已知数列
满足
,且
.
(1)求数列
的通项公式;
(2)设
,数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65bdfd592f818d0fec5293076f6e7348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6246d3caa133d7449288206b880760.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2de4ff7eab82bdd9cf46dfa6e8a548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc1f5d407c0e99344ed5f0f5926c5d22.png)
22-23高二上·陕西咸阳·阶段练习 查看更多[3]
更新时间:2022-10-13 21:43:55
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解答题-证明题
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适中
(0.65)
【推荐1】设各项均为正数的无穷数列{an}和{bn}满足:对任意n∈N*都有2bn=an+an+1且
=bnbn+1.
(1)求证:{
}是等差数列;
(2)设a1=1,a2=2,求{an}和{bn}的通项公式.
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(1)求证:{
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(2)设a1=1,a2=2,求{an}和{bn}的通项公式.
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【推荐2】已知正项数列
满足
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.
(1)求数列
的通项公式;
(2)设
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的前
项和
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9c2868d205b918f9581503e64a66ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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【推荐1】已知a,b,c分别为
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(2)若
的最短、最长边分别为等差数列
的第一、二项,记
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544ecf30f742a58eaf690f114bbd8f86.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b548734ac2a47d6c079d592626b836d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd969d94d970c48848160788a63e0d2.png)
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解答题-问答题
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适中
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解题方法
【推荐2】已知数列
是等差数列,其前
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,
.
(1)求数列
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(2)若数列
满足
,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/b1dfe5b322577f02fd19caab8cf20170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b170560f44bdef56b9248ffa10b1c91.png)
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![](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
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca857b7a6a1fe09827ecaa5f4c036069.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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解答题-证明题
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适中
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名校
解题方法
【推荐1】已知等比数列
的首项为2,且
,
,
成等差数列.数列
的首项为1,前n项和为
,且
.
(1)求等比数列
的通项公式;
(2)求证:数列
为等差数列;
(3)若数列
的公差为2,数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
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(1)求等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a6c852d593cb9f6bdfd9eeddb50fa3.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】设数列
满足
,
,且对任意
,函数
满足
.
(1)求数列
的通项公式;
(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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0ee2535b088761a42c4bf363a64db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2718326f36c1aaf65593f5e25d7cdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071e33d8c790146a3ecc330967ce20c3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd49a725656c9b4dcf3092fa2eb21ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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【推荐1】已知
为数列
的前
项和,且
是
和
的等差中项,记
,求数列
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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【推荐2】已知函数
,对任意
,都有
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(1)求
的值.
(2)数列
满足:
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前
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(3)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9736d95ac29f7d90b42a3d73bb3255.png)
(1)求
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(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c8fd3a337838203af97e0fd1ac7e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53376a77af84731af5ea59b6ee3ad32d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f479c37c1e46c8080c9834cd0d3a549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7b6e02062f51341970edbd74e71f29.png)
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