1 . 已知等差数列
的前n项和为
,若
,且
,则
( ).
![](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/13cf11633fb4d3852e380007361f4e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61d2fbacb2895b7606f4956f443fc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7bf78468ca801ef305ce4f76986da1.png)
A.62 | B.64 | C.66 | D.68 |
您最近一年使用:0次
2 . 如图的程序框图的功能是计算数列
前
项和的最大值
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/b7c07e2a-1124-40b2-b31a-bb70dfed06f7.png?resizew=91)
您最近一年使用:0次
3 . 等差数列
满足
为其前
项和,那么
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e5d5daedcaaa2a76d4d99d6ab8ef89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38f53de0fa9199d26912916bcd2a6d5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 两个正项递增数列即等差数列
和等比数列
满足
,
,
,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/89fe0f4e8a80a2840c0f6929a8a6351b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1273751a0b5a984cf01c2d0e00e474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa9f10eef930e0e13e121627dbda106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec28b5d6e3263275d38599aed15ccd2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 设数列
是一个公差不为零的等差数列,
.
(1)当
时,请在数列
中找一项
,使得
成等比数列;
(2)当
时,正整数
,且
,使得
成等比数列,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b83d73d014a0ca4aff4282228312f55.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df1038200f2d97a52c716aab6c3bcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e557d8ccd35f5a83b814aea04e17c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ca337933edf8b0f5e44e0078374008.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb334e165679c6cb500c994cffa47147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1acff66c23432bfa8c8aeb233691695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c698c0b3d1aa664d9571ea407d5ec77a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820305fa45b15fb66d0246e50c076196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1073aaf846f7b51ca1b7e706fd4486de.png)
您最近一年使用:0次
解题方法
6 . 数列1,2,2,3,3,3,4,4,4,4,5,……的第2008项的值为______ .
您最近一年使用:0次
7 . 在数列
中,
,且对于任意大于1的正整数
,点
在直线
上,则
的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6a1f53155d3b285154af880558aee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c5361d3a779bf1f25234e675f91de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2620fb99de8dd68169d75af9aa50dd97.png)
A.27 | B.6 | C.81 | D.9 |
您最近一年使用:0次
解题方法
8 . 等差数列
的前
项的和分别为
,且
,则
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/359e64d757f69f3f2c8a2b718c69d425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484e2bef1fd64bdae609d6b841e56d78.png)
A.![]() | B.![]() | C.![]() | D.以上均不对 |
您最近一年使用:0次
9 . 等差数列
的前
项和分别为
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d361f09e7ca6d59ce71fe2c6da7f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1f959646f47d0b32bfa6a3411ae55f.png)
A.![]() | B.![]() | C.![]() | D.以上答案均不对 |
您最近一年使用:0次
10 . 等差数列
的公差
,且
,则
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec5092048ae59b74623c4be1048c8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024883b76ade698fd36d21c8c2e804f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87a28adb8a5d523c8a528de6070d257.png)
A.85 | B.145 | C.110 | D.90 |
您最近一年使用:0次