1 . 在“①
,
,
;②
,
;③
”三个条件中任选一个,补充到下面的横线上,并解答.
已知等差数列
的前n项和为
,且__________.
(1)求
的通项公式;
(2)若
,求
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2798e1dcab1f7f0fe3b8a94b3cd6a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32bf208aa9492eb76433c006f0c5f6c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5db0a65ff0a2fd42387cfdeac3183f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb42efc340520333fde68ea5272dbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9151e32faec5d08634a03f9e0278f9f5.png)
已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9928e46511e601913619a427ded84a3.png)
您最近一年使用:0次
解题方法
2 . 已知各项均为正数的等差数列
,
,
,
,
成等比数列.
(1)求
的通项公式;
(2)设数列
满足
,
为数列
的前n项和,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39835887158fcba559fdfe35ebb5c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3140b3689490495aebfe7c69c1dd9ed9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feeedbb52b8d99567f177d0addbf409b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9c7634e666b093f6e495378061a2ad.png)
您最近一年使用:0次
名校
解题方法
3 . 已知数列
为等差数列,
,数列
满足
,且
.
(1)求
的通项公式;
(2)设
,记数列
的前
项和为
,求证:
.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630098e784020faff7321e96fc9bdd42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab7d59ce066c8f0b346719003f8e28f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a3142edf5c4c0da42010fbbd78a099.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1056f02e4a7e9b8fd479519eec2d9b3.png)
您最近一年使用:0次
2022-01-26更新
|
1770次组卷
|
4卷引用:山东省德州市2022届高三4月联合质量测评数学试题
解题方法
4 . 数列{an}的前n项和记为 Sn,a1=2,an+1=Sn+n,等差数列{bn}的各项为正,其前n项和为Tn,且 T3=9,又 a1+b1,a2+b2,a3+b3成等比数列.
(Ⅰ)求{an},{bn}的通项公式;
(Ⅱ)求证:当n≥2时,
.
(Ⅰ)求{an},{bn}的通项公式;
(Ⅱ)求证:当n≥2时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6400ddd448301685806ad75d43be36a0.png)
您最近一年使用:0次
名校
5 . 已知公差不为零的等差数列
,满足
成等比数列.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若
,数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc145578a0183ba4d80b10c072b7f188.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d787a9e10d72bba6e3003db3a2dd35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4745c3a29a66285e380c867bd2dc99.png)
您最近一年使用:0次
2016-12-03更新
|
553次组卷
|
2卷引用:2015届山东师范大学附属中学高三第四次模拟考试文科数学试卷