1 . 已知椭圆
的左右焦点分别为
,
,焦距为4,直线
与椭圆相交于
,
两点,
关于直线
的对称点为
斜率为
的直线
与线段
相交于点
,与椭圆相交于
,
两点.
(1)求椭圆的标准方程.
(2)求四边形
的面积取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.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/3f5d3bd6a9b8366f3016a036f869cd6d.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/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11efa868e44e27ffa8e5049f2202af45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/640b7894-93e6-4aba-945e-84c4d4b9a912.png?resizew=219)
(1)求椭圆的标准方程.
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1003c2b33b7c62519e8e2c59b19ffd2d.png)
您最近一年使用:0次
2021-01-19更新
|
120次组卷
|
7卷引用:【全国市级联考】江西省南昌市2017-2018学年度高三第二轮复习测试卷理科数学(五)试题
名校
2 . 已知椭圆
的短轴长为2,椭圆的离心率为
.过点
的直线
与椭圆
相交于
,
两点,线段
的中点为
且不与原点重合.
(1)求椭圆
的方程;
(2)若
轴上的一点
满足
,求证:线段
的中点在定直线上;
(3)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6b94e42869013745050aba059b58dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb66dc6f2da7251ee614987a6066065e.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d344c4876db606024d81e6de01fe06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce2790947716b1cfa9c5e7a65db4093.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d7e6d4149b9eda735e01e486f591b8.png)
您最近一年使用:0次
2021-01-09更新
|
145次组卷
|
2卷引用:江西省南昌市第十中学2020-2021学年高二上学期第二次月考数学(理)试题
名校
3 . 已知椭圆
的上顶点为P,右顶点为Q,直线PQ与圆
相切于点
.
(1)求椭圆C的方程;
(2)若不经过点P的直线
与椭圆C交于A,B两点,且
=0,求证:直线l过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2845cff59808d0945644a6c867e40740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12107f5e60cd9c834a5c2ce9b1781294.png)
(1)求椭圆C的方程;
(2)若不经过点P的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33e5d0dbdd0f15854f0d7dd8b53058.png)
您最近一年使用:0次
2021-01-03更新
|
1258次组卷
|
7卷引用:2019届百师联盟新高三开学摸底考(全国I卷)文科数学试题
2019届百师联盟新高三开学摸底考(全国I卷)文科数学试题2019届百师联盟新高三开学摸底考(全国II卷)文科数学试题(已下线)考点53 圆锥曲线的综合问题-定点、定值和探索性问题(考点)-备战2021年新高考数学一轮复习考点微专题(已下线)专题9.6 直线与圆锥曲线(精讲)-2021年高考数学(文)一轮复习学与练江西省新余市2022届高三上学期期末数学(理)试题安徽省皖江名校联盟2020-2021学年高二下学期开年考理科数学试题甘肃省天水市第一中学2020-2021学年高三上学期第四次考试数学(理)试题
名校
4 . 已知点
,圆
,
为
上一动点,连接
,
,设
线段
的中点,
为
上一点,且满足
,动点
形成曲线
.
(1)求
的取值范围;
(2)直线
与曲线
是否相切?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6cffa52177f31cd10c42d00f69d4da1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4216f8c5ae9fcfc9884a31d379878da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aec88bb5ec73039f9fec14013ea5a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2288109e13b7dd099f8dba9bd4997c.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
您最近一年使用:0次
2020-12-31更新
|
232次组卷
|
3卷引用:重庆市强基联合体2021届高三上学期质量检测数学试题
名校
解题方法
5 . 已知椭圆
:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
.圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
的圆心
在椭圆
上.点
到椭圆
的右焦点的距离为
.
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611897288654848/2613455885336576/STEM/12aec4fd-f1f6-4611-86c4-e0e0a605122e.png?resizew=306)
(1)求椭圆
的方程;
(2)过点
作互相垂直的两条直线
,
,且
交椭圆
于
,
两点,直线
交圆
于
,
两点,且
为
的中点,求
的面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434249d6640b0c1a712d215cf8b83d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441f06d70c0e009e84d44f7d581d48d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df31c675af44a719b896de0f4bb163db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611897288654848/2613455885336576/STEM/12aec4fd-f1f6-4611-86c4-e0e0a605122e.png?resizew=306)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.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/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a11cb104b04c4e6a1be700e81da279a.png)
您最近一年使用:0次
2020-12-13更新
|
360次组卷
|
11卷引用:江西省上高县第二中学2016-2017学年高二第七次月考(5月)数学(理)试题
江西省上高县第二中学2016-2017学年高二第七次月考(5月)数学(理)试题2016届山西晋城市高三下学期三模考试理数学试卷2017届重庆市巴蜀中学高三上月考一数学(理)试卷四川省成都市双流中学2018届高三上学期9月月考数学(文)试题(已下线)《2018届优生-百日闯关系列》数学专题三 第二关 以解析几何中与椭圆相关的综合问题【全国百强校】黑龙江省大庆实验中学2017-2018学年高二下学期期中考试数学(文)试题【全国百强校】内蒙古杭锦后旗奋斗中学2018-2019学年高二上学期第二次(12月)月考数学(理)试题【全国百强校】江苏省如东高级中学2018-2019学年高二上学期第二次月考数学试题山东省济南市历城第二中学2019-2020学年高二上学期12月月考数学试卷辽宁省本溪市重点高中2020-2021学年高二12月月考数学试题黑龙江省哈尔滨市第九中学校2023-2024学年高二上学期12月月考数学试题
名校
6 . 已知椭圆
的离心率为
,且椭圆上一点与椭圆的两个焦点构成的三角形的周长为
.
(1)求椭圆
的方程;
(2)设直线
与椭圆
交于
、
两点,若以
为直径的圆经过椭圆的右顶点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cf6cca367ce2afd96d7d951f9587e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c14ff9b66f21c05e52dc3c8908c2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3643fa70165ed9fef1398bc9443e7a02.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf46f98449e6b3cd06d129d003ae32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2020-12-11更新
|
395次组卷
|
7卷引用:海南省海口市海南中学2020-2021学年高二上学期期中考试数学试题
名校
解题方法
7 . 已知椭圆
的中心在坐标原点
,焦点在
轴上,离心率为
,右焦点到右顶点的距离为1.
(1)求椭圆
的标准方程.
(2)是否存在与椭圆
交于
,
两点的直线
:
,使得
成立?若存在,求出实数
的取值范围;若不存在,请说明理由.
(3)若动直线
与椭圆
有且仅有一个公共点,试问:在
轴上是否存在两定点,使其到直线
的距离之积为3?若存在,求出两定点坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)是否存在与椭圆
![](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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62abf2e916f10b7d33077a6a8857f14d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
您最近一年使用:0次
2020-12-11更新
|
452次组卷
|
2卷引用:四川省成都市锦江区成都市盐道街中学2019-2020学年高二上学期期中数学文科试题
名校
解题方法
8 . 已知椭圆
经过点
,且两个焦点为
,
.
(1)求C的方程;
(2)设圆
,若直线l与椭圆C,圆D都相切,切点分别为A和B,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a7a78a0cb55d2396f7213432a86b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17618d8d22ebb3fd6835a7eb139b4f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13683e2ecf2164a0adbfdb9923d210a3.png)
(1)求C的方程;
(2)设圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a532e4e8919ab8423e5873db1e601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
您最近一年使用:0次
2020-12-09更新
|
581次组卷
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6卷引用:辽宁省丹东市2020届高三下学期总复习质量测试(二)数学(理)试题
辽宁省丹东市2020届高三下学期总复习质量测试(二)数学(理)试题辽宁省丹东市2020届高考理科数学二模试卷山西省2021届高三上学期八校联考数学(文)试题江西省赣州市赣县第三中学2020-2021学年高二2月入学考试数学(理)试题(已下线)第46讲 范围、最值、定点、定值及探索性问题(练) — 2022年高考数学一轮复习讲练测(课标全国版)(已下线)专题44 巧求圆锥曲线中的最值和范围问题-学会解题之高三数学万能解题模板【2022版】
20-21高三上·江西南昌·阶段练习
名校
解题方法
9 . 已知椭圆的中心在坐标原点O,焦点在x轴上,椭圆的长轴长为
,离心率为
.
(1)求椭圆的方程;
(2)直线l过点
椭圆相交于A,B两点,当
面积为
时,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
(1)求椭圆的方程;
(2)直线l过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a152eb036203fd4a9160f6f29115bc85.png)
您最近一年使用:0次
2020高三·全国·专题练习
名校
解题方法
10 . 已知椭圆
:
(
)的四个顶点组成的四边形的面积为
,且经过点
.过椭圆右焦点
作直线
与椭圆
交于
、
两点.
(1)求椭圆
的方程;
(2)若
,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec6a04eff902b67e225bf1e51f378ce.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
2020-12-06更新
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2269次组卷
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13卷引用:专题52 平面解析几何专题训练-2021年高考一轮数学(文)单元复习一遍过
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