名校
1 . 对于
的子集
,定义
的“特征数列”为
,
,…,
,其中
,其余项均为0.例如:子集
的“特征数列”为0,1,1,0,0,…,0.若
的子集
的“特征数列”
,
,…,
满足
,
,
;
的子集
的“特征数列”
,
,…,
满足
,
,
,则
的元素个数为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1550b36bd0d1abc421a529df223f1d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e54c671b678b9eb9bd214464da9eecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e4c6544ede4573bd9a07d116f5cfb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/506d1ac280b71c631cd4e9b63d009ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bb95534f703ac3e6328ef5be7a9f93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed794854ded63e016e678e467b5c6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6268630d5e5288048d32f4aa5c8bc02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c171ff5c2728e7cf00a88f88de14f308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c02e55edaf83351e20283be2048b0a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d563dc363f21db86f5525ac9bc29e1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97479eeeb877265dd63307c9460abd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d11e5426cf3f6332a4a7f73065e880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4afabfd5b4885311f8d9a4bcf791b71.png)
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2 . 定义:如果一个数列从第2项起,每一项与它前一项的差都大于或等于2,则称这个数列为“D数列”.
(1)若首项为1的等差数列
的每一项均为正整数,且数列
为“D数列”,其前n项和
满足
(
),求数列
的通项公式;
(2)已知等比数列
的每一项均为正整数,且数列
为“D数列”,
,设
(
),试判断数列
是否为“D数列”,并说明理由.
(1)若首项为1的等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](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/1546019868f760bbfc1e8ddaea757c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d18186e394aa92257ddc0e644383cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4095513ce0c92852c8ef4008d43c7ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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3 . 已知
均为非负实数,且
.
证明:(1)当
时,
;
(2)对于任意的
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4099e1919c5450fd97590c4858c2d37c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81224c37d3740e35f03d6ff902adfe24.png)
证明:(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d48e59fe8e97b6d8323bfe778e7bcc.png)
(2)对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c154ab0e89e6303f44aaeecf959454ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f71ffa702e15a1a7cfd815463d49a2.png)
您最近一年使用:0次
2020-02-25更新
|
306次组卷
|
2卷引用:湖南省岳阳市2024届高三下学期考情信息卷数学试题
名校
4 . 对于数列
,定义
为数列
的“好数”,已知某数列
的“好数”
,记数列
的前
项和为
,若
对任意的
恒成立,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12768b10b962491becd451cc2344edfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbae509487017488129b6bdd5c623bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0154793cb1ae73b08e85822ceee391f2.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/dca8bfde33f35826d7e355679c6485e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2020-02-22更新
|
1128次组卷
|
7卷引用:2020届湖南师范大学附属中学高三月考试卷(三)数学理科试题
2020届湖南师范大学附属中学高三月考试卷(三)数学理科试题(已下线)考点20 等差数列与等比数列-2021年新高考数学一轮复习考点扫描新疆哈密市第十五中学2021届高三上学期第一次质量检测数学试题江西省新余市第四中学2021届高三上学期第五次段考数学(文)试题江西省新余市第一中学2019-2020学年高一3月零班网上摸底考试数学试题江苏省南通中学2020-2021学年高二上学期期中数学试题(已下线)上海市华东师范大学第二附属中学2022-2023学年高一下学期期末数学试题
5 . 已知首项为
的等比数列
的前
项和为
,且
,
,
成等差数列.
(1)求数列
的通项公式;
(2)对于数列
,若存在一个区间
,均有
,则称
为数列
的“容值区间”.设
,试求数列
的“容值区间”长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.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/04e406b775bbaa0ae52dab5b7bd384a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0b99a3e6cab1cde1bb575f2b228e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a888492710e24e13dcf15448f43e8174.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)对于数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621604766ddd141c86e37da5e71aef26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f144b23a6628703ef1b9546ecd418d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621604766ddd141c86e37da5e71aef26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b477cc2b249061d0eb6839114172b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
2020-02-15更新
|
872次组卷
|
5卷引用:2020届湖南省长沙市雅礼中学高三第5次月考数学(文)试题
2020届湖南省长沙市雅礼中学高三第5次月考数学(文)试题2020届湖南省娄底市高三上学期期末教学质量检测数学文科试题2020届河南省平顶山市第一中学高三下学期开学检测(线上)文数试题(已下线)专题06 数列中的最值问题(第二篇)-备战2020年高考数学大题精做之解答题题型全覆盖(已下线)第5课时 课后 等比数列的前n项和