名校
1 . 若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
为等差数列,
为其前n项和,若首项
,公差
,则使
最大的序号n为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06dd3c3b45125d4b484e2894992610f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f55505fb7feb499bd254acc7853b66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
2016-12-03更新
|
559次组卷
|
2卷引用:2015-2016学年湖南师大附中高二上学期期中文科数学试卷
2 . 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学年湖南省株洲县五中高二下学期第一次月考理科数学试卷