名校
1 . 已知椭圆
:
的焦距为
,点
在椭圆
上,且
的最小值是
(
为坐标原点).
(1)求椭圆
的标准方程.
(2)已知动直线
与圆
:
相切,且与椭圆
交于
,
两点.是否存在实数
,使得
?若存在,求出
的值;若不存在,请说明理由.
![](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/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c388f1f7160d3397610633dfde015fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)已知动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10fc929c54ecd3215633e3af43de45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7df99fe6438442a9453fc0c57fb703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2020-01-30更新
|
1526次组卷
|
11卷引用:广西壮族自治区贵港市桂平市2019-2020学年高二上学期期末数学(文)试题
广西壮族自治区贵港市桂平市2019-2020学年高二上学期期末数学(文)试题广西壮族自治区贵港市桂平市2019-2020学年高二上学期期末数学(理)试题辽宁省辽阳市2019-2020学年高二上学期期末数学试题广东省2019-2020学年高二上学期期末数学试题河北省部分重点中学2019-2020学年高二上学期期末数学试题河南省新乡市2019-2020学年高二上学期期末数学(理科)试题广东省云浮市2019-2020学年高二上学期期末数学试题(已下线)2021年全国高考甲卷数学(理)试题变式题16-20题河南省焦作市温县第一高级中学2021-2022学年高二上学期11月月考理科数学试题(已下线)2021年全国高考甲卷数学(理)试题变式题16-20题广东省湛江市2020-2021学年高二上学期期末数学试题
名校
2 . 已知双曲线
:
的左、右焦点分别为
,
,点
在双曲线
上.若
为钝角三角形,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dad0c75ce33673ec4c425896e8619e4.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9df1061c3ba5151ba2f7359acaf356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfe1cad1ce47339827ac5047af4647d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-01-30更新
|
1318次组卷
|
7卷引用:广西壮族自治区贵港市桂平市2019-2020学年高二上学期期末数学(文)试题
3 . 如图,在直三棱柱
中,
,
,
,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/161b1d46-2c7a-429c-8cd3-b6ba5aef0a7c.png?resizew=222)
(1)证明:
平面
.
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e3555a1a081771a192f4d4de196e30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/161b1d46-2c7a-429c-8cd3-b6ba5aef0a7c.png?resizew=222)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02438f0423acd0ff2dfa5ffb6abf143f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
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2020-01-17更新
|
1082次组卷
|
7卷引用:广西壮族自治区来宾市2019-2020学年高二上学期期末数学(理)试题
4 . 已知点
分别是双曲线C:
的左、右焦点,O为坐标原点,点P在双曲线C的右支上,且满足
,
,则双曲线C的离心率的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9ebed0fde139e9699a8c46cc6620ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b63ba734fa1967f2827b652239b3298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4077e0e66100f9c291b786737db4e6d7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-01-15更新
|
1073次组卷
|
4卷引用:广西玉林、柳州市2019-2020学年高三上学期第二次模拟数学(理)试题
广西玉林、柳州市2019-2020学年高三上学期第二次模拟数学(理)试题2020届广西玉林、柳州市高三上学期第二次模拟考试数学(文)试题广西柳州市2020届高三第二次模拟考试理科数学试题(已下线)专题10 解析几何小题问题之一角度-备战2020年高考数学二轮痛点突破专项归纳与提高
名校
解题方法
5 . 设椭圆
:
(
)的离心率为
,椭圆
上一点
到左右两个焦点
、
的距离之和是4.
(1)求椭圆的方程;
(2)已知过
的直线与椭圆
交于
、
两点,且两点与左右顶点不重合,若
,求四边形
面积的最大值.
![](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/d5c7316976a221c051a2c14df80b1347.png)
![](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/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(1)求椭圆的方程;
(2)已知过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.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/6af0083b282b050aa660f368cd0cd473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1f306b4fca542ff2a9b3fccdddcdd5.png)
您最近一年使用:0次
2020-09-02更新
|
1445次组卷
|
23卷引用:【全国百强校】广西南宁市第三中学2017-2018学年高二下学期期末考试数学(文)试题
【全国百强校】广西南宁市第三中学2017-2018学年高二下学期期末考试数学(文)试题安徽省“皖南八校”2018届高三第三次(4月)联考数学(理)试题【全国校级联考】安徽省“皖南八校”2018届高三第三次(4月)联考数学(文)试题【全国百强校】四川省成都石室中学2018-2019学年高二10月月考数学(文)试题【全国百强校】贵州省遵义航天高级中学2019届高三上学期第三次月考数学(文)试题【全国百强校】贵州省遵义航天高级中学2019届高三上学期第三次月考数学(理)试题四川省眉山市仁寿第一中学校北校区2019-2020学年高二上学期期中考试数学试题黑龙江省大庆市让胡路区铁人中学2019-2020学年高二上学期期末数学(理)试题四川省宜宾市叙州区第一中学校2019-2020学年高二下学期第二次月考数学(文)试题四川省宜宾市叙州区第一中学校2019-2020学年高二下学期第二次月考数学(理)试题(已下线)2019届神州智达高三诊断性大联考(三)文科数学(预测卷Ⅰ)贵州省思南中学2019-2020学年高二5月摸底数学(理)试题黑龙江省大庆铁人中学2019-2020学年高二上学期期末考试数学(理)试题江西省赣州市石城县石城中学2019-2020学年高二下学期月考数学(理)试卷四川省南充市白塔中学2019-2020学年高二下学期第二次月考数学(理)试题2020届广东省肇庆市高三下学期高考质量监测数学(理)试题河南省部分重点中学2020届高考质量监测理科数学试题(已下线)考点46 直线与曲线的最值问题(练习)-2021年高考数学复习一轮复习笔记河北省邱县一中2020-2021学年高二上学期期末数学试题黑龙江省哈尔滨工业大学附属中学校2021-2022学年高二上学期期末考试数学(文)试题辽宁省沈阳市同泽高级中学2022-2023学年高二上学期12月月考数学试题云南省楚雄天人中学2022-2023学年高二下学期3月学习效果监测数学试题黑龙江省双鸭山市第三十一中学2024届高三上学期期中数学试题
单选题
|
适中(0.65)
|
名校
6 . 已知
是函数
图象上的一点,过点
作圆
的两条切线,切点分别为
,
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1c079afd1b058adc67a50f48f3d466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2affa2f968907083e02d6bf0338607.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/dc86613c8ad7fb3c3984870bf33cfe43.png)
A.![]() | B.![]() | C.0 | D.![]() |
您最近一年使用:0次
2020-01-07更新
|
707次组卷
|
4卷引用:广西柳州高级中学2019-2020学年高二寒假第二次线上测试数学(文)试题
广西柳州高级中学2019-2020学年高二寒假第二次线上测试数学(文)试题广西柳州高级中学2019-2020学年高二寒假第二次线上测试数学(理)试题云南省昆明市2019-2020学年高三下学期1月月考数学(理)试题(已下线)第36练 圆与方程-2021年高考数学(理)一轮复习小题必刷
解题方法
7 . 已知双曲线C:
(
)的左、右焦点为
,
,
为双曲线C上一点,且
,若线段
与双曲线C交于另一点A,则
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.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/1a5f4493abd2b69f83eae0362c509f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271fb7c2a4bb1d9655e992696ba05eb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bce5a69e50ba0fc9e19ba0b15a10a42.png)
您最近一年使用:0次
名校
解题方法
8 . 已知椭圆
的短轴两端点与左焦点围成的三角形面积为3,短轴两端点与长轴一端点围成的三角形面积为2,设椭圆
的左、右顶点分别为
是椭圆
上除
两点外一动点.
(1)求椭圆
的方程;
(2)过椭圆
的左焦点作平行于直线
(
是坐标原点)的直线
,
与曲线
交于
两点,点
关于原点
的对称点为
,求证:
成等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81687c0af83f550bcb802e2d82c76a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](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/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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c843d95cde2ef8dab7dd6fa9dffa86ce.png)
您最近一年使用:0次
9 . 已知
是椭圆
的左右顶点,
点为椭圆
上一点,点
关于
轴的对称点为
,且
.
(1)若椭圆
经过圆
的圆心,求椭圆
的方程;
(2)在(1)的条件下,若过点
的直线与椭圆
相交于不同的
两点,设
为椭圆
上一点,且满足
(
为坐标原点),当
时,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ca00309261a540934d9b3ed9ba05b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09efa89f6c8ccce51348b1446dd6486d.png)
(1)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bcfcc5fdcec676875e253087acc568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)在(1)的条件下,若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a0d4c22734cac795de1e5c5fbefa87.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfccfba0f6b1c0762a9cb37c3f6fff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c61d87afce5032c1ff9feefd6f0950a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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2020-03-20更新
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601次组卷
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4卷引用:2019届广西南宁市第二中学高三最后一模数学(理)试题
2019届广西南宁市第二中学高三最后一模数学(理)试题2019届广西南宁市第二中学高三最后一模数学(文)试题山西省实验中学2019-2020学年高三下学期3月开学摸底数学(文)试题(已下线)专题46 盘点圆锥曲线中的最值与范围问题——备战2022年高考数学二轮复习常考点专题突破
名校
10 . 下列命题正确的是________ (写出所有正确命题的编号)
①命题“若
,则
且
”的否定是“若
,则
且
”
②已知函数
的图象关于直线
对称,函数
为奇函数,则4是
一个周期.
③平面
,
,过
内一点
作
的垂线
,则
.
④在
中角
所对的边分别为
,若
,则
成等差数列.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9cdea1e995c59e5d3225acad8b4d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f600cfe06ce3b664321868968371bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bc2eeaca8a8ce4bcce2bff011a11bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43f0f4dccb727c6a655ff483f5f843d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec66b3436594131a07fee9e3fea6d9f.png)
②已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed2dd8a797d6da9c89e858aed9a7da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b707f5ee4fbb2e637c65fbc6d8ed03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b610e3c5b3d78a5730e7f3d736ac28.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d8bfe22f65d2ea1123905cd1815912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
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