已知数列
的前
项和为
,且
,正项等比数列
满足
,
.
(1)求数列
与
的通项公式;
(2)设
,求数列
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/a2e4abab4ad91243388aec08d92d15f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfcba31b4b02ba57ca40c91f6c09f0e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
更新时间:2019-12-03 19:40:39
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)设
,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/1b7762dc97039f1a8b743a580020ac0a.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df1e8c28789ee186157ec527a7f5199.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)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知各项均为正数的数列
的前
项和为
,且
为等差数列.
(1)求数列
的通项公式;
(2)若
为正整数,记集合
的元素个数为
,求数列
的前50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/e11dccf47be6df9d6bbba6750aa1f790.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbe97d5fe84491b8faad7de400451e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】已知各项均为正数的等比数列
的首项
,
为其前
项和,若
,
,
成等差数列.
(1)求数列
的通项公式;
(2)设
,记数列
的前
项和为
.若对
,
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61eb2023d319823e6ad5815a695ee4e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663bbc5767b9cb453cb08e1f0a8e0602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545d7304f2062d6bbd24b82a5d03c9e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a065d8b43f81b586a53d1d0334386d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f37809a0bafdfe8403c5cba5b952778c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61eb2023d319823e6ad5815a695ee4e9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d1467601b24e6567c4e9305dbd247c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9468b108ea844a5ca5b2811b6668cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daca83a7d5dd024f1b7338df1377bf48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b599983d6ee4bbbaede66b450f45a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知等比数列
满足:
,且
是
的等差中项.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若数列{an}是单调递增的,令
,
,求使
成立的正整数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3692d1cd54aaa7e2321fff5142e5d2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d473bfcc52ebc119430335531488a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a826ead2adf4c861699c3db58d151c6.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)若数列{an}是单调递增的,令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3cfa8a317c2b60fa0fec595908d690d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73913b1e84cc69c76c8d8575ea2ec0a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c46cd6ab5f9f743a36b720290e69ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7907e185e01cc6907ddedda5bb07e24a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
【推荐1】已知数列
满足
,且
.
(1)证明:
为等差数列,并求
的通项公式;
(2)令
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf2a234b8102356b2c13a3c0b75a00e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd6a821825904d9e90fdd97d823097b.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb217a2125c3089bff96bb95569ccbe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e002c016766bdb026ab5096a76b0569e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b667de0002d5ebc53b9d9c804d30d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知a2,a5是方程x2-12x+27=0的两根,数列{an}是递增的等差数列,数列{bn}的前n项和为Sn,且Sn=1-
bn(n∈N*).
(1)求数列{an},{bn}的通项公式;
(2)记cn=an·bn,求数列{cn}的前n项和Tn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求数列{an},{bn}的通项公式;
(2)记cn=an·bn,求数列{cn}的前n项和Tn.
您最近一年使用:0次