名校
1 . 设等差数列
的前
项和为
,
且
,则当
取最小值时,
的值为( )
![](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/179513ce80436471efbe1d9b31735f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e36d63d67097b19f6da580622485aa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
11-12高三上·黑龙江·期中
名校
2 . 等差数列
前
项和为
,满足
,则下列结论中正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07404ab51f404f9411f79bd4f1fde654.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/f008e120f80546d0e141dbbbfe932b45.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2016-12-01更新
|
1019次组卷
|
3卷引用:2012届黑龙江省哈师大附中高三上学期期中理科数学试卷
(已下线)2012届黑龙江省哈师大附中高三上学期期中理科数学试卷安徽省六安市第一中学2018-2019学年高一下学期期末数学试题安徽省六安市第一中学2018-2019学年高一下学期期末考试数学(文)试题
名校
3 . 已知等差数列
的前
项和为
,且满足
,
,则使
取最大值时的
的值为( )
A.8 B.10 C.9或10 D.8或9
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/366dfedff1a1a96ec27650375b680059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5032706dd285c22e149c675da465d9ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.8 B.10 C.9或10 D.8或9
A.8 | B.10 | C.9或10 | D.8或9 |
您最近一年使用:0次
2016-12-04更新
|
720次组卷
|
2卷引用:黑龙江省双鸭山市第一中学2019-2020学年高一下学期期末考试数学(文)试题
解题方法
4 . 已知数列
是等差数列,其前
项和为
,若首项
且
,有下列四个命题:
;
;
:数列
的前5项和最大;
:使
的最大
值为10;
其中正确的命题个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fa8beb4c49deeb32de236126b488d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c01d9d2fdc778aef8f6c4b4974ad0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c175dedaf61348bf2045e92f946dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee50575e3ebd56c4f46dd0bbf8e55d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
其中正确的命题个数为( )
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
名校
5 . 在等差数列
中,
,若
最小,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f1ab9fc982805e904a2a136ba391ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.18 | B.27 | C.36 | D.54 |
您最近一年使用:0次
6 . 若等差数列
满足
,
,则当
________时数列
的前
项和最大.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://img.xkw.com/dksih/QBM/2015/11/5/1572280113553408/1572280119361536/STEM/434f23e3ab134b74bce493928f52782a.png?resizew=107)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c5abfd188bc5ca0322ec4a5a1bb053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.15 | B.16 | C.8 | D.9 |
您最近一年使用:0次
2015-10-27更新
|
526次组卷
|
2卷引用:2015-2016学年黑龙江大庆实验中学高二上学期开学考试理科数学试卷
名校
解题方法
7 . 已知
是等差数列,
是其前
项的和,则下列结论错误的是( )
![](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)
A.若![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若首项![]() ![]() ![]() ![]() |
您最近一年使用:0次
名校
8 . 已知公差不为零的等差数列
的前n项和为
,点(n,
)都在二次函数
的图象上(如图).已知函数
的图象的对称轴方程是
,若点(n,
)在函数
的图象上,则函数
的图象可能是( )
![](https://img.xkw.com/dksih/QBM/2017/3/28/1653752569987072/1654201651838976/STEM/7df6450c2415451580dc4055a2715349.png?resizew=142)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb90149fe645dda8e7f9da825b1d302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5946299ed8f8c741a82c8d920e1e206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5946299ed8f8c741a82c8d920e1e206.png)
![](https://img.xkw.com/dksih/QBM/2017/3/28/1653752569987072/1654201651838976/STEM/7df6450c2415451580dc4055a2715349.png?resizew=142)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次