如图,已知抛物线
的焦点为F,准线与x轴的交点为M.过点F的直线与抛物线交于A、B两点.
(1)若点A在第一象限,且
,求直线AB的倾斜角;
(2)若点M在以线段AB为直径的圆周上,求直线AB的方程;
(3)设直线AM、BM分别与y轴交于P、Q两点,记
、
的面积分别为
、
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/6c7523ff-6eb0-4f2d-9a83-76f915dd482d.png?resizew=130)
(1)若点A在第一象限,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56bbafa889700c6764ebc7fc1a42cd91.png)
(2)若点M在以线段AB为直径的圆周上,求直线AB的方程;
(3)设直线AM、BM分别与y轴交于P、Q两点,记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a11cb104b04c4e6a1be700e81da279a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a9dabb53dc826019fc8b6ae6d940c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
更新时间:2023-05-19 23:34:19
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解题方法
【推荐1】已知抛物线
的焦点到准线间的距离为2,且点
抛物线C上.
(1)求m的值;
(2)若直线l与抛物线C交于A,B两点,且
,
于点D,
,求DQ的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e23b74ed51912d236727c0ee5e3e64.png)
(1)求m的值;
(2)若直线l与抛物线C交于A,B两点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a291e0d0e2f620a15826a1aa3c04bc37.png)
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【推荐2】已知抛物线
的焦点为F,抛物线C上A,B两点满足
,线段
的中点为M,过点M作抛物线C的准线的垂线,垂足为M,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c507610f462120218e2cd1894c957eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6ade057ab86a163fe06d4a101b62b5.png)
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【推荐1】已知点F为抛物线
的焦点,点
,点A为抛物线C上的动点,直线
(t为常数)截以
为直径的圆所得的弦长为定值.
(1)求焦点F的坐标;
(2)求实数t的值;
(3)若点
,过点A的直线
交抛物线于另一点B,
的中垂线过点D,求m的值和
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88eec86c17ca9025e2a6c7db421f5c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bbb2a23bb28d443062ae3e1a30b1be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39fd8404d5d33c3bfb5f49ca57218732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)求焦点F的坐标;
(2)求实数t的值;
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103a1e71df66890dd5f29c8fb096d153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
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【推荐2】设椭圆
,抛物线
的顶点为坐标原点O,焦点在x轴上,并且经过点
,过
的焦点F作直线l,与
交于A,B两点,
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963638566428672/2965841162076160/STEM/5bf11d14-2057-4d1d-8f2f-33d05562a2f9.png?resizew=180)
(1)求
的标准方程;
(2)设M是
准线上一点,直线MF的斜率为
,MA、MB的斜率依次为
、
,请探究:
与
的关系;
(3)若l与
交于C,D两点,
为
的左焦点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8182955e08c6b0f37dff638dddf38a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaafb050b24c4e806c480e0665aaa5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a53781beb20685906f3d9f42f60a3f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaafb050b24c4e806c480e0665aaa5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaafb050b24c4e806c480e0665aaa5a.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963638566428672/2965841162076160/STEM/5bf11d14-2057-4d1d-8f2f-33d05562a2f9.png?resizew=180)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaafb050b24c4e806c480e0665aaa5a.png)
(2)设M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaafb050b24c4e806c480e0665aaa5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed1e9cdd5a82f29ec89b2c53b4fa6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed1e9cdd5a82f29ec89b2c53b4fa6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
(3)若l与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce30fc0664cca88dbe6d38f32aee81e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b519e5794ef9932b64715619adf860db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce30fc0664cca88dbe6d38f32aee81e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf8be999cc578ebab2083241cf3b195.png)
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【推荐1】已知抛物线
,
为其焦点,
,
三点都在抛物线
上,且
,设直线
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.
(1)求抛物线
的方程,并证明
;
(2)已知
,且
三点共线,若
且
,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b9bd3533b803fa727c4da6c9e1b269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667cb59b1d1cb18b48d881b154013650.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0fc536d6f07ae58c45cb6dd98eec80.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d522880a029789bae035a04383fa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc44299a4ce82839a8bc589c3d706e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200c21c7c8fb88832addad8457ca8c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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解题方法
【推荐2】已知O为原点,抛物线
的准线与y轴的交点为H,P为抛物线C上横坐标为4的点,已知点P到准线的距离为5.
(1)求C的方程;
(2)过C的焦点F作直线l与抛物线C交于A,B两点,若以AH为直径的圆过B,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a18c8c807043ffddb4728fb053a0ee2.png)
(1)求C的方程;
(2)过C的焦点F作直线l与抛物线C交于A,B两点,若以AH为直径的圆过B,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10de9876a12374ae09cbd64a7d05fec2.png)
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