已知数列
的前
项和为
,
,
,
.
(1)求数列
的通项公式;
(2)设
,
的前
项和为
,若对任意的正整数
,不等式
恒成立,求实数
的取值范围.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2242a8c66c99dcb9404117a9acea46c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00017a193e3b9ecdd08ed8a692213aa.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a503c4efc623c2cf08888de1c97f25f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
2023·云南·模拟预测 查看更多[3]
更新时间:2023-06-01 20:10:25
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知等差数列
中,
.
(1)求数列
的通项
;
(2)设
,求数列
的前
项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894aaec56149f880c7cf2bbc0f358d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba93eaf3629f59b8eff0cb246590ec0.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894aaec56149f880c7cf2bbc0f358d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64bc7bf99ccc7e4005bb9b635ffc9021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐2】已知等差数列
的前
项和为
,且
,
数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56838e750705581b554587d7a706490.png)
设
.
(1)求数列
的通项公式;
(2)证明:对任意的
,都有
;
(3)求
的值.
![](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/3aa54a479e4178d698818f69d859fe13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507cb1daa83a997ffd19b4dfa1255217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56838e750705581b554587d7a706490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de6ad2d5c1ccc43a599bb1fbd6313b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88da1ea168f6a38043c981b82864cc35.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)证明:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07bc71400c2f8100bb271dea5fd35c3b.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b74d6027c4e815620abb63c46c8381e.png)
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解答题-问答题
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解题方法
【推荐1】已知数列{an}的前n项和为Sn,且Sn=n(n+2)(n∈N*).
(1)求数列{an}的通项公式;
(2)设bn
,求数列{bn}的前n项和Tn.
(1)求数列{an}的通项公式;
(2)设bn
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49aaf05470b864320ee2692b96b5ae4.png)
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】已知数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)若数列
满足
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/4695f7d09c11f1ededdd30ae3ae01b9b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b3c770b67828af48286b6e5867d6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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【推荐1】
,
是方程![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/41ddcea539564b41a18b5d4598fb2d0b.png)
的两根, 数列
是公差为正的等差数列,数列
的前
项和为
,且![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/5c16accfb76a4c78932bde1d962c1f0a.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/603e6cb464b14892bdb6d566a39bfd20.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/c28572222f4247ea93777fed123c2ac8.png)
.
(1)求数列
,
的通项公式;
(2)记
=![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/8d4854fe1af245ab9896830a490ca3da.png)
,求数列
的前
项和
.
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/168cc16ceb9f4cd69332dd4f9a920f3c.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/97cdea0962534c938ea62313622404c2.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/41ddcea539564b41a18b5d4598fb2d0b.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/3b9b10408c34464eb39b8e2a454be0de.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/5f639cc0acc84f84a435446b3b655db2.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/2010e1fbb7364aa7ac6e1be91d33360c.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/d20b91b126a441c19c0b4b109a064275.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/5c16accfb76a4c78932bde1d962c1f0a.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/5c16accfb76a4c78932bde1d962c1f0a.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/603e6cb464b14892bdb6d566a39bfd20.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/c28572222f4247ea93777fed123c2ac8.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/52362ab1dded484f8d11986e91a89a10.png)
(1)求数列
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/5f639cc0acc84f84a435446b3b655db2.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/2010e1fbb7364aa7ac6e1be91d33360c.png)
(2)记
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/7f940d54dad64787b8165ba9aa104e11.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/8d4854fe1af245ab9896830a490ca3da.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/c28572222f4247ea93777fed123c2ac8.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/27f4916c4be94e3e8db5d02458a76de7.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/d20b91b126a441c19c0b4b109a064275.png)
![](https://img.xkw.com/dksih/QBM/2013/5/27/1571230160248832/1571230165917696/STEM/6e1db1ba662d4d4f815b771dbcdc864d.png)
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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2】已知
为数列
的前
项和,且有
,
(
).
(1)求数列
的通项公式;
(2)若数列
满足
,求其前
项和为
.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7690dd0768d6744c69094e80aea9808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40ba6916865c22cdde2221d9bef9da6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b3ee22d885ad2bbda69c9b42b80ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7a01b4b9a2c83e5f0d7aeea3ee2f88.png)
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(0.65)
解题方法
【推荐1】已知数列{
}满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcda24dce90a9c3175ebdbceb3f334a.png)
(
,
,
).
(1)求数列{
}的通项公式
;
(2)若对每一个正整数
,若将
,
,
按从小到大的顺序排列后,此三项均能构成等差数列,且公差为
.
①求
的值及对应的数列
.
②记
为数列
的前
项和,问是否存在
,使得
对任意正整数
恒成立?若存在,求出
的最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318e7c16b4a4e9a257598e12caef2fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcda24dce90a9c3175ebdbceb3f334a.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fbdf49cd00af1ff87259836ddd9f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe8c59f5ef33f4551c2bfcc0bf5b23e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若对每一个正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217b927efe12a98e1082ecd7f035b921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20751aac59514228826454c21803e504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db763aa448df7a754e24bea79514678d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8904e7018ec79c8b0efdcb3ba67cb7cb.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b14e08a352c3c380ced258420ef97d.png)
②记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0a9523f2084cf17b8656c11ab1d95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b14e08a352c3c380ced258420ef97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d396f5f9f37d73cc87df9406e2e5e06c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-证明题
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解题方法
【推荐2】已知首项为1公差不为零的等差数列
,
为
,
的等比中项,数列
的前
项和为
,且
,
.
(Ⅰ)求数列
,
的通项公式;
(I)若
,数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3f946894e21775f9d2b4219ed627eb.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/16104d9d883e80d5000ef7b2a59dae8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(I)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2594bd24a59848262172eb3d743a80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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/2511c49bf3a80792219835b840dee330.png)
您最近一年使用:0次