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解题方法
1 . 已知等差数列
的前n项和为
,且
.
(1)求
;
(2)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82eb9bf3e4f8118977e648803b3047c5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2024-03-21更新
|
1856次组卷
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4卷引用:四川省泸定中学2023-2024学年高二下学期4月期中考试数学试题
四川省泸定中学2023-2024学年高二下学期4月期中考试数学试题浙江省金丽衢十二校2024届高三下学期第二次联考数学试题广东省茂名市高州中学2023-2024学年高二下学期期中考试数学试题(已下线)浙江省金丽衢十二校2024届高三下学期第二次联考数学试题变式题11-15
2 . 已知数列
, 前
项和为
, 满足
.
(1)求数列
的通项公式;
(2)若
, 求数列
的前
项和
;
(3)对任意
, 使得
恒成立, 求实数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd9aa5ea928f401f91440cfa7870c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2fb45db89edf57c1e70d6c03640ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a5182ce72f39f4337f763180ade2db.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd9aa5ea928f401f91440cfa7870c83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6ea6f9af460251d14e20873c828f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cb8bf6cf23ae654b32a0348b15ba4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c302a108bd4c05d5b28de5e43a9092.png)
(3)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8c29b297e3ec337c3139c2a1ebed1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98943557018cf526d4373ca8103ba583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2022-07-10更新
|
761次组卷
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3卷引用:四川省甘孜藏族自治州2021-2022学年高一下学期期末数学试题