已知数列
是公差不为0的等差数列,
是
和
的等比中项,
.
(1)求数列
的通项公式;
(2)求
,其中
;
(3)若
为正整数,记集合
的元素个数为
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e9d3644920a6654c41de61b7f3636d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacd6642b7144b65f7539dd9c1e1d7b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a48719a7eef7b8d451c1fccfef0090a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
更新时间:2023-12-18 20:05:53
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐1】已知数列
满足
,
,
.
(1)若
,
为递增数列,且
,
,
成等比数列,求
;
(2)若
,
,且
是递增数列,
是递减数列,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1723d7ac7dbc5b46fb2a32c3d614a189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e962057e0daa783fc1161ce3bb3c30d9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa9bf65189dfb57a61644a1cb27f361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a05feb0cc8f37effea9e72726ced58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3012337aa392709349731fb1eef5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535fd9605b90ac7f0fed6025be9f851f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa0a9335527f502ff782f35e44a87b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cf9d8a9c402670465fda4be57ca805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
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】已知等差数列
为递增数列,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef3d37853abde3139a81bc5421762b9.png)
(1)求
的通项公式;
(2)若数列
满足
,求
的前
项和的最大值、最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123b6afa3d8be7389913ec3cfe521510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef3d37853abde3139a81bc5421762b9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733969643c55ec0ddfddd781a6545778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a304ee61802c1cc89b60063332b52bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733969643c55ec0ddfddd781a6545778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
您最近一年使用:0次
【推荐1】已知正项数列
,其前
项和
满足
,且
是
和
的等比中项.
(1)求数列
的通项公式;
(2)符号
表示不超过实数
的最大整数,记
,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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1d4255c5d20945c148ea110ddc762b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)符号
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99111b4b38519cda17139c4b20c26160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75413c45697c95912ff93cb2fee07300.png)
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】已知数列
的前n项和为
,且
,
,
成等比数列.令
,是否存在正整数k,使得
是
与
的等比中项?若存在,求出所有满足条件的
和k,若不存在,请说明理由.
![](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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0cfe24f4698eaed9c426b24b4c9f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5403a3e238eda1844e54de1d851b6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e517900aba8aa2ad4e7e5c2e1eda91c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e5dfcc28321b563a8012ec2899c502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a689659a7c53f176b6c0ae7c4d25a4ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7276afab53cc00505217bc5f4bba8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.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】一个三角形数表按如下方式构成(如图:其中项数
):第一行是以4为首项,4为公差的等差数列,从第二行起,每一个数是其肩上两个数的和,例如:
;
为数表中第
行的第
个数.
…
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f95aaf633b692769df70ead32d09b.png)
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f3141c9a3543d080052159918cb7d7.png)
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f3b1c2ecda47422b4807489d3efabf.png)
……
(1)求第2行和第3行的通项公式
和
;
(2)证明:数表中除最后2行外每一行的数都依次成等差数列,并求
关于
的表达式;
(3)若
,
,试求一个等比数列
,使得
,且对于任意的
,均存在实数
,当
时,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5d0a73f50b3e4583f1c1b6d6bf0d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ff64e5f0e9058bf4358024dfeeaa23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ac67868774922bd551bd3a921919e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b433ad3f880bd4b12f8ec04b733235e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c96813e6e4d6c93cf171bc354eb0618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74af3720f59ce4f2d00a8e798d297c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f95aaf633b692769df70ead32d09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b52d0d1757ca7af6b4e75dcc8edc3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ccaeb381a7f4062c8a70541ed95b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f3141c9a3543d080052159918cb7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8d153808e059cced1f34cd37b82f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f3b1c2ecda47422b4807489d3efabf.png)
……
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66264366bbcab975022cffa711236f18.png)
(1)求第2行和第3行的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2295a385504d809c311ff4bb3f980bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619cef116e3f701de6707ec0b4dc728a.png)
(2)证明:数表中除最后2行外每一行的数都依次成等差数列,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf50e032946010d31c6288135eb4303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b640c28d4f3afbf94d07ec2e4d98b06.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b319dbcf9f7afc9a20ab83e312a5e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a92d4463e0a56109a13d60b640e0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52fc0fe9024f5a2abc30f67eeff626b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15bb6414a399db20565393afa52091a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46708de4fb77ee69d2a5453de0cefa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe9dbc75f393b682c8a90fe7277ab4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afaaa196735c0c02f05f97fda5534a4.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知数列{an}的中a1=1,a2=2,且满足
.
(1)求数列{an}的通项公式;
(2)设bn
,记数列{bn}的前n项和为Tn,若|Tn+1|
,求n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6335ef50d4ecff0c4513304e824be755.png)
(1)求数列{an}的通项公式;
(2)设bn
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e94ca73df93b0c39473088d6118422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97db096fc1a792ed1ae366d6241fa3b.png)
您最近一年使用:0次
【推荐1】若数列
中不超过 f (m)的项数恰为bm (m∈N * ),则称数列
是数列
的生成数列,称相应的函数 f (m)是
生成
的控制函数,设 f (m) = m2.
(1)若数列
单调递增,且所有项都是自然数,b1 =1,求a1;
(2)若数列
单调递增,且所有项都是自然数,a 1= b1 ,求a1 ;
(3)若an =2n (n =1,2,3),是否存在
生成
的控制函数g(n) = pn2 + qn + r(其中常数p,q,r∈Z),使得数列
也是数列
的生成数列?若存在,求出g(n);若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若an =2n (n =1,2,3),是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知
是公差为
的等差数列,
是公比为
的等比数列,
,正整数组
.
(1)若
,求
的值;
(2)若数组
中的三个数构成公差大于
的等差数列,且
,求
的最大值.
(3)若
,试写出满足条件的一个数组
和对应的通项公式
.(注:本小问不必写出解答过程)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7deddf7eb46a92c244bf95488bf03213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8470ee8b71d48161ead7ce2a74ee97e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415ea3b141bcae2fb5b01c93af58d8ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(2)若数组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf4d2c45adc5b65ff7798699b528c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e780f009583553e686b082e20a99d8b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
您最近一年使用:0次