在等差数列
中,
,
.
(1)求
的通项公式;
(2)若
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d85a4a78ba6d4e5741cc34966a972f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d273fdc7863a6c0279bcd03bf59a7608.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
更新时间:2022-04-30 17:17:33
|
相似题推荐
解答题-问答题
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适中
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解题方法
【推荐1】设正项数列
的前n项和为
,且
.
(1)求
的通项公式;
(2)若
是首项为5,公差为2的等差数列,求数列
的前n项和
.
![](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/8000fb7f840617503890d70eeccc7de6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d6d0dcdbfbc7f6fd6ebb16df6320be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】数列
满足
,
.
(1)证明:数列
为等差数列.
(2)若
,求数列
的前
项和
.
![](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/f2a4a2a4795b9787e64ad44b7baf36c2.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c2bd103f9292082fc6343f58ba87a.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/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知数列
是等差数列,其前n项和为
,且
,
.数列
为等比数列,满足
,
.
(1)求数列
,
的通项公式;
(2)若数列
满足
,求数列
的前n项和
.
![](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/b1dfe5b322577f02fd19caab8cf20170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b170560f44bdef56b9248ffa10b1c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c968ef8f37cbc55d57380015e0229f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4e1d8d8a674b33bc520e809702cbda.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1554715dd6701514c74a80d46c0be76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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
解题方法
【推荐2】数列{an}的前n项和为Sn=2n+1﹣2,数列{bn}是首项为a1,公差为d(d≠0)的等差数列,且b1,b3,b11成等比数列.
(1)求数列{an}与{bn}的通项公式;
(2)设cn
,求数列{cn}的前n项和Tn.
(1)求数列{an}与{bn}的通项公式;
(2)设cn
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c16102f7771d5bd14fdd35f4f240ed.png)
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解答题-证明题
|
适中
(0.65)
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解题方法
【推荐1】已知各项均为正数的数列
的前n项和为
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2db5a993ec7c5bdc4ae53cd98d0c2f.png)
.
(1)求证:数列
是等差数列,并求出
的通项公式
(2)若
表示不超过x的最大整数,如
,
.求
的值.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2db5a993ec7c5bdc4ae53cd98d0c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aee2a824cdfa15a38f3480d3dd28f42.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832d1e3a06f59a35396aac6e12c5e2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c7e0bd4e7f5887992acd53a1d71f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee38e14190b77a1ae4d55155eb0be0c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3937085feed35af3762f7db06077055.png)
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【推荐2】在①
,②
这两个条件中任选一个,补充在下面问题中并解答.
问题:已知数列
为递增数列且满足
,
且________,求数列
的前
项和
.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c734f347314f64b76e48ab0aeb8984b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb7cba4abad7d50257ada7d9f188d28.png)
问题:已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55d8d7bb99a601fe0d3b97b8e70579d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.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/08eb71ecf8d733b6932f4680874dbbf3.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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