已知动圆过定点P(4,0),且在y轴上截得的弦MN的长为8.
(1)求动圆圆心C的轨迹方程;
(2)过点(2,0)的直线l与动圆圆心C的轨迹交于A,B两点,求证:
是一个定值.
(1)求动圆圆心C的轨迹方程;
(2)过点(2,0)的直线l与动圆圆心C的轨迹交于A,B两点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658aa70a197c830aa765f2f7ea4c86c5.png)
更新时间:2018-10-02 22:00:46
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相似题推荐
【推荐1】已知点P为直线
上任意一点,
,M为平面内一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/a8848019-553e-4156-ab35-251261e39e6e.png?resizew=197)
(Ⅰ)求点M的轨迹E的方程;
(Ⅱ)过点P作曲线E的切线,切点分别是
.若
,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b556b1a9944719cf423e90f8df16c773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/a8848019-553e-4156-ab35-251261e39e6e.png?resizew=197)
(Ⅰ)求点M的轨迹E的方程;
(Ⅱ)过点P作曲线E的切线,切点分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b293f4c5916f3f6c9fa3c174ba442082.png)
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【推荐2】已知方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73e41be08cb1a0247f56b020905b922.png)
(1)试证:不论
如何变化,方程都表示顶点在同一椭圆上的抛物线
(2)
为何值时,该抛物线在直线
上截得的弦最长?并求出此弦长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73e41be08cb1a0247f56b020905b922.png)
(1)试证:不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914b8992c23d0835e27dced0db075ad0.png)
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【推荐1】设抛物线C:
的焦点为F,经过点F的动直线
交抛物线C于
两点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b3e354f5162023fc1c4838b263e3fe.png)
(1)求抛物线C的方程;
(2)若点M是抛物线C的准线上的一点,直线MF、MA、MB的斜率分别为
求证:当
时,
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994c0cb1e435532f108c00d28f2437a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926101582b7fd6705b0deecc69be8d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b3e354f5162023fc1c4838b263e3fe.png)
(1)求抛物线C的方程;
(2)若点M是抛物线C的准线上的一点,直线MF、MA、MB的斜率分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bbe2cf85585c0b7a56a87c03f9d7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1aa449dde6c821a649451b09100a539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
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【推荐2】已知抛物线的方程为
,过点
的一条直线与抛物线
交于
两点,若抛物线在
两点的切线交于点
.
(1)求点
的轨迹方程;
(2)设直线
的斜率存在,取为
,取直线
的斜率为
,请验证
是否为定值?若是,计算出该值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75ebcf0d951f833ca90e040f3cd4db6.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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6652d2342b9e97385ef10fcb71db3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1dc007e36c78ab98df4cd2383b4c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29193a6ab894211a4d0371ba40e98ff6.png)
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