11-12高一下·福建漳州·期中
名校
1 . 已知等差数列
中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d03cc7c9f4351d23ba3ab841b16069.png)
(1)求数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)当n取何值时,数列
的前
项和
取得最值 ,并求出最值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d03cc7c9f4351d23ba3ab841b16069.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)当n取何值时,数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
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2016-12-01更新
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10-11高一下·云南昆明·期末
名校
2 . 已知等差数列
中,
,公差
,则使前
项和
取最大的正整数
是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f3fa9dbfc94ec0052a4c9f559ce1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8bbb4a09e0ac86bbae46222a90841.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/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.不存在 |
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2016-12-01更新
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2011高二上·山东潍坊·学业考试
3 . 在等差数列
中,公差
,
为
的前
项和,且
,当
达到最大时,
为何值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8bbb4a09e0ac86bbae46222a90841.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17c11618275f4619e8b150722a23ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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11-12高二上·吉林·期中
4 . 递减等差数列
的前
项和
满足
,则欲使
最大,则
=_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/6cc1ec50ff0c75ebb3d136144ddc8d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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10-11高一下·内蒙古赤峰·期中
名校
5 . 已知等差数列{an}的前n项的和记为Sn.如果
,
.
(1)求数列{an}的通项公式;
(2)求Sn的最小值及其相应的n的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4856b98baa33a79c4c9816eba36fb844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a442209925cb703cf0185c3bd8e0197b.png)
(1)求数列{an}的通项公式;
(2)求Sn的最小值及其相应的n的值;
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2016-11-30更新
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10-11高二下·四川雅安·期中
名校
6 .
是等差数列
的前n项和,若
,则当
时,
取最大值.
![](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)
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11-12高二上·辽宁锦州·期末
7 . 已知等数差数列
中,
是它的前
项和,若
且
,求当
最大时
的值.
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb15e818ed3399e6acfb390f4805b743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f0853863ab2c68e6393b1049aa7fe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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11-12高二上·安徽·期末
8 . 数列
的通项公式为
,
达到最小时,n等于_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709bd1e26941edd5b56438a1325a3fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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10-11高二上·福建福州·期中
名校
9 . 在等差数列{
}中,
=18,前5项的和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bccd6b7cf0721f738ea046cd6399ca7.png)
(1)求数列{
}的通项公式; (2)求数列{
}的前
项和的最小值,并指出何时最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bccd6b7cf0721f738ea046cd6399ca7.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://img.xkw.com/dksih/QBM/2010/11/26/1569918639202304/1569918644436992/STEM/3fbb28ca241348ac88a69e65b4b08403.png?resizew=13)
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2016-11-30更新
|
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9-10高一下·广东湛江·期末
10 . 设等差数列
第10项为24,第25项为-21,.
(1)求这个数列的通项公式;
(2)设
为其前
项和,求使
取最大值时的
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)求这个数列的通项公式;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/b6a24198bd04c29321ae5dc5a28fe421.png)
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