已知
为等差数列,前
项和为
,
是首项为
的等比数列,且公比大于
,
,
,
.
(1)求
和
的通项公式;
(2)求数列
的前
项和
;
(3)设
,
为数列
的前
项和,求不超过
的最大整数.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff86be56090d576aad0c0945a6bd2bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbaed111f759d66a140168905f2026b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb0344eb6d3543a6c80803e85f60b26.png)
(1)求
![](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/ad4e296016620fc5dac3fcc871183f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d82e4c2294efbd33e1b268e9a0cec5.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46784beb9640fb16c3f69ea298404092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526d983bed8be2c14ce68d22e2a74622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d7e8fc9240ae214ea4e8c0902f3c3e.png)
更新时间:2019-12-12 14:50:40
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知数列
中,
.
(1)求证:
是等差数列;
(2)若
,且数列
的前
项和为
,求数列
的最小项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3356ab33856a54efe1e76b65c641d0a6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b191044f5c024f377d999910b78b422.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcec1d73a5e5d890f40587aa4931df87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b191044f5c024f377d999910b78b422.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/26d149b05d00b6ec8710e4f5fba50865.png)
您最近一年使用:0次
【推荐2】在如图三角形数阵中,第
行有
个数,
表示第
行第
个数,例如,
表示第4行第3个数.该数阵中每一行的第一个数从上到下构成以
为公差的等差数列,从第三行起每一行的数从左到右构成以
为公比的等比数列(其中
).已知
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/4e99d37b-dac4-428d-9c50-8e8e43b45dfc.png?resizew=231)
(1)求
及
;
(2)记
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fac8f1b6ea4a6aa0333703434a5907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c20bc8da04fbb4bfea4e412274dde2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69c0ef038f8a43d628e0788647ef1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8318b84a8cd7e21a8a45c5b5edfa703e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/4e99d37b-dac4-428d-9c50-8e8e43b45dfc.png?resizew=231)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164ae1d08f223df4fa8df94bad8edd57.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df4c17c7a50d25dae1b3a19c04f1dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知数列
满足
,
,若
,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73d56c0442eccb800e5b1d7222f150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0946b13cc360976aea85a222f66cc7f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】已知
为等差数列,公差
,
中的部分项
恰为等比数列,且公比为
,若
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40be942b8f57da6619d690bd44e1fe6.png)
(1)求
;
(2)求数列
的通项公式及其前
项之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081d2f66102a8501f5d263b7ab93cc06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaa992a449b828df0ff545e233b279b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3f138d5781de6ed164ae5aae6e42a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40be942b8f57da6619d690bd44e1fe6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24653e3a6150f8c0a5a99529163b3bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】设数列
是公比为正整数的等比数列,满足
,
,设数列
满足
,
.
(1)求数列
的通项公式;
(2)求证:数列
是等差数列,并求数列
的通项公式;
(3)已知数列
,设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ef35b21da4cd8130642539d8245f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eca31143bd0d0998129db6032e4be7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d4c5c20e3d92c9324dcbeee22d5157.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102abb18c888eb23d40708b97de140ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca213c8eb450dcc6660dee2f085c49d2.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)
您最近一年使用:0次
【推荐2】已知数列
的前n项和为
,
,且
.
(1)求数列
的通项公式;
(2)设数列
满足
,记
的前n项和为
.若
对任意
且
恒成立,求实数
的最小值.
![](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/c502a4336c00e223825c6b41f16987b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8d1241c0b727592a8a531c1f4c2793.png)
(1)求数列
![](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/c1858ce0c1b4f1923cb6c1334de1852e.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/1718ebfd18afb1e7c441b941c4279122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0a31b3956a520bbca0bbadefc90432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
【推荐1】设
,令
,
,
.
(1)求
,
的表达式,并猜想
;
(2)若数列
满足:
,求
的前
项和
;
(3)若数列
满足:
,求
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d01cb00904ee16178c7c35d7e0a8d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66a88cbaed58dcf9671ba9240359b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47758fd032883f8fbded2ca2fe374df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1e2de22cb8df73c6dd6e61139d8196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2430c6a0c0f234c67a19444d35cabe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89220eb96a4757f2988362bc04e80c9.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ff39d025facc3369b90ef865bb45ee.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/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251eaa81acf1ece9470a9d971d832c9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图所示,程序框图给出了无穷正项数列{an}满足的条件,且当
时,输出的
是
; 当
时,输出的S是
.
![](https://img.xkw.com/dksih/QBM/2015/3/18/1572017980325888/1572017985560576/STEM/c077da80c7d24b779f54f19013337b7e.png?resizew=368)
(1)试求数列{an}的通项公式
;
(2)试求当k=10时,输出的T的值.(写出必要的解题步骤)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e2fed5a0431d09b425fce5ab11acb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb2927659fc5b2b6c5ce1d97786c171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6226b263d7eaae99b449dd56410e841f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a38f063b0663e63c26f0656d47cb77.png)
![](https://img.xkw.com/dksih/QBM/2015/3/18/1572017980325888/1572017985560576/STEM/c077da80c7d24b779f54f19013337b7e.png?resizew=368)
(1)试求数列{an}的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)试求当k=10时,输出的T的值.(写出必要的解题步骤)
您最近一年使用:0次