在平面直角坐标系
中,已知
,动点
满足
.
(1)求动点
的轨迹
的方程;
(2)若点M为(1)中轨迹
上一动点,
,直线MA与
的另一个交点为N;记
,若t值与点M位置无关,则称此时的点A为“稳定点”.是否存在 “稳定点”?若存在,求出该点;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d153335bfcf21a102cb0cf8db46b9358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d134c328f31f3e96c3b52931caeb2b27.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)若点M为(1)中轨迹
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278cf6a6d56e8fbb3219af411beede7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a05397ef687cdd89fd4296785a39c8cd.png)
更新时间:2020-07-02 11:38:36
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】求解下列问题:
(1)如图,动圆
:
,
与椭圆
:
相交于A,B,C,D四点,点
,
分别为
的左、右顶点.求直线
与直线
的交点M的轨迹方程.
(2)已知
,
分别为椭圆C:
的左、右焦点,点P为椭圆C上的动点,求
的重心G的轨迹方程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/19/f6a17f3e-4b56-4960-be01-63315dd54286.png?resizew=210)
(1)如图,动圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7de36c61b46411ca108be04d35267a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b0e17dfc63c448783e1a8c3aed9267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf679418512d6ad973531df808fd267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668438e15423368cd744445e824d18a1.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在平面直角坐标系中,已知△PAB的周长为8,且点A,B的坐标分别为(-1,0),(1,0).
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967885671440384/1969089917812736/STEM/4ee20fcfc659465bb2d9bbbc2f015889.png?resizew=132)
(1)试求顶点P的轨迹C1的方程.
(2)若动点P1(x1,y1)在曲线C1上,试求动点Q(
,
)的轨迹C2的方程.
(3)过点C(3,0)作直线l与(2)中的曲线C2相交于M,N两点,试探究是否存在直线l,使得点N恰好是线段CM的中点.若存在,求出直线l的方程;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967885671440384/1969089917812736/STEM/4ee20fcfc659465bb2d9bbbc2f015889.png?resizew=132)
(1)试求顶点P的轨迹C1的方程.
(2)若动点P1(x1,y1)在曲线C1上,试求动点Q(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0801989ffb62d2ace24666fbfc08d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f3d0fc08b44e58f962c7ea0c7d824f.png)
(3)过点C(3,0)作直线l与(2)中的曲线C2相交于M,N两点,试探究是否存在直线l,使得点N恰好是线段CM的中点.若存在,求出直线l的方程;若不存在,请说明理由.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
真题
解题方法
【推荐1】在直角坐标系xOy中,曲线C1的点均在C2:(x-5)2+y2=9外,且对C1上任意一点M,M到直线x=﹣2的距离等于该点与圆C2上点的距离的最小值.
(1)求曲线C1的方程;
(2)设P(x0,y0)(y0≠±3)为圆C2外一点,过P作圆C2的两条切线,分别与曲线C1相交于点A,B和C,D.证明:当P在直线x=﹣4上运动时,四点A,B,C,D的纵坐标之积为定值.
(1)求曲线C1的方程;
(2)设P(x0,y0)(y0≠±3)为圆C2外一点,过P作圆C2的两条切线,分别与曲线C1相交于点A,B和C,D.证明:当P在直线x=﹣4上运动时,四点A,B,C,D的纵坐标之积为定值.
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2】已知抛物线
的顶点在原点,焦点
在
轴正半轴上,抛物线上一点
到其准线的距离为5,过点
的直线
依次与抛物线
及圆
交于
、
、
、
四点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/09bc32ea-5ba8-428b-b19c-cedeb983ca7f.png?resizew=182)
(1)求抛物线
的方程;
(2)探究
是否为定值,若是,求出该定值;若不是,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c0980761f2c189bb51b9c12a79d77d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e318cefab1d71238b6a770e9d5fe154e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/09bc32ea-5ba8-428b-b19c-cedeb983ca7f.png?resizew=182)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba9fc9ae9bc7000a7f3daba16091a02.png)
您最近一年使用:0次
【推荐1】已知抛物线
的焦点为F,点P在抛物线上,O为坐标原点,且
.
(1)抛物线E的标准方程;
(2)如图所示,过点
和点
分别作两条斜率为k的平行弦分别和抛物线E相交于点A,B和点C,D,得到一个梯形ABCD.记梯形两腰AD和BC的斜率分别为
和
,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981554522841088/2982714736459776/STEM/902a180e-205e-4fce-835e-790f201c0a3d.png?resizew=142)
(i)试求实数k的值;
(ii)若存在实数
,使得
,试求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b527ec9f92467b8f24554a2a67ee987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c8392d5bdd018d13d60a803899fb74.png)
(1)抛物线E的标准方程;
(2)如图所示,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115f63c0df02147bb911a1c267576777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee9b0cb76c47163d199a31bfa747cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9972e1d4dfa4e311985876edccd70f3.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981554522841088/2982714736459776/STEM/902a180e-205e-4fce-835e-790f201c0a3d.png?resizew=142)
(i)试求实数k的值;
(ii)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a532bd96f597e97531893ba3432b82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】在平面直角坐标系
中,已知抛物线
的焦点为
,过
作斜率为
的直线
交抛物线于
(异于
点),已知
,直线
交抛物线于另一点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/ac538870-9840-4d90-b514-a89074e8a58e.png?resizew=146)
(1)求抛物线
的方程;
(2)
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97afdeaa1d4433cffe5005446fcbbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775f2a1378379ab224de7971178730d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/ac538870-9840-4d90-b514-a89074e8a58e.png?resizew=146)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f810a0f04cb468d4d63ecf9c3d7600e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次