如图,过椭圆
上的定点
作倾斜角互补的两直线,设其分别交椭圆
于
两点,求证:直线
的斜率是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbec8b46231e412ddce55cc96634e182.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
2024高三·全国·专题练习 查看更多[1]
(已下线)大招26 齐次化法
更新时间:2024-04-10 11:43:22
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【知识点】 椭圆中的定值问题
相似题推荐
【推荐1】(本小题满分12分)
已知椭圆
,直线
不过原点O且不平行于坐标轴,
与
有两
个交点A、B,线段AB的中点为M.
(1)若
,点K在椭圆
上,
、
分别为椭圆的两个焦点,求
的范围;
(2)证明:直线
的斜率与
的斜率的乘积为定值;
(3)若
过点
,射线OM与
交于点P,四边形
能否为平行四边形?
若能,求此时
的斜率;若不能,说明理由.
已知椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6651a5a8fe78e43918d245b97c4811fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250463fe0a241ded5e28ac2c0e7ca699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
个交点A、B,线段AB的中点为M.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1553006815bd3d2ff0509a60f8e1f11f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09a8ac969e5cec3be6abf4ff44c692e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6758b8b074d33ea9e82818593656e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77dbec0658401da14c304a331354236.png)
(2)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3c45d2ad3093a3877a8e0e5ee7bd3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4b37603d3b3530824c24907c708d8c.png)
若能,求此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解答题-问答题
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解题方法
【推荐2】在直角坐标系中,椭圆
的焦点分别为
,经过
且垂直于x轴的直线交椭圆于A,B两点,
.
(1)求椭圆M的方程;
(2)已知点
是椭圆M上位于x轴上方的定点,E,F是椭圆M上的两个动点,直线
与直线
分别于x轴相交于G、H两点,且
,求直线
的斜率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c6162828793e697cb1ad643b287c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f49644cd9fa4688cc3a74a234952530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f23420529a6a808d22d454e87a6194.png)
(1)求椭圆M的方程;
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30ee8b98bd071f65863897db9cbacb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2079b7e06f51e53136f55642fd7acf37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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