已知数列
,
,且
,
,求数列
的通项公式
![](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/c5e72c13f8f782c299903b31e577feae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
2023高三·全国·专题练习 查看更多[3]
更新时间:2022-08-20 20:39:58
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解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】已知数列
满足
,且
.求数列
的通项公式;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356c143f123c7f6e44232906fa0a5698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】已知在数列
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d46e527415401665298f12bf1a5ef52.png)
,求通项
.
![](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/3d46e527415401665298f12bf1a5ef52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58ec3fe298abc0674f7b0ec38465015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
解题方法
【推荐1】设M为部分正整数组成的集合,数列
的首项
,前n项和为
,已知对任意整数k属于M,当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5c5b0b6bdc1badcb4b67cf3d0935a5.png)
都成立.设
,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52eecd38954cd0ca3fb26328a39bb859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5c5b0b6bdc1badcb4b67cf3d0935a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5039c0247d45d99029b05cd54bac0512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0858a807d424f43398d3957ac3df22b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
【推荐2】已知数列
的通项公式为
(
),且
,
=-
.
(1)求
的通项公式;
(2)
是否为数列
中的项,若是,是第几项?若不是请说明理由.
(3)该数列是递增数列还是递减数列?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb6ce4cfba26e4f9d72b362ad937682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6024fd3d71da587d8df3a0c28e7840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780a1b00ea3a4fec3069509041c84511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5daa6581a5589f4e227acd6473760f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)该数列是递增数列还是递减数列?
您最近一年使用:0次