解题方法
1 . 等差数列
的前
项和为
,若
,则下列结论错误 的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/04220944a0b457100a53c3e8cf3e4693.png)
A.![]() | B.![]() |
C.数列![]() | D.数列![]() |
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2 . 各项不全为
的等差数列
,前
项和为
.若
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e76d623bf24ea4b9370076ee4a8ca2c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be791021ffea63794559aa573610c630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de58863cdfd23e7aac1d03940ef1c84b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e76d623bf24ea4b9370076ee4a8ca2c.png)
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解题方法
3 . 下列关于等差数列和等比数列的叙述正确的是( )
A.若非常数列![]() ![]() |
B.若非常数列![]() ![]() |
C.若数列![]() ![]() ![]() ![]() |
D.若等差数列![]() ![]() |
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4 . 已知数列
是公差为
的等差数列,其前
项和为
;数列
是公比为
的等比数列,其前
项和为
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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5 . 已知等差数列
的公差d>0,则下列四个命题:
①数列
是递增数列; ②数列
是递增数列;
③数列
是递增数列; ④数列
是递增数列.
其中正确命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
①数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
③数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
其中正确命题的个数为( )
A.1 | B.2 | C.3 | D.4 |
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2020-06-19更新
|
469次组卷
|
3卷引用:黑龙江省佳木斯市第一中学2019-2020学年高一下学期第一学段考试理科数学试题
名校
解题方法
6 . 已知数列
的前
项和为
.
(1)求
的通项公式;
(2)求使得
最小时
的值.
![](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/ead071a49f9fb5c91458b48fe98abbf2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解题方法
7 . 设等差数列
的前
项和为
,公差为
,且满足
,
,则对
描述正确的有( )
![](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/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa782abec7c4403b87271b92cb70b84a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2020-05-23更新
|
797次组卷
|
6卷引用:河北省石家庄二中2019-2020学年高一下学期期中数学试题
名校
8 . 已知
是等差数列
的前n项和,且
,给出下列五个命题:①
;②
;③
;④
;其中正确命题的个数是
![](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/2f0fb2f484d3d73b26acc02ffdc56a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8bbb4a09e0ac86bbae46222a90841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d4688b8b20ecd1c8f6e3fa0b1eab62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce868ac245a30cc99db2b35b2fabc545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5498fbc6ce75d6b904152f231913ab4.png)
A.4 | B.3 | C.2 | D.1 |
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2020-02-20更新
|
741次组卷
|
4卷引用:四川省绵阳市绵阳中学2018-2019学年高一下学期期中数学试题
名校
解题方法
9 . 两个等差数列
、
的前n项和分别为
、
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d3d080db7dc0e796230816506deff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bfc3bfd046d79a6b0395ae6422f2fbe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 等差数列的
公差
不为0,
是其前
项和,给出下列命题:
①若
,且
,则
和
都是
中的最大项;
②给定
,对一切
,都有
;
③若
,则
中一定有最小项;
④存在
,使得
和
同号.
其中正确命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8bbb4a09e0ac86bbae46222a90841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277d63e2ebf03b22f9f110b436342043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27182444d3da4003680f07ec299087c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
②给定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9d891f1d76805fe6a317c0d5b7c9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668a397301141b4e3fa8109515847004.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
④存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e36bff57bcfa86432b340e25e51d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68040f99c4f1199f33ae9e269b700db0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177e4374fb738c4f13dc58e9025c88e4.png)
其中正确命题的个数为( )
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次
2019-12-23更新
|
507次组卷
|
3卷引用:河北省邯郸市馆陶县第一中学2019-2020学年高一下学期期中数学试题