解题方法
1 . 已知等差数列
的前
项和为
,若
,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/5d5ea799bbc22c1e2abeb5a369753e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
A.33 | B.54 | C.64 | D.81 |
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名校
2 . 从1,2,3,4,5,6,7,8,9中依次取出3个不同数字a,b,c,若a,b,c成等差数列,则不同的取法种数为( )
A.16 | B.24 | C.32 | D.48 |
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3 . 等差数列
中,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e7556d002592971eef642a6c5c4465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0313eea2c65393728d83a287a8b799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b4a2ab0657d2d6830bb6be2b17b6.png)
A.![]() | B.![]() | C.0 | D.2 |
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名校
4 . 已知数列
,
,
,4成等差数列且
,
,
成等比数列,则
的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243c79a99a4b37a62e8005012ae8dae9.png)
您最近一年使用:0次
2024-04-17更新
|
452次组卷
|
2卷引用:安徽省六安市裕安区新安中学2023-2024学年高二下学期第一次月考数学试题
解题方法
5 . 设等差数列
的前
项和为
,则当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ 时,
最大;使
的
的最大值为______ .
![](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/162dd0ce22a80b6a4cb2b62652544c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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6 . 2024央视春晚魔术表演的背景是约瑟夫问题,这是一个经典的数学问题,用数学语言可描述为:将数字
顺时针排列在圆周上,首先取走数字2,然后按照顺时针方向,每隔一个数字就取走一个数字,……直到圆周上只剩下一个数字,将这个数字记为
. 例如
时,操作可知
,则 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c9ed47c1956cbc39133ee8ad204c25.png)
_____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9662947cb47a88371b8863a22b6b965b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca938b90da7b092f7121ce06036d2ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e10d741869324d7de523517e9af8d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c9ed47c1956cbc39133ee8ad204c25.png)
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名校
解题方法
7 . 已知等差数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)若
,求数列
的前
项和
.
![](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/bbca33843bb50f367b77b6dd443b3911.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f207aed73824768dc75aba2f95b0d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
8 . 在等差数列
中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d4ff609697cb058b564c17fd61afd0.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a58019b1b2a7a79ba8ff7b782059abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d4ff609697cb058b564c17fd61afd0.png)
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9 . 在等差数列
中,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48cba8926eb4a5bd1e356354e7b07ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d868ad8750eefd545a4344594dd982d5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-01-08更新
|
915次组卷
|
3卷引用:安徽省皖中名校联盟2024届高三上学期第五次联考数学试题
安徽省皖中名校联盟2024届高三上学期第五次联考数学试题湖南省长沙市德成学校2023-2024学年高二上学期期末数学试题(已下线)1.2.1 等差数列的概念及其通项公式(分层练习)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第二册)
10 . 等差数列
中,其前
项和为100,其前
项和为500,则其前
项和为______ .
![](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/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f41be870e84c819362787849770519.png)
您最近一年使用:0次