过直线
上一动点
不在
轴上)作焦点为
的抛物线
的两条切线,
为切点,直线
分别与
轴交于点
.
(1)求证:
,并求
的外接圆面积的最小值;
(2)求证:直线
恒过一定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577319b0be3ce2afbd0235dfb0421c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8661038810b680d04d65fe208b0ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63309dbc3612815f6dbdee23d9a10adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d42cb68c5c877a455ba7ac0a6b6a651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8169b4bd7334949571b8134d8d4ff8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/efe5dea5-0921-48aa-8cf1-1249910625cf.png?resizew=280)
2017·陕西西安·一模 查看更多[2]
更新时间:2017-07-23 21:43:09
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相似题推荐
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【推荐1】已知抛物线C:
经过点
.
求抛物线C的方程;
若A,B为抛物线C上不同的两点,且AB的中点坐标为
,求直线AB的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642bade9e30b7a60c2b3b7d48d87d4f9.png)
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【推荐2】如图,过抛物线M:y=x2上一点A(点A不与原点O重合)作抛物线M的切线AB交y轴于点B,点C是抛物线M上异于点A的点,设G为△ABC的重心(三条中线的交点),直线CG交y轴于点D.
![](https://img.xkw.com/dksih/QBM/2018/4/23/1930385238294528/1932981909823488/STEM/bf6e61c93cd545638e06d35c7b092ae9.png?resizew=211)
(Ⅰ)设A(x0,x02)(x0≠0),求直线AB的方程;
(Ⅱ)求
的值.
![](https://img.xkw.com/dksih/QBM/2018/4/23/1930385238294528/1932981909823488/STEM/bf6e61c93cd545638e06d35c7b092ae9.png?resizew=211)
(Ⅰ)设A(x0,x02)(x0≠0),求直线AB的方程;
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de1fc85f1712c7ed787976a723944b4.png)
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解题方法
【推荐1】已知抛物线C:
与直线
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(1)求C的方程;
(2)过C的焦点F的直线l与C交于A,B两点,AB的中垂线与C的准线交于点P,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
(1)求C的方程;
(2)过C的焦点F的直线l与C交于A,B两点,AB的中垂线与C的准线交于点P,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7dd449cbff87d9e7cf8b7183fd1edd.png)
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【推荐2】已知抛物线
与双曲线
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的方程;
(2)过
且斜率存在的直线与
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,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22fb42f813e658f9a924182df4d5d1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85af6eaff9a4e3e9af4e9c1f4f7b996.png)
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