已知直线
与椭圆
相切于点
,直线
的斜率为
,设直线
与椭圆分别交于点
、
(异于点
),与直线
交于点
.
![](https://img.xkw.com/dksih/QBM/2021/6/20/2746975177302016/2747233757888512/STEM/c57e1f95-12d3-48a0-ac40-e8b32f8e8faf.png?resizew=274)
(1)求直线m的方程:
(2)证明:
成等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279cefeb5c389a37a71e5fd3925f5954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480f004c98a0df86a35a48bc973f0472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2021/6/20/2746975177302016/2747233757888512/STEM/c57e1f95-12d3-48a0-ac40-e8b32f8e8faf.png?resizew=274)
(1)求直线m的方程:
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71946190b0dcb5d62151c0b0d1b2a80.png)
2021·四川德阳·二模 查看更多[4]
四川省德阳市2021届高三二模数学(文)试题(已下线)考点43 直线与圆锥曲线的位置关系-备战2022年高考数学(理)一轮复习考点帮(已下线)考点41 直线与圆锥曲线的位置关系-备战2022年高考数学(文)一轮复习考点帮(已下线)解密14 圆锥曲线(分层训练)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(浙江专用)
更新时间:2021-06-20 20:04:17
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【推荐1】已知直线
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【推荐2】直线
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交于
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,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8a88a16125366536cb4ad658e0cf1.png)
,若
且椭圆的离心率
,又椭圆经过点
,
为坐标原点.
(Ⅰ)求椭圆的方程;
(Ⅱ)若直线
过椭圆的焦点
(
为半焦距),求直线
的斜率
的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb223b8777ab973970491bf0dcc6806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1df960feef63dec4790d63f52279.png)
![](https://img.xkw.com/dksih/QBM/2013/4/22/1571193186934784/1571193192800256/STEM/4c69034c59f5438ab315dc4eb94e12be.png?resizew=76)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8a88a16125366536cb4ad658e0cf1.png)
![](https://img.xkw.com/dksih/QBM/2013/4/22/1571193186934784/1571193192800256/STEM/0bc191ac6a09406b823113561dc56829.png?resizew=80)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cb5138a03b19266f82223899a614f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de85df85401e7e8da683ea4a784963c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8cd13928f5da237b624d6607129ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(Ⅰ)求椭圆的方程;
(Ⅱ)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7692a1221a8cd082d91815bf9c4cd7c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐1】已知椭圆
的长轴长是短轴长的2倍,且
经过点
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(1)求
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(2)若直线
与
交于
两点,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c6162828793e697cb1ad643b287c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705a67c4d1c23bf72bc9e4302ed6421a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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【推荐2】在平面直角坐标系
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(1) 若椭圆C的焦距为2,求a的值;
(2) 在(1)条件下,求直线
被椭圆C截得的线段长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31db5eed3e8d162a7255f2cc9d592865.png)
(1) 若椭圆C的焦距为2,求a的值;
(2) 在(1)条件下,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
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