已知椭圆C:
(
)的左、右焦点分别为
,
,过
的直线l与椭圆C交于P,Q两点,与y轴交于点G.
(1)已知过原点且与l平行的直线
与椭圆C交于点A,B,求证:
;
(2)若椭圆C的离心率为
,且
,
,问
是否为定值?若是,求
的值;若不是,请说明理由.
![](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/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
(1)已知过原点且与l平行的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624bf696e787cad7ce0f61b0404d6ace.png)
(2)若椭圆C的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1996ba299a5a938593f8775404bdc35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d155673e6c19aca7c4b064d6a79557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19bc9c7083b1e9538337a3038712896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19bc9c7083b1e9538337a3038712896.png)
更新时间:2023-12-29 16:49:42
|
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适中
(0.65)
名校
解题方法
【推荐1】在平面直角坐标系
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,
,
为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08bc0e395049f7d7a680404b22140b1.png)
(1)求C的方程;
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedb55048f5efb1fcc467c95d8ab3073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35f3169e68f874bb31cb8a31caec87b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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【推荐2】焦点在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602baac86c2b1668ecdfadc8a5948885.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e8fd7b0f5e19e98eebbe844b2e5347.png)
(3)在(2)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知椭圆
的离心率为
,椭圆经过点
.
(1)求椭圆
的方程;
(2)过点
作直线
交
于
两点,试问:在
轴上是否存在一个定点
,使
为定值?若存在,求出这个定点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1fc56c646dd5485fcc3e59ddb5b56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01aa9452db45bbde802979b49fe4ff8b.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.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/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e057c31608d8a78166c09ddeb3a5a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知椭圆
:
的左,右焦点分别为
,离心率为
,
是
上的一个动点,且
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.
(1)求
的方程;
(2)设
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,若直线
分别交直线
于
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作以
为直径的圆的切线.证明:切线长为定值,并求该定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00df4f17848c072b51e80d427d486e31.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2e68abb370ec1b66d60640fd9f0dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be3d84692179e396bd44483c134f6c5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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