1 . 数列
中,
是公比为
的等比数列,满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1156fc48b924e55d4ba44f8f1a1aa4.png)
,则公比
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173ee7c4bf21c0f9cc0afc5399d31fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c22c96b4d06bc3172cbeb08f4e8c4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1156fc48b924e55d4ba44f8f1a1aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34135f1852691308a7bc8cff942176c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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名校
2 . 已知数列
的前n项和
,那么下述结论正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a465b1cf5138008d5ba67a4c4b298c5.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() |
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2018-08-13更新
|
948次组卷
|
5卷引用:甘肃省武威第十八中学人教版高中数学必修五单元测试:第二章数列
3 . 在
之间插入n个正数,使这n+2个正数成等比数列,则插入的n个正数之积为____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbe12ddcd28cc073b49dd90ce142f6e.png)
您最近一年使用:0次
2018-08-13更新
|
395次组卷
|
2卷引用:甘肃省武威第十八中学人教版高中数学必修五单元测试:第二章数列
解题方法
4 . 数列
中,已知
,
,且
,则此数列为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c752ebe8516e7d3327f3410473d9a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7110f600351b404b84e6d252d36b4ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668843babdcdfff4d7842a458fe63e26.png)
A.等差数列 | B.等比数列 |
C.从第二项起为等差数列 | D.从第二项起为等比数列 |
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5 . 当
时,
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/214ebb74071258772d293332e8bbca14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce5e531a5c9c742c43fbdfe2c33799b.png)
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6 . 已知等差数列
与等比数列
的首项均为1,且公差
,公比
且
,则集合
的元素最多有
![](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/d5cdbc93cbc668992cb2a146df08bf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e420efb2afd06e85a595f837242ef61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369c7e3138987c4b997d86e6777df930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b05b98f54cd1926ecd60be65833d88.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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解题方法
7 . 设
为数列
的前
项的和,且
, 数列
的通项公式
.
(1)求证:数列
是等比数列;
(2)若
,则称
为数列
和
的公共项,按它们在原数列中的先后顺序排成一个新的数列
,求数列
的通项公式.
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a541b9c0fd7a643a1fbe68a7e6f3546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fe039e345bbd6c79162fe220a95ad9.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3d737585ce0e012ca6decce2e42277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](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/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
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