2018高三·江苏·专题练习
1 . 设动点
到定点
的距离比它到
轴的距离大
,记点
的轨迹为曲线
.
(1)求点
的轨迹方程;
(2)若圆心在曲线
上的动圆
过点
,试证明圆
与
轴必相交,且截
轴所得的弦长为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7df8e1a5a4e176bb2ebb8a7443b8ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若圆心在曲线
![](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/32366143230ca122894a4bada7c7b96d.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/81dea63b8ce3e51adf66cf7b9982a248.png)
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11-12高二上·浙江金华·阶段练习
2 . 已知平面上的动点Q到定点F(0,1)的距离与它到定直线y=3的距离相等.
(1)求动点Q的轨迹C1的方程;
(2)过点F作直线l1交C2:x2=4y于A,B两点(B在第一象限).若|BF|=2|AF|,求直线l1的方程.
(3)试问在曲线C1上是否存在一点M,过点M作曲线C1的切线l2交抛物线C2于D,E两点,使得DF⊥EF?若存在,求出点M的坐标;若不存在,请说明理由.
(1)求动点Q的轨迹C1的方程;
(2)过点F作直线l1交C2:x2=4y于A,B两点(B在第一象限).若|BF|=2|AF|,求直线l1的方程.
(3)试问在曲线C1上是否存在一点M,过点M作曲线C1的切线l2交抛物线C2于D,E两点,使得DF⊥EF?若存在,求出点M的坐标;若不存在,请说明理由.
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2011·黑龙江·二模
3 . 已知抛物线
的焦点为
,点
为抛物线上的动点,点
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/088fcdd595455906a1a7080d630611f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd82b6adaf001abb2328f10b6a7a914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0115869de235cdafcbe7ec405ceb3f62.png)
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4 . 已知平面内一动点Q到点F(4,0)的距离与点Q到直线
的距离的差等于1.
(1)求动点Q的轨迹C的方程;
(2)设点B(2,5),P(1,3),点Q为轨迹C的一个动点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba53065eb180a682305fddb95d14b62f.png)
(1)求动点Q的轨迹C的方程;
(2)设点B(2,5),P(1,3),点Q为轨迹C的一个动点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd431ee5d9d822d33b989d6cf9b1173.png)
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10-11高二下·广东梅州·期末
5 . 已知动圆经过点(1,0),且与直线
相切,
(1)求动圆圆心的轨迹方程
(2)在(1)中的曲线上求一点,使这点到直线
的距离最短
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
(1)求动圆圆心的轨迹方程
(2)在(1)中的曲线上求一点,使这点到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a43957245eb8c4d6f2d311f6d11a2ed.png)
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2011·宁夏吴忠·一模
6 . 已知曲线C上任意一点M到点F(0,1)的距离比它到直线
:y=﹣2的距离小1.
(1)求曲线C的方程;
(2)过点P(2,2)的直线与曲线C交于A、B两点,设
.当△AOB的面积为
时(O为坐标原点),求λ的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(1)求曲线C的方程;
(2)过点P(2,2)的直线与曲线C交于A、B两点,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9935e51368d809d4af5f45da02a6b206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
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名校
7 . 已知抛物线
的焦点为
,以
为圆心,
长为半径画圆,在
轴上方交抛物线于
、
不同的两点.
(Ⅰ)求
的取值范围;
(Ⅱ)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43699b6ac27f4ee4f186c76c1a8ae16a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4320a6611e9bd97dd024be55124b43f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaff41080fdea43eea7efedf9ebc1498.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef0c8db5a46dcd57765642efdd59ce2.png)
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12-13高二上·福建·期末
8 . 已知抛物线
的焦点为
,点
为抛物线上的动点,点
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/088fcdd595455906a1a7080d630611f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b946204caf1623dbd51348b2ffb0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0115869de235cdafcbe7ec405ceb3f62.png)
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名校
9 . 已知抛物线
的焦点为
,准线为
,圆
被直线
截得的线段长为
.
(1)求抛物线
和圆
的方程;
(2)设直线
与
轴的交点为
,过点
的直线
与抛物线
交于
两点,求证:直线
的斜率与直线
的斜率的和为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f80080fac68745fe783b879cccb6140.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/7c8ce60e1a76cf034fc0b4c6e15b4e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)设直线
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
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