2020高三·江苏·专题练习
名校
解题方法
1 . 已知数列
与
的前n项和分别为An和Bn,且对任意
恒成立.
(1) 若
,求Bn;
(2) 若对任意
,都有
及
成立,求正实数b1的取值范围;
(3) 若
,是否存在两个互不相等的整数
,使
成等差数列?若存在,求出
的值;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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67a5b45ba7db02b037192d35ad92702.png)
(1) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c22d27751c744c7b35d68fd6a6d20ac.png)
(2) 若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deef5bc756c91fbc7a6ca5a6b5d744d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b49ac4c31e2c68662295d1a2bf722a3.png)
(3) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa178cd6391ca7c4e73cd25077de043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a5d71faee20e952a6ee9faa23f13f68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180d7a7eb7147b339eeb736322660195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b056a90a2751f04ba5fff3dc5c1d0674.png)
您最近一年使用:0次
名校
解题方法
2 . 定义:若无穷数列
满足
是公比为
的等比数列,则称数列
为“
数列”.设数列
中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447c6f91cc9ed460456899214b5b2d7e.png)
(1)若
,且数列
是“
数列”,求数列
的通项公式;
(2)设数列
的前
项和为
,且
,请判断数列
是否为“
数列”,并说明理由;
(3)若数列
是“
数列”,是否存在正整数
,使得
?若存在,请求出所有满足条件的正整数
;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/d82c65a855b1eed9c43e6829f6c3bffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23be005667829940b5be3513f337f18d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447c6f91cc9ed460456899214b5b2d7e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab7d59ce066c8f0b346719003f8e28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23be005667829940b5be3513f337f18d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ed4e99e27a105a3984f96e139ccedd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23be005667829940b5be3513f337f18d.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a631d6e9b5cc899fba66187a3ac9735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fed7b8bff9f713df2641e71d77b43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
您最近一年使用:0次
2020-02-27更新
|
420次组卷
|
2卷引用:2020届江苏省盐城市、南京市高三年级第一次模拟数学试题
3 . 已知数列
的前
项和为
,且满足
;数列
的前
项和为
,且满足
,
,
.
(1)求数列
、
的通项公式;
(2)是否存在正整数
,使得
恰为数列
中的一项?若存在,求所有满足要求的
;若不存在,说明理由.
![](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/c8370a173854471a3eb27637993a3d5d.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e96fafcc7b7f783d436f853449208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d365bc17eab673f7cbfba7e0aa0d9d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/792fff623df130e77ee1ee1060dbab34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
您最近一年使用:0次
2017-09-07更新
|
1095次组卷
|
5卷引用:《2018届优等生百日闯关系列》【江苏版】专题二 第六关 以新定义数列为背景的解答题
(已下线)《2018届优等生百日闯关系列》【江苏版】专题二 第六关 以新定义数列为背景的解答题2020届江苏省南通市如东县栟茶中学高三下学期5月模拟数学试题江苏省泰州中学2017-2018学年度高二上学期开学摸底考试数学试题江苏省泰州中学2017-2018学年高二上学期期初学情检测(小高考模拟)数学试题湖北省部分名校2023届高三二模数学试题
4 . 若正项数列
的首项为
,且当数列
是公比为
的等比数列时,则称数列
为“
数列”.
(1)已知数列
的通项公式为
,证明:数列
为“
数列”;
(2)若数列
为“
数列”,且对任意
,
、
、
成等差数列,公差为
.
①求
与
间的关系;
②若数列
为递增数列,求
的取值范围.
![](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/edcf33b2a94eae16760d746f9b4b8dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da6f7c4470c8478d7c7cf1911fe375f.png)
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34aab45f65ccdbd6d6cfdeb9bc3fabbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da6f7c4470c8478d7c7cf1911fe375f.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da6f7c4470c8478d7c7cf1911fe375f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a36c2f125bc8b3be4ffd62e8e41e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4df659fce077331a5e73501cb66c5ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb5451cbba3fd47ed9f9e9c97ac81be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbda318470f59590808d0c011c84ac.png)
②若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
您最近一年使用:0次
解题方法
5 . 若数列
,
满足
,则称数列
是数列
的“偏差数列”.
(1)若常数列
是数列
的“偏差数列”,试判断数列
是否一定为等差数列,并说明理由;
(2)若无穷数列
是各项均为正整数的等比数列,且
,数列
为数列
的“偏差数列”,数列
为递减数列,求数列
的通项公式;
(3)设
,数列
为数列
的“偏差数列”,
、
且
,若
,(
)对任意的
恒成立,求
的最小值.
![](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/6f1ba05858ddb902eda106c0361b2e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若常数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若无穷数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea11bd18577ee314988bc70b0caf23f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3b8eff9000900bf5b26afd3489cb3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4523dca11f510fac3a51d406fd78448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](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/af4a2ab6d0957e52a1242e6d899be539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1512b9a0d9d79f8b71ced14eacd85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658f7e866c7ae90f7c0d1444000d7a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa72c594ebe33496fa7b9edf1db5c7e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5dd1562138ab60802c33a17a8d7867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db3536b4f6b80285e2044bec5ab20bd.png)
您最近一年使用:0次
解题方法
6 . 已知数列
,
满足:对于任意正整数n,当n≥2时,
.
(1)若
,求
的值;
(2)若
,
,且数列
的各项均为正数.
① 求数列
的通项公式;
② 是否存在
,且
,使得
为数列
中的项?若存在,求出所有满足条件的
的值;若不存在,请说明理由.
![](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/2168c26da0aa0055a6d113e6ecf3e060.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a69c1aa2f076433b0aa43eb28642b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ffcdd61d37eda8996dd818cb65b86b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f7d7f58b45651b3d95b71fcb38d232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
① 求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
② 是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e36bff57bcfa86432b340e25e51d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e175e764228606c5a7314cd41fb15711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
7 . 已知数列
,
满足
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95f14841087e74e43889d23cdd162e7.png)
__________ .
![](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/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b049addc11b7c1cc622b745ebbd367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0076b2044a40c9576c1a90deb9d4a382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95f14841087e74e43889d23cdd162e7.png)
您最近一年使用:0次
2017-11-28更新
|
756次组卷
|
2卷引用:江苏省常熟市2018届高三上学期期中考试数学试题
8 . 已知数列
满足:对于任意
且
时,
,
.
(1)若
,求证:
为等比数列;
(2)若
.
① 求数列
的通项公式;
② 是否存在
,使得
为数列
中的项?若存在,求出所有满足条件的
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec664c38448edaaf4d7edb034bb341e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47833bc56306d9afc44204e5c2d5619d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2a0d3b49280f21c404fafe255e39da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccca645cf060a0177414c787ce59a7c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c9c39efc53af82fec6d9cf76db5afa.png)
① 求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
② 是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d0919893474b813ff79a073cd69cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9cb52f135fa6cc22c0b73f9d691e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次