1 . 在△ABC中,B(-4,0),C(4,0),且周长为18.
(1)求证:点A在一个椭圆上运动;
(2)写出这个椭圆的标准方程.
(1)求证:点A在一个椭圆上运动;
(2)写出这个椭圆的标准方程.
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2 . 已知圆
.
(1)设点
是圆
上一点,求
的取值范围;
(2)如图,定点
,
为圆
上一动点,
的中垂线交
于点
.求证:动点
的轨迹为椭圆,并求其方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d723ec3118dcc3be5c552b3d4bda4ff5.png)
(1)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defd208a1573c26c88e0ed21c5f89ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(2)如图,定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/110594e5-236e-43e4-831a-cd5ae8de2a89.png?resizew=152)
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3 . 已知△ABC中,B(-1,0),C(1,0),AB=6,点P在AB上,且∠BAC=∠PCA.
(1)求点P的轨迹E的方程;
(2)若
,过点C的直线与E交于M,N两点,与直线x=9交于点K,记QM,QN,QK的斜率分别为k1,k2,k3,试探究k1,k2,k3的关系,并证明.
(1)求点P的轨迹E的方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a6ee8e86152340190722367782b84a.png)
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4 . 已知
为椭圆
的右焦点,点
在
上,且
轴.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/511d3ab1-abe7-45ee-9de7-56af51dd98df.png?resizew=171)
(1)求
的方程
(2)过
的直线
交
于
两点,交直线
于点
.证明:直线
的斜率成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5f4493abd2b69f83eae0362c509f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b1da9046b4cb82135a4a1eaa528c53.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/511d3ab1-abe7-45ee-9de7-56af51dd98df.png?resizew=171)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77f8d0c1396be699ccacac8bcc56724.png)
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