解题方法
1 . 在等差数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0159906c8d8df90a57ce928e82705f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcb23f78cdc09b331e62046b9eca374.png)
A.7 | B.11 | C.14 | D.16 |
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解题方法
2 . 递增等比数列
中,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9279d84f0582740fade22ab2f22d162e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb101fec6c0541f7bc4104e4112c2bfc.png)
A.![]() | B.![]() | C.72 | D.144 |
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3 . 如果数列
满足:
且
则称
为n阶“归化”数列.
(1)若某3阶“归化”数列
是等差数列,且单调递增,写出该数列的各项;
(2)若某11阶“归化”数列
是等差数列,求该数列的通项公式;
(3)若
为n阶“归化”数列,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd74d93f7af4805bfc62f87f65235abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee30188bbff5205722da63c1e4b432a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(1)若某3阶“归化”数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若某11阶“归化”数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8da756cd2cfb3ac07e5a7d24f122e3f.png)
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解题方法
4 . 设等比数列
的前n项和为
,则“
是递增数列”是“
是递增数列”的( )
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
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5 . 已知等差数列
的公差为
,前
项和为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1115f44e2aecc0b87d657a5c2242bb25.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
6 . 《九章算术》是我国古代数学名著,其中记载了关于家畜偷吃禾苗的问题.假设有羊、骡子、马、牛吃了别人的禾苗,禾苗的主人要求羊的主人、骡子的主人、马的主人、牛的主人共赔偿12斗粟.羊的主人说:“羊吃得最少,羊和骡子吃的禾苗总数只有马和牛吃的禾苗总数的一半.”骡子的主人说:“骡子吃的禾苗只有羊和马吃的禾苗总数的一半.”马的主人说:“马吃的禾苗只有骡子和牛吃的禾苗总数的一半.”若按照此比率偿还,则羊的主人应赔偿的粟的斗数为( )
A.1 | B.![]() | C.2 | D.![]() |
您最近一年使用:0次
2024-07-19更新
|
168次组卷
|
4卷引用:湖南省湘西州2023-2024学年高二下学期期末考试数学试卷
解题方法
7 . 已知数列
的前
项和为
,且
,则下列结论中正确的是( )
![](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/d3768db0f2e2881b810d44ddc39ff295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9d263a48a1691ab27d07a729471c17.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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名校
解题方法
8 . 已知数列
的前
项和
,且满足
.
(1)求
的通项公式;
(2)记数列
的前
项乘积为
,求
的最小值.
![](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/740e22d894ee6c7877a5d5b64530151f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记数列
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9f4f278136d82f6195dd9599ff128c.png)
您最近一年使用:0次
2024-07-18更新
|
476次组卷
|
4卷引用:十五校教育集团鄂豫皖三十八校2023-2024学年高二6月阶段联考数学试题
十五校教育集团鄂豫皖三十八校2023-2024学年高二6月阶段联考数学试题(已下线)专题22 类比与结构思想解等比数列问题(一题多变)河南省部分学校2025届高三7月联合质量检测数学试题(已下线)5.3 递推公式求数列通项公式(讲义)
9 . 记
为等差数列
的前n项和,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046014a01471501ec13577b4a3ae1cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
(1)求
的通项公式;
(2)记
求证:数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9135a6c67cf88b814b5781276f8809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046014a01471501ec13577b4a3ae1cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492c996c18df86e8b1332e0fefcefa22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9135a6c67cf88b814b5781276f8809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
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10 . 已知数列
满足
,
,数列
是正项等比数列,且
,
.
(1)求
,
的通项公式;
(2)从下面①②两个条件中选择一个作为已知条件,求数列
的前
项和
.
①
;②
.
![](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/be29d8f996c54183663d8a954166dc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d4e1c98b9f5bf308a423dfa2369fff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671bac56657a5789cc1aaad25922395a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)从下面①②两个条件中选择一个作为已知条件,求数列
![](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)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef302ebcaec5e560bbaf76992e996af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
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