(Ⅰ)计算:
①若
是椭圆
长轴的两个端点,
,则
______;
②若
是椭圆
长轴的两个端点,
,则
______;
③若
是椭圆
长轴的两个端点,
,则
______.
(Ⅱ)观察①②③,由此可得到:若
是椭圆
长轴的两个端点,
为椭圆上任意一点,则
?并证明你的结论.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d059a0d71bddb677c603d84fac444b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c05f0c32208689b56d12e61d346fd9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9fc8163fb7025d0bce2f83ad8191666.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c05f0c32208689b56d12e61d346fd9.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6205da5e1d2730ee0b3de8bca3e29f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da717bc7190f12586864847836b4f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c05f0c32208689b56d12e61d346fd9.png)
(Ⅱ)观察①②③,由此可得到:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c05f0c32208689b56d12e61d346fd9.png)
19-20高二上·陕西西安·期中 查看更多[4]
陕西省西安市新城区西安中学2019-2020学年高二上学期期中数学(文)试题(已下线)【新教材精创】2.5.2+椭圆的几何性质(1)-B提高练-人教B版高中数学选择性必修第一册(已下线)【新教材精创】3.1.2+椭圆的简单几何性质(1)-B提高练-人教A版高中数学选择性必修第一册陕西省西安市长安区第一中学2020-2021学年高二上学期第二次月考数学(文)试题
更新时间:2019-11-19 09:06:24
|
【知识点】 椭圆中的定值问题
相似题推荐
【推荐1】在平面直角坐标系
中,椭圆
的中心为坐标原点,左焦点为
,
为椭圆
的上顶点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/0a233001-4e16-4dc3-b062-413b4fd0448b.png?resizew=228)
(1)求椭圆
的标准方程;
(2)已知直线
:
与椭圆
交于
、
两点,直线
与椭圆
交于
、
两点,且
,如图所示.
(ⅰ)证明:
;
(ⅱ)求四边形
的面积
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e9d55173f26afdf0e37462b556a605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8a7d5eb27476d3b132af446ec8b2b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/0a233001-4e16-4dc3-b062-413b4fd0448b.png?resizew=228)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a35b5d5cdc099c96660349ca2f5c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/3cccc3cd36e3d634663f8ae617426f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a9ee7944e39c3a8c7fc5d02fe4e73.png)
(ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c482ddecdf0e96951a02cdbf7042ae5.png)
(ⅱ)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,已知
分别为椭圆C:
的左、右焦点,P为椭圆C上一点,若
,
.
(1)求椭圆C的标准方程;
(2)若点P坐标为
,设不过点P的直线
与椭圆C交于A,B两点,A关于原点的对称点为
,记直线
,PB,
的斜率分别为k,
,
,若
,求证:直线
的斜率k为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347b68f42934c74e0d759a67613a1da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af13d098c047098b7ae8e0164efdaaf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70318640140823fc974fa205e3ad9a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/af621779-556d-405c-8699-b78964d33920.png?resizew=170)
(1)求椭圆C的标准方程;
(2)若点P坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4baa81ecbfe919134f955e4b4838f37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3f7368811340328acf5be13f499d38.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/2a760246566ed92cbc32180e03d51e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次