在平面直角坐标系
中,已知椭圆
的离心率为
,且右焦点
到直线
的距离为
.
(2)设椭圆
上的任一点
,从原点
向圆
引两条切线,设两条切线的斜率分别为
,
(i)求证:
为定值;
(ii)当两条切线分别交椭圆于
时,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629bfcff97c1eb0873624fde373f3e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27567d43c5b91382ee3d7ca708ee422.png)
(2)设椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc56264b264eb7fcd697296ef415600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f767296276ab772cd8fb363916a37837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c445e365a6128937713669370d40c9.png)
(i)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
(ii)当两条切线分别交椭圆于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3da4a3cdea23c31f1b337571b9a4d9.png)
23-24高二上·安徽阜阳·期中 查看更多[4]
安徽省阜阳市第三中学2023-2024学年高二上学期二调考试(12月)数学试题(已下线)河南省信阳市信阳高级中学2023-2024学年高二上学期1月测试数学试题(已下线)专题03 圆锥曲线题型全归纳(九大考点)-【寒假自学课】2024年高二数学寒假提升学与练(人教A版2019)(已下线)微考点6-3 圆锥曲线中的定点定值问题(三大题型)
更新时间:2023-12-03 21:01:08
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【推荐1】已知椭圆
的长轴长为4,离心率为
,左顶点为
,过右焦点
作直线与椭圆分别交于
两点(异于左右顶点),连接
.
(1)证明:
与
不可能垂直;
(2)求
的最小值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491fa99ce27f7343c4f6392cb6c50394.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823aa3a403b140daf398912af4aeaff5.png)
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【推荐2】已知椭圆
(常数
)的离心率为
,
是椭圆
上的两个不同动点,
为坐标原点.
(1)求椭圆
的方程;
(2)已知
,满足
(
表示直线
的斜率),求
取值的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a5b087c270dfc3f5ac18ebbc07edf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b06046947fc7737b7159e968065d0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392d00243d81bf17ff3be81e7a7ee05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80065003fe6677e9a6b4f0dfb9d1db0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
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解答题-证明题
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【推荐1】已知椭圆
过点
,离心率为
.
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899774921129984/2909124976984064/STEM/12edb5da-9f0e-4a27-82d9-6bee0b2e1ae9.png?resizew=150)
(1)求椭圆的标准方程;
(2)过椭圆的上顶点作直线l交抛物线
于A,B两点,O为坐标原点.
①求证:
;
②设OA,OB分别与椭圆相交于C,D两点,过点O作直线CD的垂线OH,垂足为H,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4ca616e225686a236f7c2db3e16dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb7c44fbd558182e05b1f82e4c337c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899774921129984/2909124976984064/STEM/12edb5da-9f0e-4a27-82d9-6bee0b2e1ae9.png?resizew=150)
(1)求椭圆的标准方程;
(2)过椭圆的上顶点作直线l交抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f4123c19136d3a4dc040dce8e34e14.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
②设OA,OB分别与椭圆相交于C,D两点,过点O作直线CD的垂线OH,垂足为H,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33a489fa920ff269b00784034def90a.png)
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【推荐2】已知点F1为椭圆
1(a>b>0)的左焦点,
在椭圆上,PF1⊥x轴.
(1)求椭圆的方程;
(2)已知直线l:y=kx+m与椭圆交于(1,2),B两点,O为坐标原点,且OA⊥OB,O到直线l的距离是否为定值?若是,求出该定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22ecb9b0a87ab5098571bdf80441231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f637d3b25fcafcd463ac18d15e2e65f.png)
(1)求椭圆的方程;
(2)已知直线l:y=kx+m与椭圆交于(1,2),B两点,O为坐标原点,且OA⊥OB,O到直线l的距离是否为定值?若是,求出该定值;若不是,请说明理由.
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