已知在平面直角坐标系
中,抛物线
的准线方程是
.
(1)求抛物线的方程;
(2)直线
过点
与抛物线交于
、
两点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
(1)求抛物线的方程;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.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/3825ccc273ef9a672a606432d165b866.png)
更新时间:2022-11-28 20:56:31
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相似题推荐
【推荐1】椭圆:
的焦点到直线
的距离为
,离心率为
.抛物线
的焦点与椭圆
的焦点重合,斜率为
的直线
过
的焦点与
交于
,与
交于
.
(1)求椭圆
及抛物线
的方程;
(2)是否存在常数
,使得
为常数?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a200ca2c4af794f4d1c6a5443830b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934afdd41b042c53d1e54bc73a8713e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)是否存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7076a8b98ee710f7da92db54ef1ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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(0.65)
名校
【推荐2】已知抛物线
的焦点为F,点B为抛物线准线上一点,点A为抛物线上一点,O为坐标原点.
(1)若AB垂直于准线,且
是斜边为4的等腰直角三角形,求抛物线的标准方程;
(2)若
,且OA为∠FOB的角平分线,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
(1)若AB垂直于准线,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaceb8d6c6927e14d9ac7a557a2b11d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6981ddd38a2f42f966ef87220faa95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
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适中
(0.65)
真题
【推荐1】已知过抛物线
的焦点,斜率为
的直线交抛物线于![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fb7d21d0993a5e4eaebd987036dbbe.png)
(
)两点,且![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/08f9d843e6d742bdb76cf20d876b41fa.png?resizew=54)
(1)求该抛物线的方程;
(2)
为坐标原点,
为抛物线上一点,若
,求
的值
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/a74a1027b9204b56a05caa1e474fb596.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/2facef08bb3a415890705ebee273da72.png?resizew=34)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fb7d21d0993a5e4eaebd987036dbbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/08f9d843e6d742bdb76cf20d876b41fa.png?resizew=54)
(1)求该抛物线的方程;
(2)
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/11f0b683c96144d5a843f5f8bc014701.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/ea5ee41ef45f4f17835ac01abd3956b4.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/e0179a87b6354cddbfa753987c88cf3a.png?resizew=110)
![](https://img.xkw.com/dksih/QBM/2011/9/2/1570300614828032/1570300620070912/STEM/9b89f5876fc64344aeb76b61b79b897f.png?resizew=14)
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解题方法
【推荐2】过坐标原点
作圆
的两条切线,设切点为
,直线
恰为抛物线
的准线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/d5b03bee-d1ab-497b-bbe6-42097017ce62.png?resizew=202)
(1)求抛物线
的标准方程;
(2)设点
是圆
的动点,抛物线
上四点
满足:
,
,设
中点为
.
(i)证明:
垂直于
轴;
(ii)设
面积为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f042ef370b38415c993fd0434e2213a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c42d88e496a17562d25195301e0ac2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/d5b03bee-d1ab-497b-bbe6-42097017ce62.png?resizew=202)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d63368fb5c4feebe59c81bd5c90d8eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc4f370ce4d68bdcf3df933964e3767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382c9e6d6c0e106cd43d0550a2177cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(i)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1ab6c10bc0a8bfbdc3b4824c2de1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(ii)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04e30d5827f2120d997997e4e31ba17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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