1 . 已知数列
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74911385943a97f1223fa77118000e7a.png)
.
(1)求证数列
是等比数列;
(2)求数列
的前
项和
;
(3)若对任意
,都有
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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74911385943a97f1223fa77118000e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fc82353331abee0828dee9b38c08f2.png)
(1)求证数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0496f142d8ae5acb06e83526eaa3ef87.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75b3c14179d05f8237f184dad3f87ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7703a7fb5662c11ed45755b2454fb039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
2 . 数列{an}的前n项和为Sn=2n+1﹣2,数列{bn}是首项为a1,公差为d(d≠0)的等差数列,且b1,b3,b11成等比数列.
(1)求数列{an}与{bn}的通项公式;
(2)设cn
,求数列{cn}的前n项和Tn.
(1)求数列{an}与{bn}的通项公式;
(2)设cn
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c16102f7771d5bd14fdd35f4f240ed.png)
您最近一年使用:0次
2020-03-17更新
|
294次组卷
|
3卷引用:四川省广安代市中学校2020-2021学年高一下学期第三次月考数学(理)试题
名校
3 . 已知数列
的前
项和
满足
,且
,数列
中,
,
,
.
(1)求数列
和
的通项公式;
(2)若
,求
的前
项的和
.
![](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/35267028888672dcd398d53ee8cd02bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b3ba67a27e63b867677b59d8240c08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000c750c292865b2807b386d9ea92a72.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2019-04-17更新
|
2889次组卷
|
6卷引用:四川省广安市武胜县武胜烈面中学校2020-2021学年高一下学期期中数学试题
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