1 . 已知
为坐标原点,椭圆
的左右焦点分别为
,
,
为椭圆的上顶点,以
为圆心且过
的圆与直线
相切.
(1)求椭圆
的标准方程;
(2)已知直线
交椭圆
于
两点.
(ⅰ)若直线
的斜率等于
,求
面积的最大值;
(ⅱ)若
,点
在
上,
.证明:存在定点
,使得
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0ff5e0d149dd9153dbe72f03435d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d9da11b6082b4bc914e43a277afad3.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知直线
![](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/7789a500686c7a73770404ead6af0590.png)
(ⅰ)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
(ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a049b98bd26f2ace2be1c7211fcf313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b33693ae164d2f57bd15664016f8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76546ca21849bd5772008761f28692e7.png)
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2020-12-05更新
|
1087次组卷
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8卷引用:江西省奉新县第一中学2021届高三上学期第五次月考数学(理)试题
2 . 如图:已知抛物线
:
与椭圆
:
有相同焦点
,
为抛物线
与椭圆
在第一象限的公共点,且
,过焦点
的直线
交抛物线
于
,
两点、交椭圆
于
,
两点,直线
,
与抛物线
分别相切于
,
两点.
![](https://img.xkw.com/dksih/QBM/2020/12/1/2605011111460864/2606904181981184/STEM/bc6e0c0906914e11969f8ed2164eb85c.png?resizew=206)
(1)求椭圆
的方程;
(2)求
的面积
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c9bebea391a1f9956dfcca98d9d1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/e44929ae82e37ac8394445f3c3cc2fb0.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/b1241216f3c1cb5e73043dd1037f556d.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/23f3ffe7abc59e2f65d827c8eab8d36a.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/1/2605011111460864/2606904181981184/STEM/bc6e0c0906914e11969f8ed2164eb85c.png?resizew=206)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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2020-12-04更新
|
862次组卷
|
3卷引用:浙江省台州市六校2020-2021学年高三上学期期中联考数学试题
9-10高二下·河北·期末
名校
解题方法
3 . 已知椭圆
的离心率为
,其左、右焦点分别为
,
,点
是坐标平面内一点,且
,
(O为坐标原点).
(1)求椭圆C的方程;
(2)过点
且斜率为k的动直线l交椭圆于A,B两点,在y轴上是否存在定点M,使以
为直径的圆恒过这个点?若存在,求出M的坐标,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.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/7775aa57ca0e62216f3039ed88dceed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15d1c30154343692f788d82c73e14d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4d7a35061cb450ffac75f6709612f2.png)
(1)求椭圆C的方程;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6831c6674f4bf86df7c8dd730e1c187d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2020-11-29更新
|
1446次组卷
|
13卷引用:江西省新余市2016-2017学年高二下学期期末质量检测数学(文)试题
江西省新余市2016-2017学年高二下学期期末质量检测数学(文)试题(已下线)2010年正定中学高二下学期期末考试数学试题(已下线)2011届广西桂林中学高三高考模拟考试文数(已下线)2012届河南省中原六校高三第一次联考理科数学试卷(已下线)2013届安徽省宿州市泗县二中高三第三次模拟理科数学试卷2016届山西省山西大学附中高三10月月考理科数学试卷2016届山西省山西大学附中高三10月月考文科数学试卷【全国百强校】湖北省华中师范大学第一附属中学2018-2019学年高二上学期期末考试数学(文)试题云南省昆明市官渡区2021届高三上学期两校联考数学试题(已下线)黄金卷09-【赢在高考·黄金20卷】备战2021高考数学全真模拟卷(新高考专用)广东省东莞市光明中学2021届高三下学期期初考试数学试题(已下线)专题43 巧解圆锥曲线中的定点和定值问题-学会解题之高三数学万能解题模板【2022版】广东省佛山市顺德区第一中学2024届高三上学期11月月考数学试题
4 . 已知椭圆标准方程为
,离心率为
且过点
,直线
与椭圆交于
、
两点且不过原点.
(1)求椭圆方程;
(2)若
,求证:直线
经过定点,并求出定点坐标;
(3)若直线
、
、
的斜率依次成等比数列,求
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(1)求椭圆方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e8b17a7840ae7b75590da92fa0965b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
您最近一年使用:0次
2020-11-25更新
|
776次组卷
|
4卷引用:江苏省扬州市高邮市2020-2021学年高二上学期期中学情调研数学试题
名校
解题方法
5 . 如图,椭圆C:
的离心率
,椭圆C的左、右顶点分别为A,B,又P,M,N为椭圆C上非顶点的三点.设直线
,
的斜率分别为
,
.
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599040898785280/2599855425036288/STEM/32977712-9541-471d-aadb-f96df6d147a2.png)
(1)求椭圆C的方程,并求
的值;
(2)若
,
,判断
的面积是否为定值?若为定值,求出该定值;若不为定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eeb89acc4e562de9d2c433fe9cbf15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075ba8c6fb5ef7288cd3fed425c8e69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599040898785280/2599855425036288/STEM/32977712-9541-471d-aadb-f96df6d147a2.png)
(1)求椭圆C的方程,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b881044b5c73db6fcce110525741b02.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7092eab640645009b43b1912401702fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e6a20f58944d2362064423f79bba25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
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2020-11-24更新
|
410次组卷
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8卷引用:江西省临川一中暨临川一中实验学校2020-2021学年高二上学期期中考试数学(文)试题
名校
6 . 已知
,
是椭圆
的左、右焦点,圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca892142a8e59416acd3d78aa5f8c69.png)
与椭圆有且仅有两个交点,点
在椭圆上.
(1)求椭圆的标准方程;
(2)过y正半轴上一点P的直线l与圆O相切,与椭圆C交于点A,B,若
,求直线l的方程.
![](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/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca892142a8e59416acd3d78aa5f8c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea187e438b0cebc0caae1a03bd17e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18430e4b562d2ae985c5d03138e46bc1.png)
(1)求椭圆的标准方程;
(2)过y正半轴上一点P的直线l与圆O相切,与椭圆C交于点A,B,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a40a655f1225fc50ff8c6247f5d97d.png)
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2020-11-05更新
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1343次组卷
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11卷引用:2020届江西省名师联盟高三入学调研考试数学(理)试题
2020届江西省名师联盟高三入学调研考试数学(理)试题南昌市2020届高三数学(理科)零模试题2020届广西柳州高级中学高三2月线上月考数学(理)试题(已下线)专题9.3 椭圆(精练)-2021年新高考数学一轮复习学与练河南省豫西名校2020-2021学年高二上学期第二次联考数学(文)试题浙江省衢州市常山县天马中学2020届高三上学期入学调研理科数学试题(已下线)重难点5 解析几何-2021年高考数学【热点·重点·难点】专练(山东专用)(已下线)黄金卷13-【赢在高考·黄金20卷】备战2021高考数学全真模拟卷(新高考专用)湖北省新高考联考协作体2020-2021学年高二下学期期中联考数学试题湖北省荆门市钟祥市实验中学2020-2021学年高二下学期5月阶段检测(1)数学试题河南省豫西名校2022-2023学年高二上学期第二次联考数学(文)试题
名校
解题方法
7 . 已知椭圆
的两焦点分别是
,
,点
在椭圆C上.
(1)求椭圆C的方程;
(2)设P是y轴上的一点,若椭圆C上存在两点M,N使得
,求以
为直径的圆面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45349f54f6abc8d331556557255f024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996dadd8544543637bd2d32a1f79579e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5524c3191a6f5f459884fc0574ae31.png)
(1)求椭圆C的方程;
(2)设P是y轴上的一点,若椭圆C上存在两点M,N使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dce8c8ad20d2d808779bf8a5ade7d46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da01a3abe1c9dc4e6283afa0dc1a0d39.png)
您最近一年使用:0次
名校
解题方法
8 . 如图,
为坐标原点,抛物线
的焦点是椭圆
的右焦点,
为椭圆
的右顶点,椭圆
的长轴
,离心率
.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585241444573184/2585610113138688/STEM/202a8c7b0c5c424bb95b0768fdcfd61f.png?resizew=265)
(1)求抛物线
和椭圆
的方程;
(2)过
点作直线
交
于
两点,射线
,
分别交
于
两点,记
和
的面积分别为
和
,问是否存在直线
,使得
?若存在,求出直线
的方程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f80080fac68745fe783b879cccb6140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2cfc8743c915f45bdccca70ab16648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c7316976a221c051a2c14df80b1347.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585241444573184/2585610113138688/STEM/202a8c7b0c5c424bb95b0768fdcfd61f.png?resizew=265)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e50a8cb65a2b304ed8ed5739ff90b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2020-11-04更新
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1006次组卷
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4卷引用:湖北省黄石市大冶市第一中学2019-2020学年高三理科复读班12月月考数学试题
湖北省黄石市大冶市第一中学2019-2020学年高三理科复读班12月月考数学试题(已下线)第九单元 解析几何 (A卷 基础过关检测)-2021年高考数学(理)一轮复习单元滚动双测卷江西省鹰潭市2021届高三高考二模数学(理)试题宁夏银川市第二中学2023-2024学年高二上学期期中考试数学试题
20-21高三上·江西南昌·阶段练习
名校
解题方法
9 . 已知A、B为椭圆
的左、右顶点,
,且离心率为
.
(1)求椭圆T的方程;
(2)若点
为直线
上任意一点,PA,PB交椭圆T于C,D两点,试问直线CD是否恒过定点,若过该定点;若不过定点,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004d3c8fff0581f4651ce992ef080de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57dfc9d1109fe41145cc892b5702d9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
(1)求椭圆T的方程;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bcc5ea186cd32c39b3d333b0f448c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
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20-21高二上·江西南昌·阶段练习
名校
解题方法
10 . 已知
是椭圆
上一点,A、B为长轴的两个端点,P为椭圆上异于A、B的任意一点,且直线PA与PB的斜率之积为
.动直线l与E相交于M,N两点.
![](https://img.xkw.com/dksih/QBM/2020/11/1/2583464062533632/2583559430438912/STEM/cea289e6dd02486da0c70c1f2b93b9c9.png?resizew=177)
(1)求E的方程;
(2)若
为弦MN的中点,求直线l的方程;
(3)若直线l过点
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af22555845a48f84b5aef2c7ee7ba0e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a200ca2c4af794f4d1c6a5443830b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602baac86c2b1668ecdfadc8a5948885.png)
![](https://img.xkw.com/dksih/QBM/2020/11/1/2583464062533632/2583559430438912/STEM/cea289e6dd02486da0c70c1f2b93b9c9.png?resizew=177)
(1)求E的方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e0e5d7369f8471a48ab990070b76c1.png)
(3)若直线l过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be14af6ba191f83c422bd408900882b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
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