已知圆
上的动点P在y轴上的投影为Q,动点M满足
.
(1)求动点M的轨迹方程C;
(2)动直线
与曲线C交于A,B两点,问:是否存在定点D,使得
为定值,若存在,请求出点D的坐标及该定值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0128793bbbaabe8301b23e4c96ac8583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e917a9e02e316d6e9e591ccfa2af6f28.png)
(1)求动点M的轨迹方程C;
(2)动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a8d6991873e79b298984a95b8954b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f96e26a79d12063cdc069e72034df94.png)
更新时间:2023-01-06 14:25:09
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【推荐1】已知动点Q到点
的距离与到直线
的距离之比为
,Q点的轨迹为曲线C.
(1)求曲线C的方程;
(2)已知
,
,A,B为曲线C上异于M,N的两点,直线
,
相交于点T,点T在直线
上,问直线
是否过定点?若过定点,请求出定点坐标:若不过定点,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5370293831686e2488b2bef6b68572fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58aee863f18d4119ec9c421d8050fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe2c533dbc23a34518f72f3cb14f330.png)
(1)求曲线C的方程;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843e3f8c3314d51a322c6122a13745c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c477662c046daefe58026249658b6d4.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/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】已知点
是抛物线
的顶点,
,
是
上的两个动点,且
.
(1)判断点
是否在直线
上?说明理由;
(2)设点
是△
的外接圆的圆心,求点
的轨迹方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572ad5e2c76857cedb71554447b623bb.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa1a88502c7aa081fde174fcb6d6cdd.png)
(1)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7968194cf13e872ab941231cfc9eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】已知曲线
的左、右焦点分别为
,直线
经过
且与
相交于
两点.
的周长;
(2)若以
为圆心的圆截
轴所得的弦长为
,且
与圆
相切,求
的方程;
(3)设
的斜率为
,在
轴上是否存在一点
,使得
且
?若存在,求出
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b7f8b756d52496f65d22655c019b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7638c88f01d609d79947033ed4ff36a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ebaa32f4f1f4f807ca9aeb7fb29951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e136b1fb5fa8e804a8d69bb094e6a1.png)
(2)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60097cec26b613837579cff70a863a42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421efaa705bbca9b2ec24f6b8c1a0ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】已知点
,点
分别为椭圆
的左、右顶点,直线
交
于点
是等腰直角三角形,且
.
(1)过椭圆
的上顶点
引两条互相垂直的直线
,记
上任一点
到两直线
的距离分别为
,求
的最大值;
(2)过点
且斜率不为零的直线与椭圆
相交于
两点试问:是否存在
轴上的定点
,使得
.若存在,求出定点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec3fdb2722c0bcac5303546e87152a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915b001438c9868298c66c7c2db35426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70f9ada378253f050596a211b55ae5d.png)
(1)过椭圆
![](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/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2f1c1409a06278e847e6b573cef254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5deabcc24bf89bc45425067086b0d9.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d196d17bd2569f9e99a945809d08599b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a1f01eda6a5ae35b58e4f68c99ce02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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【推荐1】已知点
为抛物线
上一点,F为抛物线C的焦点,抛物线C在点P处的切线与y轴相交于点Q,且
面积为2.
(1)求抛物线C的方程;
(2)设直线l经过
交抛物线C于M,N两点(异于点P),求证:
的大小为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d923eeca15176eed820f241a322eca3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a9bf6bda9363dbef5f6ff4bf6a5edf.png)
(1)求抛物线C的方程;
(2)设直线l经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48a644e1135f4ddcd2fe1a345769812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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【推荐2】已知点F是抛物线C:
的焦点,S是抛物线C在第一象限内的点,且|SF|=
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/c3030100-9157-4f55-bb2e-da6fcfaf6de6.png?resizew=213)
(Ⅰ)求点S的坐标;
(Ⅱ)以S为圆心的动圆与
轴分别交于两点A、B,延长SA、SB分别交抛物线C于M、N两点;
①判断直线MN的斜率是否为定值,并说明理由;
②延长NM交
轴于点E,若|EM|=
|NE|,求cos∠MSN的值.
![](https://img.xkw.com/dksih/QBM/2013/3/12/1571137333796864/1571137339572224/STEM/b962f559591044e090d39bfe69fc8734.png)
![](https://img.xkw.com/dksih/QBM/2013/3/12/1571137333796864/1571137339572224/STEM/cacbe65500e2431f93a5510a75d1103c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/c3030100-9157-4f55-bb2e-da6fcfaf6de6.png?resizew=213)
(Ⅰ)求点S的坐标;
(Ⅱ)以S为圆心的动圆与
![](https://img.xkw.com/dksih/QBM/2013/3/12/1571137333796864/1571137339572224/STEM/b71cfd1903034a6db9d6063ee3201c8f.png)
①判断直线MN的斜率是否为定值,并说明理由;
②延长NM交
![](https://img.xkw.com/dksih/QBM/2013/3/12/1571137333796864/1571137339572224/STEM/b71cfd1903034a6db9d6063ee3201c8f.png)
![](https://img.xkw.com/dksih/QBM/2013/3/12/1571137333796864/1571137339572224/STEM/66c8b80a22154e77971fecea20805c34.png)
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