已知椭圆
的离心率为
.
(1)求椭圆的标准方程;
(2)当焦点在y轴上时,A、B是椭圆与x轴的交点,
是椭圆上异于A、B的任意点,
、
分别是PA、PB的斜率.求证:
是定值.当
时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1cb3e9f0e345fc8b59ddf03db472d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
(1)求椭圆的标准方程;
(2)当焦点在y轴上时,A、B是椭圆与x轴的交点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7775aa57ca0e62216f3039ed88dceed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a88585b01bf82d7e42202b0121ead27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
更新时间:2023-03-02 22:51:54
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相似题推荐
解答题-证明题
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【推荐1】已知椭圆
的离心率为
,且过点
,A,B分别为椭圆E的左,右顶点,P为直线
上的动点(不在x轴上),
与椭圆E的另一交点为C,
与椭圆E的另一交点为D,记直线
与
的斜率分别为
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740933297233920/2740970709590016/STEM/3f18e90c-2a8f-45a1-a2e8-23e451006f49.png?resizew=232)
(Ⅰ)求椭圆E的方程;
(Ⅱ)求
的值;
(Ⅲ)证明:直线
过一个定点,并求出此定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef233ad3db01fa3ce9ee94eaad8e64e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740933297233920/2740970709590016/STEM/3f18e90c-2a8f-45a1-a2e8-23e451006f49.png?resizew=232)
(Ⅰ)求椭圆E的方程;
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67351fe10fcfc3f9072eec4c60bfaaa5.png)
(Ⅲ)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】已知椭圆C:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
的左、右焦点分别为
,离心率为
,P为椭圆C上的一个动点.当P是C的上顶点时,△
的面积为
.
(1)求椭圆C的标准方程;
(2)设斜率存在的直线
与C的另一个交点为Q,是否存在点
,使得
?若存在,求出t的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434249d6640b0c1a712d215cf8b83d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8a7029669bf1774a24f3ef6273ca88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
(1)求椭圆C的标准方程;
(2)设斜率存在的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0739793f234f8e86adc6177801ae7295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4c22ee184228342fb28ff7706ea175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fc86d4dac951dac1ebbb3c0ad41c6a.png)
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【推荐1】已知椭圆C:
的离心率为
,直线
交椭圆C于A、B两点,椭圆C的右顶点为P,且满足
.
(1)求椭圆C的方程;
(2)若直线
与椭圆C交于不同的两点
、
,线段MN的中点为
,且定点
,满足
,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634e4f0278d54cb09baee21962d24079.png)
(1)求椭圆C的方程;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4728be08001804ddf3f5df6b4ad9954e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8198c3b302b3820e86763428eb1e91cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3463ced6030af957f13f9ba05b977c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c77f0fe2091c394833fd083601736b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f57faedc199cba55a1537db20a0cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af79b0caba85d4df445c63ae1800b910.png)
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【推荐2】定义:由椭圆的两个焦点和短轴的一个端点组成的三角形称为该椭圆的“特征三角形”.如果两个椭圆的“特征三角形”是相似的,那么称这两个椭圆是“相似椭圆”,并将“特征三角形”的相似比称为椭圆的相似比.已知椭圆C1:
+y2=1,椭圆C2与C1是“相似椭圆”,且椭圆C2的短半轴长为b.
(1)写出椭圆C2的方程;
(2)若在椭圆C2上存在两点M,N关于直线y=x+1对称,求实数b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de95471bb6c16acb4fd84d8315e6a637.png)
(1)写出椭圆C2的方程;
(2)若在椭圆C2上存在两点M,N关于直线y=x+1对称,求实数b的取值范围.
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【推荐1】已知椭圆
:
(
)的离心率为
,
是椭圆
的左,右焦点,点
是椭圆上任意一点且满足
.
(1)求椭圆方程;
(2)设
为椭圆右顶点,过点
的直线
与椭圆
交于
,
两点(异于
),直线
,
分别交直线
于
,
两点.求证:
,
两点的纵坐标之积为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f595683f69d5d6b5ca76408b0ff6ff17.png)
(1)求椭圆方程;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09245fd7604997221b9a1a6e8fb752f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a8c60eb762b0951c61153fc17ba91b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐2】已知椭圆
的左右顶点分别为
,椭圆
上不同于
的任意一点
,直线
和
的斜率之积为
.
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650929514004480/2652141023166464/STEM/433921c5-bd52-4b97-ae99-dd5319ffb5ad.png?resizew=260)
(1)求椭圆
的标准方程;
(2)过椭圆内一点
,作一条不垂直于
轴的直线交椭圆于
两点,点
和点
关于
轴对称,直线
交
轴于点
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d72a07a4e5acfc140a3cea1f26b951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/728b3360d5c6394457b907f1cbc31a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650929514004480/2652141023166464/STEM/433921c5-bd52-4b97-ae99-dd5319ffb5ad.png?resizew=260)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过椭圆内一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a758f5f679810a247319fa8162c113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432aae51854129e8c10f7c34c0c3a79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb74ca8fc86ddef279e33f31c1fedda.png)
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