设
是各项为正数且公差为d
的等差数列
(1)证明:
依次成等比数列;
(2)是否存在
,使得
依次成等比数列,并说明理由;
(3)是否存在
及正整数
,使得
依次成等比数列,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60fc6993ed58c125ae54ec70c48c718.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572144820469760/1572144825868288/STEM/940552c963cf47d6bb21078c31971c6b.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da2dd8d2a73a50b19abd87bb39f48f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d1770855f8ff72ed7a4ae34684617f.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da2dd8d2a73a50b19abd87bb39f48f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1c4b8f96da2495ecc059119eb01e0f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572144820469760/1572144825868288/STEM/6a0b3dfefeca4ac5b557f6e1bab1b0c3.png)
2015·江苏·高考真题 查看更多[2]
更新时间:2016-12-03 14:39:44
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相似题推荐
解答题
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较难
(0.4)
【推荐1】已知等差数列
和等比数列
,其中
的公差不为0.设
是数列
的前
项和.若
是数列
的前3项,且
.
(1)求数列
和
的通项公式;
(2)若数列
为等差数列,求实数
;
(3)构造数列
若该数列前
项和
,求
的值.
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/2a18556fda4a825861f1170cdeb059ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2cb4485663835fc40a9cf82f491d5b3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5aa26579e2b5a06008f29096400287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)构造数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4319d962d318582d9db3c1b331c3c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c404311a00652a0a145319bcb3fa6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解题方法
【推荐2】已知数列
的前
项和为
,设数列
满足
.
(1)若数列
为等差数列,且
,求数列
的通项公式;
(2)若
,
,且数列
,
都是以
为公比的等比数列,求满足不等式
的所有正整数的
集合.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf28f523c304de843c4164f45800128.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2023f7d7b5bdc3c7e0fc2a00debb3081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf33b2a94eae16760d746f9b4b8dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8194a62bc60a9da9b5cf76f9dc0fa09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbdd854f5d2cd43dea1a3e2d64e32a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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名校
【推荐1】已知正项数列
的前
项和为
,满足
.
(Ⅰ)(i)求数列
的通项公式;
(ii)已知对于
,不等式
恒成立,求实数
的最小值;
(Ⅱ) 数列
的前
项和为
,满足
,是否存在非零实数
,使得数列
为等比数列? 并说明理由.
![](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/34bdec3c099dc428c7f7145779c51ee9.png)
(Ⅰ)(i)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(ii)已知对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428731b8309fee1682746d00ea2c5c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(Ⅱ) 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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f134d37141da9189892c80c142a1fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
【推荐2】已知数列
的前
项和为
,通项
满足
(
是常数,
且
).
(1)求数列
的通项公式;
(2)当
时,证明
;
(3)设函数
,
,是否存在正整数
,使
对
都成立?若存在,求出
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/b6a24198bd04c29321ae5dc5a28fe421.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/bb11ae0f68cc73db828e28ab1a6318e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71acdb04454c77e1e25ad4f336cccfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45482d31d1d7448c9f3922b4d2a55331.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6821eb83c0e78f23cbf124d364ced75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf4cea13f3c0a934a3be5a3d834774f.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9565fae086b9192bdd2a951ba9cb5744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e451e9734fca2921c510181244cd8318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f731b1c2119585343bdf9be8f71768e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
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【推荐1】【江苏省南通市2018届高三最后一卷 --- 备用题数学试题】已知等差数列
与等比数列
是非常数的实数列,设
.
(1)请举出一对数列
,使集合
中有三个元素;
(2)问集合
中最多有多少个元素?并证明你的结论;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2448cf72af76b810310e4cfb9818e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1247fd5efeba9065725d810f4fe733.png)
(1)请举出一对数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e4f0900cb00af2ce2bb0caa4014158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)问集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】已知数列
满足
,等比数列
为递增数列,且
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(1)求
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(2)令
,不等式
的解集为M,求所有
的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11913c4302df9c8bdd8b14a3ac576943.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec63be394254747190f843891363dba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ffc2041f879e0f1120270324d9d22a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c8b48c67e6fa68368ded6b763fa314.png)
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