如图,在平面直角坐标系
中,已知点
是抛物线
上的一个点,其横坐标为
,过点
作抛物线
的切线
.
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720043547090944/2722362301571072/STEM/b5cafd7e95184d7c8b07e5d89a15dded.png?resizew=184)
(1)求直线
的斜率(用
与
表示);
(2)若椭圆
过点
,
与
的另一个交点为
,
与
的另一个交点为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ef277070a44f0f980f2d473b097700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720043547090944/2722362301571072/STEM/b5cafd7e95184d7c8b07e5d89a15dded.png?resizew=184)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65523ec0f7b27eb5a5bc135766c4b9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9e5f1cfea3643c30c21732073a11ef.png)
更新时间:2021-05-16 16:43:11
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【推荐1】已知点A,B的坐标分别为(-2,0),(2,0).三角形ABM的两条边AM,BM所在直线的斜率之积是-
.
(Ⅰ)求点M的轨迹方程;
(Ⅱ)设直线AM方程为
,直线l方程为x=2,直线AM交l于P,点P,Q关于x轴对称,直线MQ与x轴相交于点D.若△APD面积为2
,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(Ⅰ)求点M的轨迹方程;
(Ⅱ)设直线AM方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4f1a498f43f569dfcbe400eb7e00d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
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【推荐2】如图,焦点在
轴上的椭圆
,焦距为
,椭圆的顶点坐标为
,
.
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219840667648000/2219876929937408/STEM/2260788179344e549b0836e652a11b91.png?resizew=230)
(1)求椭圆
的方程;
(2)点
为
轴上一点,过
作
轴的垂线交椭圆
于不同的两点
,
,过
作
的垂线交
于点
,求
与
的面积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee80939187a84e1863eeb192a301c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219840667648000/2219876929937408/STEM/2260788179344e549b0836e652a11b91.png?resizew=230)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222d3ec99bc21b586b083bd9d67b225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e787130d60729f8dd0ade367e9f23c4.png)
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解题方法
【推荐1】已知抛物线
上一点
到其焦点的距离为10.
(Ⅰ)求抛物线C的方程;
(Ⅱ)设过焦点F的直线l与抛物线C交于A,B两点,且抛物线在A,B两点处的切线分别交x轴于P,Q两点,
①设
,求点P的横坐标;
②求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b7b597a02e45d473be799509933a86.png)
(Ⅰ)求抛物线C的方程;
(Ⅱ)设过焦点F的直线l与抛物线C交于A,B两点,且抛物线在A,B两点处的切线分别交x轴于P,Q两点,
①设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082dfa67d1a70508e211be2cc553ea76.png)
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解答题-证明题
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【推荐2】已知圆
,圆心
在抛物线
上,圆
过原点且与
的准线相切.
(1)求抛物线
的方程;
(2)设点
,点
(与
不重合)在直线
上运动,过点
作
的两条切线,切点分别为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577d72e323dd4403144f83bd3e318418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97ee4f9915b7f6095bb7673f92ea989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffece72bbdeda49baee1a1b9c8b66af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/b99bdd50e548c807255d2f9b8cd16860.png)
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