![](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/8f7d13d855ea786a60db8c2b6f61e7fb.png)
![](https://img.xkw.com/dksih/QBM/2011/4/22/1570126179434496/1570126184644608/STEM/7d5a9b166188424583f31ffb0a1b0434.png?resizew=55)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
10-11高二下·四川雅安·期中 查看更多[2]
更新时间:2016-11-30 18:12:48
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【知识点】 二次函数法求等差数列前n项和的最值
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填空题-单空题
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名校
解题方法
【推荐1】在等差数列
中,
,则其前n项和
最小时,n的值为_____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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填空题-双空题
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较易
(0.85)
解题方法
【推荐2】数列
满足前
项和
,则数列
的通项公式为______ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ 时,
最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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