已知M,N两点的坐标分别为
,直线MQ,NQ相交于点Q,且它们的斜率之积为
.
(1)求点Q的轨迹方程;
(2)设过点
的直线l与点Q的轨迹交于D,E两点,问在x轴上是否存在定点P,使得
为常数?若存在,求出点P的坐标以及该常数的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0586ffe4bc516265086c6b5eafd1eed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求点Q的轨迹方程;
(2)设过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae88a1970c0af500b31bf366e30fff98.png)
更新时间:2023-02-16 08:50:15
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名校
解题方法
【推荐1】在平面直角坐标系
中,已知
,
,且
,记动点
的轨迹为
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(1)求曲线
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,使得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139b246d9e92f142d0e7277f9eaecf83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139b246d9e92f142d0e7277f9eaecf83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解题方法
【推荐2】已知点
,
,动点
满足
与
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,记
的轨迹为
.
(1)求
的方程;
(2)设过坐标原点的直线
与
交于
,
两点,且四边形
的面积为
,求
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3de32e9600fe1f96dde546a4be74cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c72762328d6e65c9c06f8a3d6fa1abf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602baac86c2b1668ecdfadc8a5948885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设过坐标原点的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】已知椭圆C:
(
).若
,
,
,
四点中有且仅有三点在椭面C上.
(1)求椭圆C的标准方程;
(2)设O为坐标原点,F为椭圆C的右焦点,过点F的直线l分别与椭圆C交于M,N两点,
,求证:直线
,
关于x轴对称.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41ac040e63589b9d5dca3ab377c39cf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5835a53dcfd508f15f71b9aafd5f74ce.png)
(1)求椭圆C的标准方程;
(2)设O为坐标原点,F为椭圆C的右焦点,过点F的直线l分别与椭圆C交于M,N两点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb203d8908ffd00fc19e6d8b5f3eae4.png)
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【推荐2】已知抛物线
的焦点F与椭圆C:
的一个焦点重合,且点F关于直线
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求椭圆C的标准方程;
过点
且斜率为k的动直线l交椭圆于A、B两点,在y轴上是否存在定点M,使以AB为直径的圆恒过这个点?若存在,求出M点的坐标,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661bd8d4d82205bd311e7349ae91f602.png)
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