12-13高三上·浙江台州·阶段练习
1 . 已知函数
,数列
满足
,
.
(I)求证:数列
是等差数列;
(II)令
,
,若
对一切
成立,求最小正整数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19c6efd3d4d111e3cabd2a6e6eab959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75369db7afe5feec5c95e960136cbf3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(I)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
(II)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a878310553c3232ef1a51acd9191e599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f185918231d66422da56c885e36b1f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aeb047b40bcae97923e9b7b3aa431e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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11-12高一下·四川泸州·阶段练习
2 . 对于数列
,定义
为数列
的一阶差分数列,其中
,若
,且
.
(I)求证数列
为等差数列;
(Ⅱ)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f9d7c0929c0b60ceba9d0b9b64c180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a17b1ac739f5edd5b1536a72f8dad61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c23321b10c4c4699731311f05850c8.png)
(I)求证数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4ffc44c644045dd5bae48cbdd8923a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f4e22d752b108d2f82d074338533a9.png)
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3 . 设数列
的前n项和为
.
(I)求数列
的通项公式
;
(II)设数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32d0025c55f991c67a6ca66550bdb7b.png)
(I)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(II)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbf3344719bb7df6d1cea6f64d20d77.png)
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10-11高三·重庆·阶段练习
4 . 已知函数
,数列
,
满足条件:
.
(1)求证:数列
为等比数列;
(2)令
,
是数列
的前
项和,求使
成立的最小的
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc07843519c66f8988bc04f96bb2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842a7ab24159ed0927bbbd3ac2645282.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c79cc241cf4fa0beedefc2516df413.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a471d86ba7d8719e8c54c4566fd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307cd6a77de16aff5ab0defe75866ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811fd1213d56006017402f2acbea6894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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11-12高三·新疆乌鲁木齐·阶段练习
名校
5 . 已知正项数列
的前n项和满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2710bd50aef98ca7802dfe3778d0d806.png)
(1)求数列
的通项公式;
(2)设
是数列
的前n项的和,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3df934e2f21879573743c670c833497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2710bd50aef98ca7802dfe3778d0d806.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3df934e2f21879573743c670c833497.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac358315e0d8e3374de7c701bb0782b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f2e8d0f82168e0b436c70a59936f33c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f84a41c1b094b7ac17719f1957dd5f4.png)
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10-11高三·江西上饶·阶段练习
6 . 已知
是数列
的前n项和,并且
=1,对任意正整数n,
;设)
.(I)证明数列
是等比数列,并求
的通项公式;
(II)设
为
的前n项和,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3903653955c424d3f6135edc5b47e231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662fbf0ed9df0da17995bb9055ae9eaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b49e96784918dbe41ab69d2e9b64e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f8c977cd51bd891e713c9df5aac54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(II)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8a746a8eee59cd4a385d7ba2e5e01ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ecc8f592917d361d28d098e0ddc421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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7 . 设数列
的前
项和为
,且
对任意正整数
都成立,其中
为常数,且
.(1)求证:
是等比数列;
(2)设数列
的公比
,数列
满足:
,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/e3510b9d0042c017ab773f13f5219c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa204d6b5183969f6da37f369eb7293d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da10fd196174f5e4b3bace35bc81d9a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f208f1444b6b3bf3fa56bc663e0402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c89d56d96de1a90507295f18673eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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10-11高三下·湖南长沙·阶段练习
8 . 已知数列{an}的前n项和为
,
.
(1)求证:数列
是等比数列;
(2)设数列
的前n项和为Tn,
.试比较An与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf23882f7ada273a2d698602093812ac.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7cff8eadcec6863f526d0ad23e77fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413c26e7c9f2b1eec0c044261cba9c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ea5f671d3f15b3f304806f09630d90.png)
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10-11高三·河南新乡·阶段练习
9 . 设数列
的各项均为正数,若对任意的正整数
,都有
成等差数列,且
成等比数列.
(1)求证数列
是等差数列;
(2)如果
,求数列
的前n项和
.
![](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/e8f779f3dbe5676aae4747db3679ad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4bd97271ad3bf224f6cc3501ffd351.png)
(1)求证数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13cf9a0f6c7b32e02cf142f3d071f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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