名校
1 . 记
为等差数列
的前
项和,已知
,
.
(Ⅰ)求
的通项公式;
(Ⅱ)求
,并求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a283cf860a5ae70a1d4f30cb655d1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da79e928b881e1d26b885c3f5f3f75f2.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
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2018-11-18更新
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5卷引用:【全国县级联考】河北省邯郸市鸡泽、曲周、邱县、馆陶四县2017-2018学年高二下学期期末联考数学(理)试题