后成等比数列,则
的值等于
A.6 | B.7 | C.8 | D.9 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】若
成等差数列,
成等比数列,且
,则m 的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe02dfcb1b6adb1c1829cf45a0a6b0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b352f2e3f55b367777f6d8ff08e23a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1d7b46177c402d8cbdb0cf4217e562.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】设
,
,
,则数列![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8260371062c4480a2e7876750fe7ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22088e20d6a5fd331d0315df458eba6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ab150c1ff826c8d961591ddf67abb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
A.是等差数列,但不是等比数列 | B.是等比数列,但不是等差数列 |
C.既是等差数列又是等比数列 | D.既非等差数列又非等比数列 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】已知O为坐标原点,F是椭圆C:
的左焦点,A,B分别为C的左,右顶点.P为C上一点,且PF⊥x轴.过点A的直线l与线段PF交于点M,与y轴交于点E.若直线BM经过OE的中点,则C的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】在平面直角坐标系
中,点
为椭圆
:
的下顶点,
,
在椭圆上,若四边形
为平行四边形,
为直线
的倾斜角,若
,则椭圆
的离心率的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c9bebea391a1f9956dfcca98d9d1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0402c7e8ed10c0d1c56c318fb58e69b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134da94cd2c883072ec1b38979d497aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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1】双曲线
:
的两个焦点分别是
与
,焦距为8,
是双曲线上的一点,且
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc111f02ab51653820180a5d5ae740ee.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27ad0481b4eba360acafcc03919d4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2675e721a547386255bae4dfdca9ff2.png)
A.9 | B.9或1 | C.1 | D.6 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】已知命题
:椭圆
与双曲线
有相同的焦点;命题
:函数
的最小值为
.下列命题为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2473f6794614494af42cb44bd8003b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5376456debba41d7ad2a74566ff292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5646728bae56defee04ae39da44234a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次