解题方法
1 . 已知
和
均为等差数列,
,
,
,记
,
,…,
(n=1,2,3,…),其中
,
,
,
表示
,
,
,
这
个数中最大的数.
(1)计算
,
,
,猜想数列
的通项公式并证明;
(2)设数列
的前n项和为
,若
对任意
恒成立,求偶数m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8f08a2e3a40cc2fb680104133df13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4602c763b6896b76ec80c73cbb6b0126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075255ba5f02900e250ff61f7491dc5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f40db3e0b43d3e92b807827c1612f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d294754430977273da149a8ea6c345da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a202bda83f2640744337ee18ad45dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a47d46ba3cddd9ba7e79b8d0369592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637f94c79ddadc15f305bed8adc45733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76f79be89b8c6227b68eded6b675546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db84454f051d418a4904fa423ab8b304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0909e967ae83425ea3b319bc25b3ad34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd32114b6a51df290934bce11b6e255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
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3卷引用:天津市津衡高级中学2022届高三下学期4月月考数学试题
2 . 已知数列
是等比数列,数列
满足对
,且
.
(1)求数列
和
通项公式;
(2)若数列
的前
项和为
,求证:
;
(3)对任意的正整数
,设数列
求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378be6d60e420d6c4ede9fc4b8108dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4694543de081b3dc193ec0ec1707258d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfccc89f83f2af31049391057c8f525d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c857b86f18a54fcef542574deeca4a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ab3b747e31fd1f95af4961b7b6a8bd.png)
(3)对任意的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadf9ce5024edb1f2d765599deec2128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f64fbbdf5e886b091e597c7c18b4ce.png)
您最近一年使用:0次
名校
解题方法
3 . 设数列
的前
项和为
,
,数列
满足
,
.
(1)求数列
的通项公式;
(2)求数列
的通项公式;
(3)设数列
,求数列
的前
项和
.
![](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/83fd67e206753eff52406291c19daa38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c1e5af7119d992d5926829188de27f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fb2435688b8751c160cb08d8a3bffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
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4卷引用:天津市第四十七中学2022届高三下学期3月线上练习二数学试题
天津市第四十七中学2022届高三下学期3月线上练习二数学试题山西省太原市2022届高三第一次模拟数学(理)试题(已下线)押全国卷(理科)第17题 解三角形与数列-备战2022年高考数学(理)临考题号押题(全国卷)江西省南昌市第二中学2022-2023学年高二下学期3月月考数学试题
名校
解题方法
4 . 设数列
的前
项和为
,已知首项
,
,数列
中,
,
,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544e07bf2193d48167da7d3f022e5760.png)
(1)求数列
和
通项公式;
(2)若
,求证:
![](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/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2098fb2a1bdf3a52ec61a4f836a48c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46460977b798f237b452f363b9d523e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544e07bf2193d48167da7d3f022e5760.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e1004fb267d742b7b00442d4adbc70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8db98f5d08158167824761959dc9b81.png)
您最近一年使用:0次
5 . 已知公差不为零的等差数列
的前
项和为
,
,
,
,
成等比数列,数列
满足
,
.
(1)求数列
和
通项公式;
(2)求
的值;
(3)证明
![](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/36183db0759eec0e108274d229fcd00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4462324656c6ba02a63c24f764da0a9.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b2cb71f16e36b7fc7860d1a775cb52.png)
(3)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb03e2661d7d77c1ba0bf9bc887c1e0.png)
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3卷引用:天津市河西区2021-2022学年高三上学期期末数学试题
天津市河西区2021-2022学年高三上学期期末数学试题河北省部分重点中学2022届高三下学期期中数学试题(已下线)押全国卷(理科)第17题 解三角形与数列-备战2022年高考数学(理)临考题号押题(全国卷)
6 . 已知公比大于1的等比数列
的前6项和为126,且
,
,
成等差数列.
(1)求数列
的通项公式;
(2)若
),求数列
的前n项和
;
(3)若数列
满足
(
且
),且
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b32aee86109b777671cd62868db3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6fae41755ecb64ac239a5a2d767354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01523eba7fea940e90e78ebec6eb4e87.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b19365e4cd7d33f2b3eb76a2537417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef0edb12b05e8f795ea6e6362fe05dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1ee88beaddafb0d0a185c3a8e0dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c164aa132cdc4269c9d39aa113a93828.png)
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2卷引用:天津市河北区2021-2022学年高三上学期期末数学试题
7 . 已知在各项均不相等的等差数列
中,
,且
、
、
成等比数列,数列
中,
,
,
.
(1)求
的通项公式及其前
项和
;
(2)求证:
是等比数列,并求
的通项公式;
(3)设
求数列
的前
项的和
.
![](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/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbcab0da135650f774f78156d1f61ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9aa8112c66efc096e04eb7a9b684af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
(1)求
![](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)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0791fc0d57d2e1b240c01d4c4901dadc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9441abef0ca046aafd4ce2c91b93be1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
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2022-03-04更新
|
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5卷引用:天津市滨海新区七所重点学校2022届高三下学期毕业班联考数学试题
天津市滨海新区七所重点学校2022届高三下学期毕业班联考数学试题天津市第三中学2022届高三下学期三模数学试题(已下线)6.4 求和方法(精练)(已下线)专题05 数列 第二讲 数列的求和(解密讲义)(已下线)高二数学开学摸底考01(江苏专用)-2023-2024学年高中下学期开学摸底考试卷
名校
解题方法
8 . 已知公差不为零的等差数列
中,
,且
,
,
成等比数列,
(1)求数列
的通项公式;
(2)数列
满足
,数列
的前
项和为
,若不等式
对一切
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](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/daf464629fa321a6ff7401ab79f07083.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285f98db16b34ddcb0204c8e38578639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ede4b754c6562f640fcb902762211d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2022-02-19更新
|
1196次组卷
|
4卷引用:天津市红桥区2021-2022学年高三上学期期末数学试题
天津市红桥区2021-2022学年高三上学期期末数学试题山东省聊城市第二中学2021-2022学年高三下学期第一次测评数学试题(已下线)思想01 函数与方程思想(讲)--第三篇 思想方法篇-《2022年高考数学二轮复习讲练测(浙江专用)》(已下线)思想02 分类与整合思想(练)--第三篇 思想方法篇-《2022年高考数学二轮复习讲练测(浙江专用)》
9 . 已知等比数列
的各项均为正数,
,
,
成等差数列,且满足
,等差数列数列
的前n项和
,
,
(1)求数列
和
的通项公式;
(2)设
,求数列
的前2n项和.
(3)设
,
,
的前n项和
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8afb5276cccd088ed7cada99858bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4774fd0e7fbe540dd8f52c67ac6a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f136cae0bc90e8f766e2829d26158d57.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/5fdc528cc909a2fa1395c52a68be68a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa45ba57a920ce722a0e17307601b92.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/64908d9a973390ea32ee49812ca9e884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610be94af2348ae802a0b2c23b3b6183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d76c3eb0a07a827877d7a4dc306211.png)
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2022-06-27更新
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1918次组卷
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6卷引用:天津市第四十三中学2022-2023学年高三上学期期末数学试题
天津市第四十三中学2022-2023学年高三上学期期末数学试题天津市南仓中学2022-2023学年高三上学期期末数学试题天津市静海区四校2021-2022学年高三上学期12月阶段性检测数学试题(已下线)专题24 等差数列及其前n项和-3天津市武清区黄花店中学2022-2023学年高三下学期开学测试数学试题(已下线)山东省济南市2022-2023学年高三上学期期中数学试题变式题15-18
10 . 已知
为等差数列,
为等比数列,
,
,
.
(1)求
和
的通项公式;
(2)记
的前n项和为
,求
的最小值;
(3)设
求数列
的前2n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4841a373b6c18a212534b2ea98516370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ff8ce3e59c069490084ffc200cfda9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](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/b7992784969302972dea1cd70968c067.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a62733edb931dc0727fce74f669634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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