1 . 已知等差数列
的前
项和为
,且
,
,
、
、
成等比数列,数列
满足
.
(1)求数列
、
的通项公式;
(2)设
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67bb9405b5d575f38602e4036ef6f87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7e3a77777303e543d250542d3b16e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589ed1f25e5b219f743eb67ac6f3a250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4497927e7bfb3dbee22bca3e00754393.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3ef69669dbe107e7accae7e4799715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b63bfaf83b751380ace1a13190da1b.png)
您最近一年使用:0次
20-21高三下·四川·阶段练习
名校
解题方法
2 . 设等差数列
的前
项和为
,已知
,且
是
与
的等比中项.
(1)求
的通项公式;
(2)若
.求证:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5032706dd285c22e149c675da465d9ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e7b23fd74e3cf89ac541cb7a5d88.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4112d8c74292d24e3451cb4868e31365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94abbd8806222d1c66440c602ccb6294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
您最近一年使用:0次
2021-02-28更新
|
1560次组卷
|
8卷引用:四川省2021届高三下学期诊断性测试数学(理)试题
(已下线)四川省2021届高三下学期诊断性测试数学(理)试题(已下线)四川省2021届高三下学期诊断性测试数学(文)试题(已下线)精做02 数列-备战2021年高考数学(文)大题精做(已下线)专题1.3 数列-常规型-2021年高考数学解答题挑战满分专项训练(新高考地区专用)黑龙江省哈尔滨市第九中学2022届高三第二次模拟考试数学(文)试题陕西省西安市长安区第一中学2022届高三下学期第五次教学质量检测理科数学试题陕西省西安市长安区第一中学2022届高三下学期第五次教学质量检测文科数学试题安徽省六安市舒城中学2021-2022学年高二下学期期中数学试题
解题方法
3 . 已知等差数列
的公差为
,等比数列
的公比为
,且
,
,
,
.
(1)求数列
,
的通项公式;
(2)令
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86249e312aa1413fae0e3aa986e96deb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631db881a87c19f40c82d474e5635fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce76fac5342eff7ea6534f1788408e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40c9b7ce7a2145770649e30cb222a43.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cd94760672596ab76e5962b372485a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eac8e06fcc400177c6cbaad57ff6ea.png)
您最近一年使用:0次
解题方法
4 . 在数列
中,
,
成等比数列,公比为
.
(Ⅰ)若
,求
;
(Ⅱ)若
成等差数列,公差为
,设
.
①求证:
为等差数列;
②若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7bf892c7ab5c80a981166069fb9622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8a5fbfc6b2845e8eb21301d5f9a4f5.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74aea0e5bf0bb6f53cd3a34983f0926e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9503b5953f1136ea897f8358bea9c16e.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4788aed6d0d396cffcb2d5aa69fc4574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8904e7018ec79c8b0efdcb3ba67cb7cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c05c0557cb0f74e02ca22b7c10c01d8.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab9a15f8bde29fa4a987a2d0a6e4064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b419ba91fa5722d3c820095076615881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63666ed9a7dfd5b578b43d513468acff.png)
您最近一年使用:0次
2021-01-30更新
|
788次组卷
|
5卷引用:浙江省杭州市2020-2021学年高三上学期期末数学试题
浙江省杭州市2020-2021学年高三上学期期末数学试题浙江省杭州市2020-2021学年高三上学期期末教学质量检测数学试题(已下线)【新东方】高中数学20210304-009(已下线)精做01 数列-备战2021年高考数学大题精做(新高考专用)广西钦州市第四中学2022-2023学年高二下学期3月月考数学试题
5 . 数列
的前n项之和为
,
,
(p为常数)
(1)当
时,求数列
的前n项之和;
(2)当
时,求证数列
是等比数列,并求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da6a7e488682c7b7eabfc99031bd193.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194b8ab194c7d299d5c3e0f09ec18384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8050391385b496e9c059201e4f12600a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acff98078cdd32804d8f1c4efbe2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2021-01-29更新
|
2589次组卷
|
6卷引用:贵州省贵阳市2021届高三上学期期末检测考试数学(理)试题
贵州省贵阳市2021届高三上学期期末检测考试数学(理)试题贵州省贵阳市普通中学2021届高三上学期期末监测考试数学(文)试题(已下线)专题24 数列(解答题)-2021年高考数学(理)二轮复习热点题型精选精练(已下线)专题22 数列(解答题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题23 数列(解答题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)(已下线)模块二 专题6《数列》单元检测篇 A基础卷 (人教A)
解题方法
6 . 数列
中,
,前n项和
满足
.
(1)证明:
为等差数列;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8323901a49cac29afd7d62864f088077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81988337afe6adbd3afddc8904e0e3fc.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8194a62bc60a9da9b5cf76f9dc0fa09.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21041b03840e637469cd6658e6e07ca8.png)
您最近一年使用:0次
7 . 已知
是各项均为正数的等比数列,若
,
的等比中项是
,且
,数列
的前n项和
满足
,且
.
(1)求
的通项公式;
(2)求证:
是等差数列,并求数列
的前n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7073684723741238b95b3b9d3b5301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0dd920cc4bc7d2a98dc808ca243a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c71f86842c42f85f5f1fbefc914405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0dd3fb6af23def773e1b0032a4f3c5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
名校
8 . 设数列
与
满足:
的各项均为正数,
.
(1)设
,若
是无穷等比数列,求数列
的通项公式;
(2)设
.求证:不存在递减的数列
,使得
是无穷等比数列;
(3)当
时,
为公差不为0的等差数列且其前
的和为0;若对任意满足条件
的数列
,其前
项的和
均不超过
,求正整数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191c5330aab76e1d5b6427f5ae241132.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ac6ad9c16b9a767940da9c2241413d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f65f1163dae0ce579536dbc538cef0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e021a223c85a5fe67380cf5d489ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2360f4c62f7f1173922e755529a00fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd790534835ca2b765f156824a961c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2360f4c62f7f1173922e755529a00fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de51986abddede978630e0db085330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08a01aed02ce1eaf1aaefaa0342b7ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2020-12-26更新
|
744次组卷
|
6卷引用:上海市杨浦区2021届高三上学期一模(期末)数学试题
上海市杨浦区2021届高三上学期一模(期末)数学试题(已下线)专题13 算法、推理与证明、复数(测)-2021年高考数学二轮复习讲练测(文理通用)(已下线)考向15 等比数列-备战2022年高考数学一轮复习考点微专题(上海专用)上海市行知中学2022届高三下学期期中数学试题上海市青浦高级中学2021-2022学年高二上学期期末数学试题(已下线)期末真题必刷压轴60题(22个考点专练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)
9 . 已知无穷数列
的首项为
,其前
项和为
,且
(
),其中
为常数且
.
(1)设
,求数列
的通项公式,并求
的值;
(2)设
,
,是否存在正整数
使得数列
中的项
成立?若存在,求出满足条件
的所有值;若不存在,请说明理由.
(3)求证:数列
中不同的两项之和仍为此数列中的某一项的充要条件为存在整数
且
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fade3b62af2d51880b021a075dcd551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7335c79ec0592fc36288f5135e86c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8212a513bceafbdb6e7e617a29079c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c1344592c925b273f2cb9b9e47ebbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6760775a38ed18ab8f346346e25de2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636f37adeddc68d0830ecd7d1c61ff8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98b2a1269d8cb234c7cc9d49e75196b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87a9ef1f87936695fb681df932efd10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54680219b440350ffc5f1f43b3b78e0.png)
您最近一年使用:0次
2020-12-23更新
|
388次组卷
|
4卷引用:上海市普陀区2021届高三上学期一模数学试题
上海市普陀区2021届高三上学期一模数学试题上海市奉贤中学2022届高三上学期开学考数学试题(已下线)重难点01 数列(基本通项求法)-2021年高考数学【热点·重点·难点】专练(上海专用)(已下线)考向14 等差数列-备战2022年高考数学一轮复习考点微专题(上海专用)
解题方法
10 . 对于数列
,若从第二项起的每一项均大于该项之前的所有项的和,则称
为
数列.
(1)若数列1,2,
,8是
数列,求实数
的取值范围;
(2)设数列
,
,
,
,
是首项为
、公差为
的等差数列,若该数列是
数列,求
的取值范围;
(3)设无穷数列
是首项为
、公比为
的等比数列,有穷数列
、
是从
中取出部分项按原来的顺序所组成的不同数列,其所有项和分别记为
、
,求证:当
且
时,数列
不是
数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若数列1,2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)设无穷数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9a724b59c890095baa5cb73e267c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9275bd8ce17fcc4a786510b008414ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80aeefc35c0251e558b90827b1382871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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