已知抛物线的准线方程为
,直线l与抛物线交于
两点,O为坐标原点.
(1)若
为等腰直角三角形,求
的面积;
(2)若
,证明:直线l过定点P,并求出定点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
更新时间:2024-02-21 21:11:27
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相似题推荐
解答题-问答题
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【推荐1】若抛物线
的准线为
,椭圆
的一个焦点与抛物线
的焦点重合,且以原点为圆心,椭圆
的短半轴长为半径的圆与直线
相切.
(1)求椭圆
的离心率;
(2)若
为坐标原点,过点(2,0)的直线
与椭圆
相交于不同两点A、B,且椭圆
上一点
满足
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c156c3b344e637b4f86404f2711940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2cfc8743c915f45bdccca70ab16648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9332a452cefed95e41d032f571621e0.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)若
![](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/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820df20141a476269acfe17e39d815aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】已知抛物线C:
,直线
与抛物线C交于A,B两点.
(1)若直线
过抛物线C的焦点,求
.
(2)已知抛物线C上存在关于直线
对称的相异两点M和N,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d047b1683b339b66921db610468af949.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
(2)已知抛物线C上存在关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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【推荐1】如图,直线l:y=kx+b与抛物线x2=4y相交于不同的两点A(x1,y1)、B(x2,y2),且|x1﹣x2|=h(h为定值),线段AB的中点为D,与直线l平行的抛物线x2=4y的切线的切点为C
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/d6c638c7-7a46-46f3-a9fe-d9b7d639052c.png?resizew=253)
(1)用k、b表示出点C、点D的坐标,并证明CD垂直于x轴;
(2)求△ABC的面积(只与h有关,与k、b无关);
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/d6c638c7-7a46-46f3-a9fe-d9b7d639052c.png?resizew=253)
(1)用k、b表示出点C、点D的坐标,并证明CD垂直于x轴;
(2)求△ABC的面积(只与h有关,与k、b无关);
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【推荐2】已知抛物线
上有一点
.
(1)求抛物线的标准方程;
(2)已知直线
与抛物线交于
两点,F是抛物线的焦点,且
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7cc20a41e422a6200340562b330ba3.png)
(1)求抛物线的标准方程;
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9b279ad70031f2629802dbb470352a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75d5df8424b11b03b64b36586ab8a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
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解答题-证明题
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【推荐1】已知抛物线
的焦点为
,,若点
在抛物线上,且
.
(1)求抛物线
的方程;
(2)设直线
与抛物线
交于
两点,若
,求证:线段
的垂直平分线过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9c9e4c323dbf2cd2d53881dc40bea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d4a2a035d302744fed6f65daa4ac55.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设直线
![](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/bd1dc85723f64c4d545ccc4e4200fcab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】设抛物线
,过
轴上点
的直线
与
相切于点
,且当
的斜率为
时,
.
(1)求
的方程;
(2)过
且垂直于
的直线交
于
两点,若
为线段
的中点,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da160ad8a0cddbbce70e760a1a96ff30.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
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【推荐1】已知抛物线C:
的焦点为F,直线
交抛物线
于
、
两点,
是线段
的中点,过
作
轴的垂线交抛物线
于点
.
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572159917670400/1572159923355648/STEM/4414e0bac7fd4da28a8b28078491218a.png)
(1)若直线AB过焦点F,求
的值;
(2)是否存在实数
,使
是以
为直角顶点的直角三角形?若存在,求出
的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572159917670400/1572159923355648/STEM/bbe9c838cf9e424189fcf89da31597d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37de4a3de86448b6811d6c938b9aa2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572159917670400/1572159923355648/STEM/4414e0bac7fd4da28a8b28078491218a.png)
(1)若直线AB过焦点F,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7183f8ff3a9ad590ae4229df386708.png)
(2)是否存在实数
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572159917670400/1572159923355648/STEM/6da01e8894444570a6d5aace34640d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef20db1149c70c6b4c1655712292551b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572159917670400/1572159923355648/STEM/6da01e8894444570a6d5aace34640d2d.png)
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【推荐2】设抛物线C:y2=4x的焦点为F,过F的直线l与C交于A,B两点,点M的坐标为(﹣1,0).
(1)当l与x轴垂直时,求△ABM的外接圆方程;
(2)记△AMF的面积为S1,△BMF的面积为S2,当S1=4S2时,求直线l的方程.
(1)当l与x轴垂直时,求△ABM的外接圆方程;
(2)记△AMF的面积为S1,△BMF的面积为S2,当S1=4S2时,求直线l的方程.
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