如图,已知圆
,设A为圆C与x轴负半轴的交点,过点A作圆C的弦AM,并使弦AM的中点恰好落在y轴上.
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607655936/STEM/227f82d3d93f48e39efa898d94a75d5d.png?resizew=158)
(1)当r在
内变化时,求点M的轨迹E的方程;
(2)已知定点
和
,设直线PM、QM与轨迹E的另一个交点分别是
.求证:当M点在轨迹E上变动时,只要
都存在且
,则直线
恒过一个定点,并求出这个定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e28d333929a88ed1135f8785d017b8.png)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572500601774080/1572500607655936/STEM/227f82d3d93f48e39efa898d94a75d5d.png?resizew=158)
(1)当r在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e1c9c97de9198d47306216e9961b80.png)
(2)已知定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada785fae54b7aa18e8f60cad8d887be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1777a71d3ba5d11534de2e2319c14d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c07fb3f5689102322a77f848370445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c07fb3f5689102322a77f848370445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d13c7dfe85ea3ef8c7cd06224651a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dedd84baa5219a2af415be51947c301.png)
更新时间:2016-12-04 02:43:35
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知圆
.
(1)过点
作圆C的切线l,求切线l的方程;
(2)设过点
的直线m与圆C交于AB两点,若点A、B分圆周得两段弧长之比为1:2,求直线m得方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83727e2145603395792d9a7eac4d1f38.png)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1e2cd827c3399f169424c570acfc5.png)
(2)设过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f935fa5d0ae1b208aff21aa468ecf8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】选修4-1:几何证明选讲.
如图,AB是圆O的一条弦,过点A作圆的切线AC,作BC⊥AC,与该圆交于点D,若AC=2
,CD=2.
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572975037546496/1572975043747840/STEM/f388b73b645149c882171d7eb98a94ec.png)
(1)求圆O的半径;
(2)若点E为AB中点,求证:O,E,D三点共线.
如图,AB是圆O的一条弦,过点A作圆的切线AC,作BC⊥AC,与该圆交于点D,若AC=2
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572975037546496/1572975043747840/STEM/344f4f4373f04addbd9f3fd844dd6491.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572975037546496/1572975043747840/STEM/f388b73b645149c882171d7eb98a94ec.png)
(1)求圆O的半径;
(2)若点E为AB中点,求证:O,E,D三点共线.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知点
是圆
上任意一点,过点
作
轴的垂线,垂足为
,点
满足:
.
(1)求点
的轨迹方程;
(2)写出满足点
的轨迹的两个性质.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ab11ba6b230c4309e1b899eb58daae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3697b69af9284041971286f28c8b984.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)写出满足点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】在平面直角坐标系xOy中,动点M的坐标
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d834ce5f0eca1842b50ccf0e78e7bc.png)
(1)求动点M的轨迹E的方程;
(2)若双曲线
的左焦点为F,直线l:
与轨迹E交于不同的两点A,B,且点A关于x轴的对称点在直线FB上,求证:直线l经过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d834ce5f0eca1842b50ccf0e78e7bc.png)
(1)求动点M的轨迹E的方程;
(2)若双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea74737939c0f94c91229a7098f36ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】在平面直角坐标系
中,曲线
的参数方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac9b5af135ada982f4b3013c6f8d1b0.png)
为
上的动点,点
满足
,设点
的轨迹为曲线
,以
为极点,
轴正半轴为极轴建立极坐标系.
(1)写出曲线
的极坐标方程;
(2)直线
(
,
),与曲线
交于点
(不同于原点),与曲线
:
交于点
(不同于原点),求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac9b5af135ada982f4b3013c6f8d1b0.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096d76252cd0a243d990354e679a4510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)写出曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f5d2e8186f0173d7862b1d39fb3dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fece79e7cf22f4a2b0a27c4347e2546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c516619a5b3c6676e6734efa754e5d.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9281fe131dbc46c78527a4779ee9700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知抛物线
上一点
到其焦点的距离为5.
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899466200055808/2903016204541952/STEM/56a65b2f05d64e879ce862b54d7a75de.png?resizew=346)
(1)求
与
的值;
(2)过点
作斜率存在的直线
与拋物线交于
两点(异于原点
),
为
在
轴上的投影,连接
与
分别交抛物线于
,问:直线
是否过定点,若存在,求出该定点,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715ddd908bb767484dfc2b7458b8ce64.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899466200055808/2903016204541952/STEM/56a65b2f05d64e879ce862b54d7a75de.png?resizew=346)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa118c0fb33ab21dfc494cb868fa983d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】在直角坐标系
中,已知定点
,定直线
,动点
到直线
的距离比动点
到点
的距离大
.记动点
的轨迹为曲线
.
(1)求
的方程,并说明
是什么曲线?
(2)设
在
上,不过点
的动直线
与
交于
,
两点,若
,证明:直线
恒过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9a6aafcd3a93f5619c904ad12c02f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7251452d9c6c09b409f734cc48f4d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
您最近一年使用:0次