已知数列{an}的前n项和Sn满足
+1(n≥2,n∈N),且a1=1.
(1)求数列{an}的通项公式an;
(2)记bn=
,Tn为{bn}的前n项和,求使Tn≥
成立的n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55b916a37e53bee9348af051cc477a0.png)
(1)求数列{an}的通项公式an;
(2)记bn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa172af12f6033165c5820b31566b4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c350e626893ba12c028b6c8bc4ea8d3.png)
2020高三·全国·专题练习 查看更多[2]
更新时间:2020-10-27 16:54:57
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解题方法
【推荐1】已知正项数列
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,且
(
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(2)若
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(1)证明数列
![](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)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788c71b5ece324f2506fc5f856752a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
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【推荐2】点
(
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}满足
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(1)证明:数列{
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(2)数列{
}满足
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(1)证明:数列{
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(2)数列{
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】已知数列
的前
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,当
时,
.
(1)求数列
的通项公式;
(2)设
,设
,求数列
的前
项和为
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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(1)求数列
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(2)设
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解答题-问答题
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适中
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名校
【推荐2】已知正项数列
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(如果选择多个条件分别解答,按第一个解答计分.)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】已知正项数列
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