1 . 等比数列{an}中各项均为正数,Sn是其前n项和,且满足2S3=8a1+3a2,a4=16,则S4=
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2 . 在公比为q的等比数列{an}中,已知a1=16,且a1,a2+2,a3成等差数列.
(Ⅰ)求q,an;
(Ⅱ)若q<1,求满足a1-a2+a3-…+(-1)2n-1a2n>10的最小的正整数n的值.
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3 . 在数列
中,
,数列
是首项为9,公比为3的等比数列.
(Ⅰ)求
,
;
(Ⅱ)求数列
的前
项和
.
![](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/82be9cc250114ce45db11d4d22138491.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(Ⅱ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbac5fe26ed7f7ed4d0efa8bf732e98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2016-12-04更新
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362次组卷
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4卷引用:5-5 数列的综合应用(高效训练)-2019版导学教程一轮复习数学(人教版)
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4 . 已知数列
各项均为正数,
,
,且
对任意
恒成立,记
的前
项和为
.
(1)若
,求
的值;
(2)证明:对任意正实数
,
成等比数列;
(3)是否存在正实数
,使得数列
为等比数列.若存在,求出此时
和
的表达式;若不存在,说明理由.
![](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/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2da6815dfdea93934851b6a476f85a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced4e381e8c3336848b8c436dbc584f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
(2)证明:对任意正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cf4b6861506cdd6691b868cfc1889b.png)
(3)是否存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84747f1c1a82542acb650c949a8c2fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2017-11-28更新
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304次组卷
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4卷引用:2018年高考二轮复习测试专项【苏教版】专题五 数列
(已下线)2018年高考二轮复习测试专项【苏教版】专题五 数列(已下线)《2018届优等生百日闯关系列》【江苏版】专题二 第五关 以子数列或生成数列为背景的解答题江苏省常熟市2018届高三上学期期中考试数学试题江苏省苏州市2018届高三上学期期中调研数学试题
5 . 已知公差为
的等差数列
及公比为
的等比数列
满足
,则
的取值范围是______ .
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de34425d0af2f21b1fbf2b474952ce80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f04dc034b37dcd72288ddcbe9e9544b.png)
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2016-12-04更新
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386次组卷
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3卷引用:2018年高考二轮复习测试专项【苏教版】专题五 数列
名校
6 . 公比为
的等比数列
,若删去其中的某一项后,剩余的三项(不改变原有顺序)成等差数列,则所有满足条件的
的取值的代数和为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fde3541708c770e48a06c28f9a3434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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7 . 已知数列
,其前
项和为
.
(1)若对任意的
,
,
,
组成公差为4的等差数列,且
,求
;
(2)若数列
是公比为
(
)的等比数列,
为常数,
求证:数列
为等比数列的充要条件为
.
![](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)
(1)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e20d6d31d98713228480757c4efc8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3536ce3ce7caf7e7151a124425ef44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07f7a46323e7630dd8cd5cffcb11a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9a0d7150fb24be3e28ef7f0e18be93.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3634fc91aa788873aabc4f7b1da2e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354efd9145bb3bd889cf0eaadbcc55f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd23ceec6e529e6d09cf7fab4e5ab41.png)
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2017-12-08更新
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3卷引用:黄金30题系列 高三年级数学(文) 大题好拿分【提升版】
(已下线)黄金30题系列 高三年级数学(文) 大题好拿分【提升版】江苏省南京市多校2017-2018学年高三上学期第一次段考数学(理)试卷江苏省南京市多校2017-2018学年高三上学期第一次段考数学(文)试题