已知公差不为零的等差数列
的前4项和为10,且
成等比数列.
(Ⅰ)求通项公式
;
(Ⅱ)设
,求数列
的前
项和
.
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/600d95b7353741cba5ae988a40e4641f.png)
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/480de55da7fb43da8fc216a75af89847.png)
(Ⅰ)求通项公式
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/794b9945081147deb53866e0c0690358.png)
(Ⅱ)设
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/a3e52a47bb284803be26369d232209ad.png)
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/a209e10df82a4d2691d95f13b825fb0c.png)
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/fb235bb129994a3b8308f6375c5ea767.png)
![](https://img.xkw.com/dksih/QBM/2012/8/31/1570995662454784/1570995667935232/STEM/744c09b6e86740e5bc0710c0bec2ce8e.png)
2012·海南·一模 查看更多[3]
(已下线)2012届海南省高三高考极限压轴卷理科数学试卷(已下线)2011-2012学年云南省芒市第一中学高二下期末数学试卷(已下线)2.5等比数列的前n项和(1) -2020-2021学年高二 数学课时同步练(人教A版必修5)
更新时间:2016-12-01 22:42:54
|
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知等差数列
的前项和为
,满足
.
(1)求出数列
的通项公式;
(2)若数列
满足
,试求数列
的前
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.
![](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/263f7f8e2caa43467a5453fef9b851ca.png)
(1)求出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc62c7cd604d5b43a881462caf74f50.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)
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【推荐2】已知
为等差数列,其中奇数项和比偶数项和大15,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e106dbf72e201e7fcce6057f60fe59a.png)
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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
是等差数列,且
.
(1)求
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/e216debbcd2d95d2813314b878436411.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c20979da0cb3c6348ee0d3a140a6b13.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2】在①
,②
③
这三个条件中任选一个,补充在下列问题中,并作答.设
为等差数列
的前
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是正项等比数列
,且___________.
(1)求数列
的通项公式;
(2)如果
,写出
之间的关系式
,并求数列
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/39754af96e1286b859a89e1cd66612c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39fde95129be384db6d251c2fb14fc6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5983ff07e55dfbd97d0299a1b98ea32.png)
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7bfec4e3571a297b84612be7e4d209.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a14f73dab56901f746ab0721288a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ddd0f52c847c0241344de8d30fd4fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b35eadc34855de68a104aa47ed9e624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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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