已知抛物线
的焦点为
,
为坐标原点,过点
的直线
与
交于
、
两点.
(1)若直线
与圆
相切,求直线
的方程;
(2)若直线
与
轴的交点为
,且
,
,试探究:
是否为定值.若为定值,求出该定值,若不为定值,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ffce41d1a299a180aaccab99f6598a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29be398995d0bc513111cf8eecca7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa278c5fd7fb4dd9ecb6b60cfaf7abc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
更新时间:2020-06-24 22:20:49
|
相似题推荐
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】已知点P为椭圆
上一动点,
,
为左右两焦点,点P到坐标原点的最大距离为
,
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![](https://img.xkw.com/dksih/QBM/2022/4/22/2963608780251136/2965210494631936/STEM/1400f574-9cba-4992-8252-0ea54bca990f.png?resizew=288)
(1)求椭圆C的方程;
(2)过动点P(不在坐标轴上)作圆
的两条切线,切点分别为A,B,直线AB交椭圆于M,N两点,求
的面积S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.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/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963608780251136/2965210494631936/STEM/1400f574-9cba-4992-8252-0ea54bca990f.png?resizew=288)
(1)求椭圆C的方程;
(2)过动点P(不在坐标轴上)作圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74c4299221a967507c6a179337581a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
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解题方法
【推荐2】已知圆
.
(1)从圆外一点
向圆引切线,求切线方程;
(2)若圆
与圆C相交于
两点,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e6a95d85a6bfc628a8e63dd71ffcd7.png)
(1)从圆外一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4754fbe523ca63eba3810a3f88f37df3.png)
(2)若圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3ef6da64080039ca5541c7d6b23d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-问答题
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解题方法
【推荐1】如图已知抛物线
的焦点坐标为
,过
的直线交抛物线
于
两点,直线
分别与直线
相交于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/17/42bfcbfe-806a-48d5-b174-87b2ba05c3dd.png?resizew=251)
(1)求抛物线
的方程;
(2)证明
与
的面积之比为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df40ba57bb5819b4aaa38d514500052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092fd1b1d33979818300cd2e3699bff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739ac456da45baf5f103ba376ae88058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23a17a4f6af9cdd1455190ce90492b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/17/42bfcbfe-806a-48d5-b174-87b2ba05c3dd.png?resizew=251)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066ea7c8dac31105aadedad5f34d93fa.png)
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【推荐2】如图,
是抛物线
的焦点,
是准线与x轴的交点,直线
经过点Q.
(Ⅰ)直线
与抛物线有唯一公共点,求
的方程;
(Ⅱ)直线
与抛物线交于A、B两点;
(i)设
、
的斜率分别为
,求
的值;
(ii)若点R在线段AB上,且满足
,求点R的轨迹方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(Ⅰ)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(Ⅱ)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(i)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90963760acac7bfad3ae03088c6c80b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
(ii)若点R在线段AB上,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d99806fb8cfe2b38d589255b4758ae3.png)
![](https://img.xkw.com/dksih/QBM/2011/12/19/1570623201951744/1570623207522304/STEM/bdda8c740b25427d9e922b46ca45f6e6.png?resizew=178)
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