1 . 已知数列
的首项
,且满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97034664bd213a31e81b9625f83d0e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 记
为等差数列
的前
项和,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.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/738dc67ac3b150252a964d1ffe3dfa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8657a9f3eec0c1b0efa818f778129e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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解题方法
3 . 在等差数列
中,
,
.记
,则数列
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac577f987d768e1a115f2747ec0fd6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3af4204cbd59c0bc15f5d83b240a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e86085af56b48fa5941f0fd0cf2b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de777c4e44546bcfe26ad5b6bb418052.png)
A.有最大项,有最小项 | B.有最大项,无最小项 |
C.无最大项,有最小项 | D.无最大项,无最小项 |
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4 . 已知数列
是以1为首项,2为公差的等差数列,
是以1为首项,2为公比的等比数列,设
,
,则当
时,n的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000f01319364c59dee948848fc4de4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad1560acd0d17e7b3778be5c47d5aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254db7a87ad580b68a31564d649508c7.png)
A.8 | B.9 | C.10 | D.11 |
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2022-01-11更新
|
1335次组卷
|
7卷引用:北京市第五中学2022届高三下学期三模数学试题
5 . 已知等差数列
的前
项和为
,则
等于( )
![](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/a8a6c664a74d5d3875cc8ef5e01d8aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05201ef79a5d5904f492845396fb5470.png)
A.27 | B.24 | C.21 | D.18 |
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6 . 已知公差为正数的等差数列满足
成等比数列.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd8e16b5cce392a12326fa2f3ee9acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e554e17bb75fb6ca18e00995a0e9330b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be87365151702d8b0a4f31450637ed15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2023-10-17更新
|
577次组卷
|
3卷引用:北京市广渠门中学2024届高三上学期10月考数学试题
北京市广渠门中学2024届高三上学期10月考数学试题(已下线)第05讲 4.3.2等比数列的前n项和公式(7类热点题型讲练)-【帮课堂】2023-2024学年高二数学同步学与练(人教A版2019选择性必修第二册)上海市金山中学2023-2024学年高二下学期3月月考数学试卷
7 . 已知
是等差数列,其前n项和为
.
(1)求数列
的通项公式及
;
(2)从条件①、条件②、条件③这三个条件中选择一个作为已知,求数列
的前n项和
.
条件①:
;
条件②:
;
条件③:
.
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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9e2546c5ca10056fbef4750abb7236.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)从条件①、条件②、条件③这三个条件中选择一个作为已知,求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449f35002286a48a6524466e671d9314.png)
条件③:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d005409790b3192705a181b2c8e7dfed.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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8 . 已知数列
满足
,设
,则下列结论正确的是__________ .
①
;②
;③
;
④若等差数列
满足
,其前n项和为
,则
,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079379e98c64ed151ce940ca96e32bca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dc54d8d2c72d68d67b1567df505af5.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c741481a45a6ab9849704b98d3f019ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2b4b2a3149acb1f9fa0222a618ab9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12954f5893ebaf49622577e3c4335501.png)
④若等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2448cf72af76b810310e4cfb9818e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032d1d13ba0ff6ad80eff588e16ede8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadd51d72723320ae712a8a7622551cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d55698ccf0aa9af5886068e997fefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e748a7536f56e6995fd0e72e472b5b91.png)
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9 . 在数列
中,
,且
递增,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082f73bd99c89ad820e580ecce5cddad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85726f99979d3793ea28b77a7708f4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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10 . 已知
是公差为正数的等差数列,
,且
.
(1)求
的通项公式;
(2)求
的前n项和
;
(3)求
的前n项和
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dc759e6f45cff8dacef4206490e98a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beca3ad13c32955b4ed7f457a8b95c38.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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