名校
解题方法
1 .
年
月
日,第四届中国国际进口博览会在上海开幕,共计
多家参展商参展,
多项新产品,新技术,新服务在本届进博会上亮相.某投资公司现从中选出
种新产品进行投资.为给下一年度投资提供决策依据,需了解年研发经费对年销售额的影响,该公司甲、乙两部门分别从这
种新产品中随机地选取
种产品,每种产品被甲、乙两部门是否选中相互独立.
(1)求
种新产品中产品
被甲部门或乙部门选中的概率;
(2)甲部门对选取的
种产品的年研发经费
(单位:万元)和年销售额
(单位:十万元)数据作了初步处理,得到下面的散点图及一些统计量的值.根据散点图现拟定
关于
的回归方程为
.求
、
的值(结果精确到
);
(3)甲、乙两部门同时选中了新产品
,现用掷骰子的方式确定投资金额.若每次掷骰子点数大于
,则甲部门增加投资
万元,乙部门不增加投资;若点数小于
,则乙部门增加投资
万元,甲部门不增加投资,求两部门投资资金总和恰好为
万元的概率.
附:对于一组数据
、
、
、
,其回归直线
的斜率和截距的最小二乘估计分别为
,
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151e5633a5d0cc30b254167e3dda5803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705825a4d8b16a7f857efcdf03ecbcfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d848b410318b14f82111491a042dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/19/12298c64-3c54-40c2-8537-e76cf42d0fd1.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)甲部门对选取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4169c0824ad9e2ea49130af731d729aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73d8eed6c4db6ad2da7427bbbbcd820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16a862478985191ece5a20bbe552bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c6cf002710b9137f3a88500949f22c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
(3)甲、乙两部门同时选中了新产品
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297d80df604133e2e15d990e0613cc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba40e8f80d0b956ae60fc64bddc84b52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40e22bb414edffafbc58ebdf816e392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b6b56d6cfa8ae4046dabcf77bcb70a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9cee9b888256124bf0f4fb2bbd9c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901b19246a5d69ba0334b8fd4dea0281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011d9ee1aad603211cefc32bdfd088e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc20ee33e39795261631e17989cb2530.png)
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2022-02-15更新
|
1552次组卷
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5卷引用:山东省潍坊市2021-2022学年高三上学期学科核心素养测评数学试题
山东省潍坊市2021-2022学年高三上学期学科核心素养测评数学试题(已下线)专题4.2 模拟卷(2)-2022年高考数学大数据精选模拟卷(新高考地区专用)(已下线)专题10-1 统计大题:线性和非线性回归与残差-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)(已下线)专题23 回归方程- 2022届高考数学一模试题分类汇编(新高考卷)福建省厦门第一中学2023届高三一模数学试题
名校
解题方法
2 . 在①
,
;②
,
;③
,
三个条件中选择合适的一个,补充在下面的横线上,并加以解答.已知
是等差数列
的前
项和,
,数列
是公比大于1的等比数列,且_____.
(1)求数列
和
的通项公式;
(2)记
,求使
取得最大值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fa50a0797b57c697d06c3143d999f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bdb8aaf564b8e84435e382a9109ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90221b91dabf8a382486cdb4fea5d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a738600092c6dbff35a59954f8b0788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a539f4656a7ff726f3cd77321bd92744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e46afd640072fd6a5e2c94bb72c698b.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/4414e88541187aa93beb4b5c2601862c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbf68dfbe8feafc4d6b9218b352ffee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2022-05-05更新
|
1503次组卷
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3卷引用:江苏省苏锡常镇四市2022届高三下学期5月教学情况调研(二)数学试题
名校
解题方法
3 . 已知
为有穷数列.若对任意的
,都有
(规定
),则称
具有性质
.设
.
(1)判断数列
是否具有性质
?若具有性质
,写出对应的集合
;
(2)若
具有性质
,证明:
;
(3)给定正整数
,对所有具有性质
的数列
,求
中元素个数的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78dab5f68d424caa15eb7686f8ac2249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae415a09c33aa3e9d1a3dab6c522dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7e9edf6d0468e0f8ca78b8bac63bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b740bc48c9718a294c11a1485fd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f21d7bf91134d8d08668cee5dacc2e8.png)
(1)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd984b8eee88a2c10df0e883c9ef67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed1adc648cc7d8fe7ac43df4b918f11.png)
(3)给定正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2023-01-05更新
|
696次组卷
|
6卷引用:北京市西城区2023届高三上学期数学期末试题
名校
4 . 如图,第1个图形需要4根火柴,第2个图形需要7根火柴,
,设第n个图形需要
根火柴.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898670031757312/2908679870808064/STEM/cbefc279-2a3e-4232-9266-fcebe7c364a8.png?resizew=486)
(1)试写出
,并求
;
(2)记前n个图形所需的火柴总根数为
,设
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab783880d7aabc422916886630fc576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898670031757312/2908679870808064/STEM/cbefc279-2a3e-4232-9266-fcebe7c364a8.png?resizew=486)
(1)试写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)记前n个图形所需的火柴总根数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1606dd20b4b2460ee0807d7f2ee6277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1a208706fe64c4a6709e9de5da2bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2022-02-03更新
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7卷引用:安徽省合肥市第六中学、第八中学、168中学等校2021-2022学年高二上学期期末联考数学试题(B)
安徽省合肥市第六中学、第八中学、168中学等校2021-2022学年高二上学期期末联考数学试题(B)(已下线)专题26 数列的通项公式-1山东省青岛市青岛第一中学2022-2023学年高三上学期期中数学试题(已下线)拓展一:数列递推与通项公式归类(1)安徽省部分省级示范学校2021-2022学年高二上学期期末联考数学试题(已下线)专题08 求数列通项17种常见考法归类(1)(已下线)高二数学开学摸底考01(新高考地区)-2023-2024学年高中下学期开学摸底考试卷
名校
解题方法
5 . 如图,曲线
下有一系列正三角形,设第n个正三角形
(
为坐标原点)的边长为
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/31561290-e63f-4e75-b26a-d4cbf3323654.png?resizew=170)
(1)求
的值
(2)记
为数列
的前n项和,探究
与
的关系,求
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef469c7b7cb9945b984222381b9c000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e03c4f6095c0cd2d0262c738d0b6472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1698b9a76d725f9a254b9798d926fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/31561290-e63f-4e75-b26a-d4cbf3323654.png?resizew=170)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0158862238e250d2a2598b7d4ecd148.png)
(2)记
![](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/193cd138f0535e520e4034c98b646dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2023-02-17更新
|
671次组卷
|
2卷引用:江苏省南京师范大学附属中学2022-2023学年高二上学期期末数学试题
解题方法
6 . 已知无穷数列
满足:①
;②
(
;
;
).设
为
所能取到的最大值,并记数列
.
(1)若
,写出一个符合条件的数列A的通项公式;
(2)若
,求
的值;
(3)若
,求数列
的前100项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6b7c794c3329ca99a71eb07c4a7b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8d9def91c6734e75134ef49ba0418a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a21caee5b908cd571bf28d61be90aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228114fab3c07bc63978df7e2dc31953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8faa0cc59f291d53f801546d5dabe6fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa5e5f1551d40f96a03ca6975e68f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d00457e8d086f28ea1b24bd880c9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297bc58fc87efa1f15d7eb9b5eb42260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fb6fbf69268bc82274bc7ff03010c.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8323901a49cac29afd7d62864f088077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51cf6e2a57173496d722a325ffd16af.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e35c9a35017d2fdcd10f76b4a776419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879ed18e2aaf5ef408be9e6ac8d9e30a.png)
您最近一年使用:0次
2022-05-30更新
|
1423次组卷
|
5卷引用:北京市东城区2022届高三下学期综合练习(三)数学试题
北京市东城区2022届高三下学期综合练习(三)数学试题(已下线)2022年新高考北京数学高考真题变式题13-15题(已下线)2022年新高考北京数学高考真题变式题19-21题北京卷专题18数列(解答题)(已下线)专题11 数列前n项和的求法 微点8 分组法求和
名校
7 . 对于给定的正整数
和实数
,若数列
满足如下两个性质:①
;②对
,
,则称数列
具有性质
.
(1)若数列
具有性质
,求数列
的前
项和;
(2)对于给定的正奇数
,若数列
同时具有性质
和
,求数列
的通项公式;
(3)若数列
具有性质
,求证:存在自然数
,对任意的正整数
,不等式
均成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47831e50ef2d068c6c5874304fd6404c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac657ea5bbf4b237a30e4074c76cc81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6314ea082d345042a5f60044b9da055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfd181a4137ab8a71da7f9ff815f063.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e73439b6e497593216e5625610b2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
(2)对于给定的正奇数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/197650aa3d6df43e074e656285923e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde821d2523d1cb8928dea513cbf2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfd181a4137ab8a71da7f9ff815f063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3a0d76c040de0117ed775630b99b10.png)
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2022-01-12更新
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1446次组卷
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9卷引用:北京市东城区2022届高三上学期期末统一检测数学试题
北京市东城区2022届高三上学期期末统一检测数学试题江西省新余市第一中学2021-2022学高二年级下学期开学考试数学(理)试题(已下线)高二数学下学期期末精选50题(压轴版)-2021-2022学年高二数学考试满分全攻略(人教A版2019选修第二册+第三册)北京市怀柔区第一中学2022-2023学年高二下学期期中考试数学试卷北京市东直门中学2024届高三上学期开学考试数学试题上海市复旦大学附属中学2023-2024学年高二上学期阶段性学业水平检测2(暨拓展考试6)数学试题北京市东城区第一六六中学2023-2024学年高二上学期期末模拟数学试题辽宁省辽东南协作体2023-2024学年高三下学期开学考试数学试题北京市北京师范大学附属实验中学2023-2024学年高二下学期期中考试数学试卷
20-21高三上·上海浦东新·阶段练习
名校
解题方法
8 . 设
是正整数,一个有限整数数列
,定义它的差集A为
构成的集合.
(1)求下列数列的差集A;
①1,2,3,4,5,6,7,8;
②1,2,4,8,16,32
(2)若
,
,求
的最大值和最小值;
(3)若
,并且
,求满足上述要求的整数列的个数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212c82587ab19801f2646fd69abc79e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0169119ec74ae04e129ed0046ae97dc6.png)
(1)求下列数列的差集A;
①1,2,3,4,5,6,7,8;
②1,2,4,8,16,32
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c7867969b14fd642147188b6ebf29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374445bb53a8d1c11c2e47f2a0c9e0ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc684a3a6aef07bfb1dff85792c2a1c3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/795c5b51ed46ce5ff453748652f0121c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f83fb5a9c7eeccc302a8a84ada9340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae48677f8f6e1eaa980756a18378e593.png)
您最近一年使用:0次
9 . 已知数列
,
,点
分布在一条方向向量为
的直线上,且
,
.请在①数列
的前
项和为
;②数列
的前
项和为
;③数列
的前
项和为
三个条件中选择一个,解答下列问题.
(1)求数列
,
的通项公式;
(2)求数列
的前
项和
.
![](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/fb6baeb1de3ad990688da587a1d9ca4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52c9237cb0b4acc568d4afb12997186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068b80e7b051fb12894987b75fb69da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2767882820f4ba0defde0e412adb747f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80b203420e0959ef52a2e4d2973d4fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec12a9a60f82467bf7bf834a9a9b1f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8b9256770dde0e7a880d12fde3e86e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71428c599dc3e3a46f690c5d3129d313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
名校
10 . 在某个周末,甲、乙、丙、丁四名同学相约打台球.四人约定游戏规则:①每轮游戏均将四人分成两组,进行组内一对一对打;②第一轮甲乙对打、丙丁对打;③每轮游戏结束后,两名优胜者组成优胜组在下一轮游戏中对打,同样的,两名失败者组成败者组在下一轮游戏中对打;④每轮比赛均无平局出现.已知甲胜乙、乙胜丙、丙胜丁的概率均为
,甲胜丙、乙胜丁的概率均为
,甲胜丁的概率为
.
(1)设在前三轮比赛中,甲乙对打的次数为随机变量X,求X的数学期望;
(2)求在第10轮比赛中,甲丙对打的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)设在前三轮比赛中,甲乙对打的次数为随机变量X,求X的数学期望;
(2)求在第10轮比赛中,甲丙对打的概率.
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