已知等差数列
与等比数列
满足
,
,
.
(1)求数列
,
的通项公式;
(2)若
,求证:
.
![](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/c528a7cdaf941c327989a194e429c48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e176bf5db8bc1f540796220a08d96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a72334b6680e5c994ca5f825062e19.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e712f42fa33fefef00795afaa26b3a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710044de63cdfc94812bafb3cc54b7c2.png)
2021·浙江·模拟预测 查看更多[2]
更新时间:2021-05-21 19:21:11
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相似题推荐
解答题-证明题
|
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名校
解题方法
【推荐1】已知数列
是首项为1的等差数列,数列
是公比不为1的等比数列,且满足
,
,
.
(1)求数列
、
的通项公式;
(2)令
,
,求证:对任意的
,都有
;
(3)若数列
满足
,
,记
,是否存在整数
,使得对任意的
都有
成立?若存在,求出
的值,若不存在,说明理由.
![](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/84672a737e1ba65228ffd2f0064a8c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40751e69baead4a0d5bea384aedfa6c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dbe8fa82ab04f0a4ba4ad1c570c9aa1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2865594c03cd3cfcbf3216cdbf08fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e59daed5a4b5c4c901b5377c8a768f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3164d3d5a50734a7cb4c3ac468c95372.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea6578afabc23f5d7041b88c3790dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614bac93e838d86d18422bed438368df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e29ca87519f5cce53df70352eb61a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfc635d85ba1a671159602cdba4c276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】已知
是各项均为正数的等比数列,
是等差数列,且
.
(I)求
和
的通项公式;
(II)设数列
满足
,求
;
(III)对任意正整数
,不等式
成立,求正数
的取值范围.
![](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/8e4d3c39a13061f3b050f7834a3025cc.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(II)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318c9296e22a2afbb029fff77e1862cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0942b565f1f5bf6e225e65efa61f86ea.png)
(III)对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2f5eaf255c214bff1d744654643d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-问答题
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【推荐1】定义函数
如:对于实数
(
,
),如果存在整数
,使得
,则
.
(1)若等差数列
满足:
,
,求数列
的通项公式;
(2)证明:函数
是奇函数且
;
(3)已知等比数列
具有单调性,其首项
,且
,求公比
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c89db96f71b6aa6fb6806323137561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a173784888adf2946382fa093ba53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7888c2e2b1c059ef97bee15ecf45328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce90064385c4633056784c1ae375a2d5.png)
(1)若等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1452330505ad23cf474b900b8624d613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbdafaf3f7e381133b8b5d67514ecf43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f795eefba1caf9a069ea1a0803692e8d.png)
(3)已知等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c76369f8989927b70e13650d984b66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
您最近一年使用:0次
【推荐2】已知数列
满足:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c3dbb4d6c179ffc3f61eeffa452c2a.png)
,
,且
.
(1)若
,求数列
的通项公式;
(2)若
,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c3dbb4d6c179ffc3f61eeffa452c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ea7ba6569f7942368a151283e5658e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c4e9e92b3cad18b4b6ecf67979cae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527bd6adefbb15deb6ad829d7584d072.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c656ffb75363e18d211963695739c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
【推荐1】已知数列
中,
,
.
(1)判断
是否为等比数列?并求
的通项公式;
(2)若
,求数列
的前
项和
.
![](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/bc8600e0eeaf7eb00d00753ce3dbf341.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caac9171d9c9708b59e432857fad0de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4885d870ccefe294bc465ce980a3d592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec4bdc2a6d4fc387dc621f0b5a268c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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【推荐2】已知数列
、
,其中,
,数列{bn}满足b1=2,bn+1=2bn.
(1)求数列
、
的通项公式;
(2)是否存在自然数
,使得对于任意
,
,有
恒成立?若存在,求出
的最小值;
(3)若数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddb9f59ac6af99a8e1db5c320b47fe0.png)
,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/60734a4b7cf9debb74bfbf11c21344cd.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)是否存在自然数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bfe867734006bfb312d74569337cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddb9f59ac6af99a8e1db5c320b47fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4758c6802380b1925192ab573b597f.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)
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解答题-证明题
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较难
(0.4)
解题方法
【推荐1】若数列{an}满足:对任意n∈N*,均有an=bn+cn成立,且{bn},{cn}都是等比数列,则称(bn,cn)是数列{an}的一个等比拆分.
(1)若an=2n,且(bn,bn+1)是数列{an}的一个等比拆分,求{bn}的通项公式;
(2)设(bn,cn)是数列{an}的一个等比拆分,且记{bn},{cn}的公比分别为q1,q2;
①若{an}是公比为q的等比数列,求证:q1=q2=q;
②若a1=1,a2=2,q1•q2=﹣1,且对任意n∈N*,an+13<anan+1an+2+an+2﹣an恒成立,求a3的取值范围.
(1)若an=2n,且(bn,bn+1)是数列{an}的一个等比拆分,求{bn}的通项公式;
(2)设(bn,cn)是数列{an}的一个等比拆分,且记{bn},{cn}的公比分别为q1,q2;
①若{an}是公比为q的等比数列,求证:q1=q2=q;
②若a1=1,a2=2,q1•q2=﹣1,且对任意n∈N*,an+13<anan+1an+2+an+2﹣an恒成立,求a3的取值范围.
您最近一年使用:0次
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解题方法
【推荐2】已知各项均为正数的数列
的前n项和满足
,且
.
(1)求
的通项公式:
(2)设数列
满足
,并记
为
的前n项和,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3f4f76c7bde482ebcaaab4bb59b0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015a269200ae193657d55f61e8b0bfda.png)
(1)求
![](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/742721845dbe4fcc82018b6ae15906ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a971a32e733960283abc7396bfc23912.png)
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