已知
为等差数列,前n项和为
,
,
是首项为2的等比数列,且公比大于0,
,
,
.
(1)求
和
的通项公式;
(2)设
,
,
,求
;
(3)设
,其中
.求
的前2n项和
.
![](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/b5bc2b05dc79b18ecb4ac3f9b5c492d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff86be56090d576aad0c0945a6bd2bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4df9bda4a30d39bbc0ee4cd3ca13ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697cde83e568529d604454ba2b284016.png)
(1)求
![](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/ff58aa3ab29807fda113b73463e3e305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a87a4016b6b944a06732f8f75aae58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c704a284a72ee01aca0cfa2a45807d65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad52924df9291d5d191d18e09374ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
2022·天津和平·二模 查看更多[3]
更新时间:2022-06-01 16:51:03
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】若项数为
的数列
满足:
,且存在
,使得
,则称数列
具有性质P.
(1)①若
,写出所有具有性质P的数列
;
②若
,写出一个具有性质P的数列
;
(2)若
,数列
具有性质P,求
的最大项的最小值;
(3)已知数列
均具有性质P,且对任意
,当
时,都有
.记集合
,
,求
中元素个数的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2adcce353c3ced76645069760bdf8fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad107fc0e55e4b35b2b25b10f75f4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96b51d9b57fb8f9577f575261c08206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0265ce589cdf60588c9f86671a256992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc147c3c0863d22533a820cc469bfb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0818b44478f6d1d972aa5bf6dd4d3a0c.png)
(1)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a215612787e43d28bfebc840c3903b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1ddc5b7f288c044f394fd7055e2564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7aa41f0d2bd18825f741a3cc2adef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e645ae0b78ad4ca300e3889ca3f9bcce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e645ae0b78ad4ca300e3889ca3f9bcce.png)
(3)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719c07413b9a867b83f27f5eed752846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6119a01b55a29adabf43ddb2a5211e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b71af6590f0f369c164a054a8b63bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0504794eebd6814a3138e796666bca01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191929f42f9053e7355a1a9068ba072f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5975dbb4789b4b2d8f2f0eb3abb4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc47ee887b63cdc46fdb17dcb75f2f4.png)
您最近一年使用:0次
【推荐2】已知数列
满足
,
.
(1)求证:数列
是等差数列;
(2)记
,数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b752334e1a2744cad632074c456dee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3560843b6862c10f3cd3348bb12b113.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6631307e8ff61b215f447f2527c36e04.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6b17ef14f90e9af6d7f3f5100ceec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b69f65365b0845d14e64cad8f395f23.png)
您最近一年使用:0次
【推荐1】已知
是等差数列,
是公比为正数的等比数列,且
,
,
,
.
(1)求数列{
,
的通项公式;
(2)设
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2d56dd30fff703753578f20d797a97.png)
(ⅰ)求
;
(ⅱ)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/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55c6c2303f63c7ca868120cddf11643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6822ba1b661cddc1d744e23c4f9503f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355f362a3cdd8067cf5a70307f1af2d9.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/cc852a14e0404b9345742f42551eab09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2d56dd30fff703753578f20d797a97.png)
(ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba67146c41dba11b545dcb79e6ebfec.png)
您最近一年使用:0次
【推荐2】已知递增的等差数列
的首项
,且
、
、
成等比数列.
(1)求数列
的通项公式
;
(2)设数列
对任意
,都有
成立,求
的值.
(3)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451eedd2b6db5a8233816f51788f54a3.png)
,求证:数列
中的任意一项总可以表示成其他两项之积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d63ccd6e4872352f51e930610295ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137111042958a0554979dd7b4f85d589.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451eedd2b6db5a8233816f51788f54a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d307ec71820b6536453fbdb5069da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐1】已知等差数列
中,前
项和为
,
,
为等比数列且各项均为正数,
,且满足
,
.
(1)求
与
;
(2)设
,
,求
的前
项和
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d539f3a8eed10ffcc7aba172c9f8ee10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5252b6b2b8d408dcae481a53412aea.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c28a6d2b30be983b7a59e931074e66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ec1ead0d46959df22ced95fadb1d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
您最近一年使用:0次
【推荐2】设
是等差数列,
是各项均为正数的等比数列,
,
.
(1)求数列
与
的通项公式;
(2)数列
的前
项和分别为
;
(ⅰ)证明
;
(ⅱ)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/7d2321a15e35423a7e85ec684b2b8a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591c8f4062164ea52d6311e593022b97.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
(ⅰ)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b414c0b74e1d3831f72e545371b4e4.png)
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86117f13f9345c3e8b549ce050d79e12.png)
您最近一年使用:0次
【推荐1】已知数列{an},{bn}满足:an+bn=1,bn+1=
,且a1,b1是函数f(x)=16x2﹣16x+3的零点(a1<b1).
(1)求a1,b1,b2;
(2)设cn=
,求证:数列{cn}是等差数列,并求bn的通项公式;
(3)设Sn=a1a2+a2a3+a3a4+…+anan+1,不等式4aSn<bn恒成立时,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd070836d9e665d756bac44662f301c2.png)
(1)求a1,b1,b2;
(2)设cn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f35e6a1e89983476b57a0522edfa55.png)
(3)设Sn=a1a2+a2a3+a3a4+…+anan+1,不等式4aSn<bn恒成立时,求实数a的取值范围.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】数列
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21fef5b300a937f47e081d1d0c691a9.png)
(1)是否存在常数
,
,使得数列
是等比数列,若存在,求出
,
的值,若不存在,说明理由.
(2)设
,
,证明:当
时,
.
![](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/b21fef5b300a937f47e081d1d0c691a9.png)
(1)是否存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb1eb858eb17c2a9474784f8a1229d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672516b4ca5b692fecc28b136ed6485d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aeb6eb319ba57ca8e559e9bf216e83c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd1f8b60931aec2db1a096fe7996608.png)
您最近一年使用:0次