2014·福建福州·一模
1 . 如图,直线y=m与抛物线y2=4x交于点A,与圆(x-1)2+y2=4的实线部分交于点B,F为抛物线的焦点,则三角形ABF的周长的取值范围是
![](https://img.xkw.com/dksih/QBM/2016/1/21/1572455941390336/1572455947354112/STEM/8474d18e-c197-4c42-8f9e-ddb40dc66979.png?resizew=191)
![](https://img.xkw.com/dksih/QBM/2016/1/21/1572455941390336/1572455947354112/STEM/8474d18e-c197-4c42-8f9e-ddb40dc66979.png?resizew=191)
A.(2,4) | B.(4,6) | C.[2,4] | D.[4,6] |
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2 . 已知抛物线
的准线与坐标轴交于点
,
为抛物线第一象限上一点,
为抛物线焦点,
为
轴上一点,若
,
,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ee992c0a541d901ff9f38c039e2de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d095618cf4f87caa3be268d8688a049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732cec9be51dde8cc5d4d9c105a87c85.png)
A.![]() | B.![]() | C.![]() | D.2 |
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解题方法
3 . 已知P是抛物线
上一点,F是该抛物线的焦点,则以PF为直径且过(0,2)的圆的标准方程为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
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2011·福建莆田·一模
解题方法
4 . 点P是抛物线
上一动点,则点P到y轴距离与点P到点A
距离之和的最小值等于_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be3ad3dd6803d92df6ff8a80cd35095.png)
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2013·福建漳州·三模
名校
5 . 已知抛物线y2 =4x的焦点为F,准线为
交于A,B两点,若△FAB为直角三角形,则双曲线的离心率是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d73f3b188a20e20f20bba494e37458e.png)
A.![]() | B.![]() | C.2 | D.![]() |
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6 . 已知
为坐标原点,矩形
的顶点A,C在抛物线
上,则顶点B的轨迹方程为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.png)
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2014·福建三明·一模
7 . (已知抛物线
(
)的准线与
轴交于点
.
(1)求抛物线的方程,并写出焦点坐标;
(2)是否存在过焦点的直线
(直线与抛物线交于点
,
),使得三角形
的面积
?若存在,请求出直线
的方程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0aa23696b63c7d2d2950980a2c8cdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9112b0a125ed7ddc5fca7f031f94acdc.png)
(1)求抛物线的方程,并写出焦点坐标;
(2)是否存在过焦点的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc02b973dacafdfa70746faf42c8a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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8 . 在平面直角坐标系
中,点
在抛物线
的准线上,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55105bb79f49beae0bb6de488994f84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec68c680d1b8c8cfa98b48a27d2c46a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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9 . 抛物线
上的点P到它的焦点F的最短距离为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
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名校
解题方法
10 . 已知抛物线
的准线
与圆
相切.
(1)求
的方程;
(2)点
是
上的动点,且
,过点
作圆
的两条切线分别与
交于
两点,求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7775aa57ca0e62216f3039ed88dceed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f702bfe1a376398286f1dc3daf8c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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