名校
解题方法
1 . 已知点F是椭圆
的右焦点,点
到椭圆上的动点Q的距离的最大值不超过
,当椭圆的离心率取到最大值时,则
的最大值等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b24214f111f7c6d2b64e53ad970438b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e298293515d3c5d8343b668fe8541d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea5cb87c8d7fba3b0abe72a6dc52de6.png)
您最近一年使用:0次
2022-03-30更新
|
2229次组卷
|
10卷引用:福建省晋江市第一中学2021-2022学年高二上学期期中考试数学试题
福建省晋江市第一中学2021-2022学年高二上学期期中考试数学试题上海市控江中学2021-2022学年高二下学期期末数学试题(已下线)2.2椭圆(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020选修第一册)新疆生产建设兵团第六师五家渠高级中学2022-2023学年高二上学期期末数学试题(已下线)高二上学期期中【压轴60题考点专练】(选修一全部内容)-2022-2023学年高二数学考试满分全攻略(人教A版2019选修第一册)(已下线)第2章 圆锥曲线 (单元重点综合测试)-2023-2024学年高二数学单元速记·巧练(沪教版2020选择性必修第一册)上海市杨浦高级中学2023-2024学年高二下学期3月月考数学试卷(已下线)专题19 圆锥曲线 (练习)-1(已下线)模拟检测卷02(理科)江西省宜春市宜丰县宜丰中学2024届高三上学期12月月考数学试题
名校
解题方法
2 . 1.在平面直角坐标系
中,椭圆
:
的离心率为
,焦距为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/be9ccdf9-1a3e-48be-98d0-c5da85f95fd8.png?resizew=221)
(1)求椭圆
的方程;
(2)如图,动直线
:
交椭圆
于A,
两点,
是椭圆
上一点,直线
的斜率为
,且
,
是线段
延长线上一点,且
,
的半径为
,
,
是
的两条切线,切点分别为S,
.求
的最小值及
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/be9ccdf9-1a3e-48be-98d0-c5da85f95fd8.png?resizew=221)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图,动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394d3d55b68bd014b2a743da6bc0bbd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b728c0e69820cdcd839e67ffdb1014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77c7fcf5a32774e6e0c46bb6e3618a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc28b3e3b151b74ace297c6af574cac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d66b83d9dbcb45e1c241d18a3e1843f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6542e3902685bc6c6e7338eeff7db0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0a0f726fad67e97d5864dec65cb5c6.png)
您最近一年使用:0次
2021-11-14更新
|
1509次组卷
|
5卷引用:福建师范大学附属中学2022-2023学年高二上学期期末考试数学试题
21-22高三上·上海浦东新·阶段练习
3 . 已知椭圆M:
的左、右焦点分别为
、
,
,点
在椭圆M上.
![](https://img.xkw.com/dksih/QBM/2021/9/25/2815931589443584/2818812007751680/STEM/3f7837fa941c46a38a416e5ed845eaec.png?resizew=263)
(1)求椭圆M的方程;
(2)过
的直线l与椭圆M交于P、Q两点,且
,求直线l的方程;
(3)如图,四边形ABCD是矩形,AB与椭圆M相切于点F,AD与椭圆M相切于点E,BC与椭圆M相切于点G,CD与椭圆M相切于点H,求矩形ABCD面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed6b9540857e386651e191a0a5b5a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02405d53570a6239915cf1dbd6602ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a34c05f42912d1f3fa4329177dd2ff.png)
![](https://img.xkw.com/dksih/QBM/2021/9/25/2815931589443584/2818812007751680/STEM/3f7837fa941c46a38a416e5ed845eaec.png?resizew=263)
(1)求椭圆M的方程;
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe72f39947dffe8d19b5c4e12666b27.png)
(3)如图,四边形ABCD是矩形,AB与椭圆M相切于点F,AD与椭圆M相切于点E,BC与椭圆M相切于点G,CD与椭圆M相切于点H,求矩形ABCD面积的取值范围.
您最近一年使用:0次
解题方法
4 . 已知椭圆
的左、右焦点分别为
、
,离心率为
,M是椭圆上的动点,
的最大面积为1.
(1)求椭圆
的方程;
(2)求证:过椭圆
上的一点
的切线方程为:
;
(3)设点P是直线
上的一个动点,过P作椭圆
的两条切线,切点分别为A,B,则直线AB是否过定点?若是,求出这个定点坐标,否则,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bfa5840675e634a9f5e1f602775e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42fc33bcfc63ec2f4940ccd3f862400.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(2)求证:过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bfa5840675e634a9f5e1f602775e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00be25c38b5f65f20babdf43572b5d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b2724de4e50b21a19c1e02ec3abb48.png)
(3)设点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbd8a5d973b7a54b7605388fdcfbb07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
您最近一年使用:0次
名校
解题方法
5 . 已知椭圆
:
过点
,且离心率为
,过点
的直线
与椭圆
交于
,
两点.
(1)求椭圆
的标准方程;
(2)若点
为椭圆
的右顶点,探究:
是否为定值,若是,求出该定值,若不是,请说明理由.(其中,
,
分别是直线
、
的斜率)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfdd0414492894e63277223fddfe2ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668d61a88b296ebd55a3b0bbc277539a.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63e9a213f3dd57269cf4ff02d6212e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1456e81321ccb20077b34562ca9cffbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090b7ee52d644d0c630ef44aec1726dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
您最近一年使用:0次
2018-01-21更新
|
886次组卷
|
7卷引用:福建省漳州市华安县第一中学2023-2024学年高二上学期期末练习数学试题
名校
6 . 如图,椭圆
:
的右焦点为
,右顶点、上顶点分别为点
,
已知椭圆
的焦距为
,且
.
![](https://img.xkw.com/dksih/QBM/2017/11/17/1819158471475200/1822147915161600/STEM/6eb3d3b41b0f42e48924c3b4cc23bc9c.png?resizew=207)
(1)求椭圆
的方程;
(2)若过点
的直线
交椭圆
于
两点,当
面积取得最大时,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0dce10bf671cc2ebc67aa7fd568a9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
已知椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c4cd6e58ff472c1d61a6ebfa7762ec.png)
![](https://img.xkw.com/dksih/QBM/2017/11/17/1819158471475200/1822147915161600/STEM/6eb3d3b41b0f42e48924c3b4cc23bc9c.png?resizew=207)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0af1a9647a129a692715564967a8ef6.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/d9cd0efc142e3abb0d8f21e6447f0a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
2017-12-12更新
|
1141次组卷
|
2卷引用:福建省莆田市仙游第一中学2017-2018学年高二上学期期中考试数学试题
7 . 已知动圆
过定点
,并且内切于定圆
.
(1)求动圆圆心
的轨迹方程;
(2)若
上存在两个点
,(1)中曲线上有两个点
,并且
三点共线,
三点共线,
,求四边形
的面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d6f746c2355072d914591bf60c3801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0430d333cd603bc096ca3cb592ab6e.png)
(1)求动圆圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d676ff4bf2f8e136835a0a702ebe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c485045b8cc718cfabee23fe984f82a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7555f635da615b09b7e2f08ddbeaf1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99393efa04579f3db5cf4f7e319f0440.png)
您最近一年使用:0次
2017-04-13更新
|
638次组卷
|
2卷引用:福建省泉州市晋江学校2023-2024学年高二上学期第二次月考数学试题
名校
8 . 已知椭圆
:
的四个顶点组成的四边形的面积为
,且经过点
.
![](https://img.xkw.com/dksih/QBM/2019/3/23/2166836469366784/2168057961062400/STEM/430bea2feb9549dfb1c6dc293ca12e2e.png?resizew=193)
(1)求椭圆
的方程;
(2)若椭圆
的下顶点为
,如图所示,点
为直线
上的一个动点,过椭圆
的右焦点
的直线
垂直于
,且与
交于
,
两点,与
交于点
,四边形
和
的面积分别为
,
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe8530b8e246a9a5ec9fe3b9c347d5a.png)
![](https://img.xkw.com/dksih/QBM/2019/3/23/2166836469366784/2168057961062400/STEM/430bea2feb9549dfb1c6dc293ca12e2e.png?resizew=193)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b67f38247dea57c3167f02de51cf3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb556e962e111e59c345be7240e202c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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2016-12-04更新
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3039次组卷
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8卷引用:福建省莆田第一中学2021-2022学年高二上学期期末考试数学试题
9 . 已知
是椭圆的
左、右焦点,过点
作倾斜角为
的
动直线
交椭圆于
两点.当
时,
,且
.
(1)求椭圆的离心率及椭圆的标准方程;
(2)求
面积的最大值,并求出使面积达到最大值时直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f7d5b1f1603ec8065777af68c1b7b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ec56b59d6f2654570c2b5c4fd13a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ab55147ca5c0f958af43b0637ee31b.png)
动直线
![](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/da2d7c12c9fb370bb438e8ae38dfd2ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f517c0d4d51920e4a9708157784093d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689b553f14ed5d5015ab85ee3b90e871.png)
(1)求椭圆的离心率及椭圆的标准方程;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f3f7cb120477b49faa001514887e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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10 . 在平面直角坐标系
中,点
到两点
的距离之和等于4,设点
的轨迹为
.
(1)写出曲线
的方程;
(2)设直线
与曲线
交于A、B两点,
为何值时,
,此时
的值为多少?
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/f8c01c92f0d540f48693963255321cf6.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/481a972a4f734ae9abc2e6d9e70b657a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/53c5f8b6400947d2b530a596209442d0.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/481a972a4f734ae9abc2e6d9e70b657a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/50951a7163fd40e59675c66b0696dc6a.png)
(1)写出曲线
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/50951a7163fd40e59675c66b0696dc6a.png)
(2)设直线
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/165914d03fb340158cad4a9fac8599d1.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/50951a7163fd40e59675c66b0696dc6a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/d120abc7835d4b13bb99e0f9b4077043.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/ee48e84639dd494582b88d9fb5c41a15.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572467990872064/1572467997007872/STEM/ae22ed73454c423f9502340b04d8f477.png)
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