已知等比数列
的公比为
是
的前
项和.
(1)若
,求
;
(2)若
有无最值?说明理由;
(3)设
,若首项
和
都是正整数,
满足不等式
,且对于任意正整数
有
成立,问:这样的数列
有几个?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab51b5f7f1bfdcbc078245de934414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3569927ec618ca54810d25fb00711b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf9264f3cb48b142d0a58e8eb51463d.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ad82582b7d8733b7d323b78a99605f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512d062f56d3d94b4e77c157642a83d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9533056643f05cc760d4a8d71d0811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
更新时间:2022-11-29 20:19:07
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相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】已知正数数列
的前
项和为
,满足
,
.
(1)求数列
的通项公式;
(2)设
,若
对任意
恒成立,求实数
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![](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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae58f8789259780fe2647068e012fb81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d136863d6beae5098ba2150334ddf235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】已知数列
的前
项和为
,满足
.
(1)求证:数列
是等比数列;
(2)求数列
的通项公式;
(3)若不等式
对任意的正整数
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a58f99d18f5dd045b2b443855df733.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/a74c7380dd04cb03ff0a9a82b2bf2c32.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cae04c15e7316277b96f2e9dd72d0f5.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a58f99d18f5dd045b2b443855df733.png)
(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92be26340b9c563598ff00c49a122960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
【推荐1】数列
满足:
,等比数列
的前
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,
.
(1)求数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183ae2a12f21350e45292420480b9628.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9239f2bcb1822f1785fc33852cdccda6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b882742adff739f2cc0df78bcca20c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】已知
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![](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/036fbda95652848a95584d3139526ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1288c53069e492296e859b65c9c58fb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a094fe9af3b3c3067f1089beec85dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e672c3d231081d12e44a4211e5ac60bf.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】已知等比数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb4a78dc1d3668cd4cdc2acafe3a9f7.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/ce2e47056c7eadecd6fcaf8f33945f4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】已知数列{an}的首项a1=5,前n项和为Sn,且Sn+1=2Sn+n+5,n∈N+.
(1)证明数列{an+1}是等比数列;
(2)求{an}的通项公式以及Sn.
(1)证明数列{an+1}是等比数列;
(2)求{an}的通项公式以及Sn.
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