1 . 定义
表示实数
、
中较大的数.已知数列
满足
,
,
,若
,记数列
的前
项和为
,则
的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3054ef0d5dc5823baf2d390bc2b6241.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/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7815c6b825bbbb134ed7d9dd81d909f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76853e1b5ecff331be1b7cc28d85d2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55fb7ab258e9bf3e4b213e28a5141ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/a3d5611c524c9abbcb4c9c1eb04a3791.png)
A.2014 | B.2015 | C.5235 | D.5325 |
您最近一年使用:0次
2 . 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
3 . 已知等比数列
首项
,公比
,用
表示该数列前
项之积,则
中最小的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec27946635ce99f0439621ce87e4317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb08ac8920645c616053c845978bdf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
4 . 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
5 . 已知函数
,若数列
满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd3b3ac25920d6e6e1f87929042882c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bff9153c82e73db160421d64b86626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb4c2355ce193435dc15fdc006fd237.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 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
7 . 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
解题方法
8 . 在数列
中,
,若数列
是以3为公比的等比数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636a4c1710469f090d45f77976d16a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175b4855b799d276f733969aa6b34d4b.png)
A.1006 | B.1007 | C.1008 | D.1009 |
您最近一年使用:0次
解题方法
9 . 已知三个正数a,b,c成等比数列,则
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc98df461735c2d82a1d00bc7c9290a9.png)
A.1 | B.![]() | C.2 | D.![]() |
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解题方法
10 . 已知
的三内角
所对的边分别为
,若
成等比数列,则
的取值范围为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4959f1815d142c2764a62e1d413479a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次