已知正项数列{an}的前n项和为Sn,在①
,且
;②
;③
,
,这三个条件中任选一个,解答下列问题:
(1)证明数列
是等比数列,并求其通项公式;
(2)已知
当
且
时,
,数列
的前n项和为
,若
恒成立,求
的最小值.
注:若选择不同的条件分别解答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b2a09f14453f68329d983439a2ee3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ff45e02dbec34a87856ab005ac0d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e148ff4cabd6fb4d104d4611c670cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0908c8a773fa043864160f4e69e057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dafd98e5b223908b13013c3cacc0386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56cafe1878ccc6c84945fddc8609e40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafc28d435b6897b96b0daa8c0f9d850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
注:若选择不同的条件分别解答,则按第一个解答计分.
22-23高二下·新疆巴音郭楞·期中 查看更多[3]
新疆生产建设兵团第二师八一中学2022-2023学年高二下学期期中考试数学试题(已下线)模块三 专题1 劣构题专练【高二下人教B版】(已下线)模块三 专题3 高考新题型专练(专题1:劣构题专练)(北师大)(高二)
更新时间:2023-08-15 15:58:42
|
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】设数列
的前
项和为
,已知
,
,
成等差数列,且
,
.
(1)求数列
的通项公式;
(2)记
,
,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/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f3f7c43abb428c5d3d830f7db37fe05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f293f8a9800ff3a4b57912c070298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ed6c26f4d293efb36552bd4e3cfc17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】设Sn是等比数列{an}的前n项和,已知S2=4,a32=3a4.
(1)求an和Sn;
(2)设bn=
,求数列{bn}的前n项和Tn.
(1)求an和Sn;
(2)设bn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13088ed6239caef5bf4996418d4b6d9b.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐1】已知一非零向量列
满足:
,且
.
(1)求证:
是等比数列;
(2)求证:
的夹角
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a38e5d6578eccec4d2da37de80b885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f324759d5fa39cbb388b7e6d484b3e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a028fd67e59b7e4572a0c122dc62aca.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16c067abe5852f5fe0ebd2a46b4c552.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d83d12122c75e22539136c0717a0ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ffa8be5a02790c6161c56b8e90db64.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】已知数列
满足:
,且
.设
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(1)证明:数列
为等比数列,并求出
的通项公式;
(2)求数列
的前2n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/724459fad910e5e89af1cf4fdc566c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4188680e5320653753ad0340439cb77.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2234754e4b9e8a6639b95053cdf9cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知数列
满足
,若
为等比数列,且
.
(1)求
;
(2)设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3a926dda4f15cc423a210fa5be25a6.png)
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9403a47950705a3b62b2022039ff9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920664750e406ac9cd9c80acf70edb8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9926d286221e133e22b7ff39fea02fa6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e05269d65e45b24f008805827e52c22.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3a926dda4f15cc423a210fa5be25a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4a9181fb614e0deb43c4f0ad586f6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
【推荐2】已知数列
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,
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2438f2272d7b7ab51dbbe587025a553d.png)
(1)设
,求证:数列
是等差数列,并求
的通项公式;
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,不等式
恒成立时,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236fce2fe83bbc5d0a200ace4952fe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b049addc11b7c1cc622b745ebbd367.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2438f2272d7b7ab51dbbe587025a553d.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34fbb05ff16a2c473ea133f250613dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f347f0643c8013d25ca2d88e87a44a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3458e228949da4c92f5b8cd0173ba7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
【推荐1】已知数列
是首项为
的等差数列,
是各项均为正数的等比数列,且
,
.
(1)若数列
的公差为
,且
,在①
,②
,③
这三个条件中任选一个作为条件,判断此时数列
是否是递增数列,并说明理由;选______.
(2)若
,
,
成等比数列,数列
的前
项和为
,求数列
的通项公式.
(3)对于(2)中的
,若
对任意
,
恒成立,求满足条件的最小整数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58ec3fe298abc0674f7b0ec38465015.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d30e94689c4871fc03262535d4298d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d5ac5a3c1110d447cbc88a0a541792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d77662588656edf506d91a7d76d8350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb0a47a1d99efbb8faa03b8c599355c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(3)对于(2)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00dc5d8f1788f4511e0ca31d8260dfed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4613271f782a90ab580131d09d03d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知
是数列
的前
项和,且满足
(其中
为常数,
,
,且
,当
时
.
(1)求数列
的通项公式;
(2)若对于
,
,不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0810447137d392fe327ba9c1a9a7927d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2be31d987108fba76dbca933b92d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
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您最近一年使用:0次