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
解题方法
2 . 等差数列
的前
项和为
,若
的值为常数,则下列各数中也是常数的是( ).
![](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/fa803a9fb1bed24c2e8da72ed7f5e90b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 已知无穷数列
是各项均为正数的等差数列,则有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 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
5 . 设等差数列
的前
项和为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fccaaf454fd4a5e89da3aeecf63684.png)
则下列结论中正确的是( )
![](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/70fccaaf454fd4a5e89da3aeecf63684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9c757bd9205f2603eb9f234505eef7.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
6 . 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
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
8 . 设数列
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db10a01eb924c207ceb88eca2011010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e6aacb26fa582eaa3a9025fe093359.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
9 . 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
10 . 将正奇数集合从小到大按第
组有
个奇数进行分组,则2007位于第( )组中.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceef1abeeef220b4fe5f7d96feedd90.png)
A.13 | B.14 | C.15 | D.16 |
您最近一年使用:0次