1 . 等差数列
中,已知
且公差
,则其前
项的和
取得最小值时
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c588eaa0bd3a975a4012ee3ba4bc0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.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.7 | B.8 | C.9 | D.10 |
您最近一年使用:0次
解题方法
2 . 若等差数列
中,
,公差
,则使前
项和
取得最大值的
是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e7e0a2647832427750cbb8e74965ff.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.8 | B.7或8 | C.8或9 | D.7 |
您最近一年使用:0次
名校
3 . 设等差数列
的前
项和为
,
且
,当
取最大值时,
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.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/d157b8c366da862bb263221f2c566f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc4bbb78ec21bbdf52af21cb324aff1.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
2016-12-04更新
|
935次组卷
|
8卷引用:湖北省荆州市石首市第一中学2021-2022学年高二上学期12月月考数学试题
湖北省荆州市石首市第一中学2021-2022学年高二上学期12月月考数学试题2016届吉林省长春市普通高中高三质量监测二理科数学试卷2016届吉林省长春市普通高中高三质量监测二文科数学试卷(已下线)二轮复习 【理】专题9 等差数列、等比数列 押题专练(已下线)二轮复习【文】专题9 等差数列、等比数列 押题专练【市级联考】贵州省遵义市2019届高三第一次联考理科数学试题2020届山西省太原市第五中学高三11月阶段性考试数学(文)试题浙江省金华市山河联盟2019-2020学年高一下学期期中数学试题
名校
4 . 等差数列
中,
,若其前
项和为
,且有
,那么当
取最大值时,
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d157b8c366da862bb263221f2c566f5f.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/1e42ae098081fc35f91d4bb8e8908a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.8 | B.9 | C.10 | D.11 |
您最近一年使用:0次
2016-12-03更新
|
928次组卷
|
6卷引用:湖北省襄阳市第一中学2019-2020学年高二下学期2月月考数学试题