已知
、
、
为实数,对大于1的整数
都有
.
(1)若
、
、
成等差数列,求证:
、
、
也成等差数列;
(2)若
、
、
成等差数列,找一个反例,使
、
、
不成等差数列;
(3)对
,若
、
、
成等差数列,且公差不为0,问:
、
、
是否成等差数列?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b916856becb10588f9734f28eb02c8b4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36953850f9f4688e7af261d9fcbff945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d69e82b8469a7f001db0292913b477c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e008faa6dd8828d2c9e638b3b2a58d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a881309775c3b6a9f4ed408838666342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566f7614d51f0348db982a9440de8844.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8238eeb593f65d14a25a6c67f00fce31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2da4edc778c560d8f62b45a752c1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21337225fe08ff98725c6ab411a22e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b367f647833446cf684c3ddedb1592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f22f54a613a0e4889f1514656c4d22c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119c423d466df09a243b18f241873b75.png)
(3)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029da2067b3564cee13879e402a89a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848b8e2fa13f3977bcd302a64031efb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33e6b127aacb2a3acc3f5ee3eb6c380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502e5812933d4c9a32fa88139fcdd993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81baf482546f298ba289d723bc21e0c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8212e307836cb33f16575e23f6b808e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd44c2ae34921d515647486186cdeda.png)
2018高三·全国·竞赛 查看更多[1]
更新时间:2018-12-27 23:19:28
|
【知识点】 递归数列及性质
相似题推荐
解答题-证明题
|
困难
(0.15)
解题方法
【推荐1】设
为正整数,如果表达式
同时满足下列性质,则称之为“交错和”.①
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a717d685be4e0d53456f42e3cd401b.png)
;②
;③当
时,
(
);④规定:当
时,
也是“交错和”.
(1)请将7和10表示为“交错和”;
(2)若正整数
可以表示为“交错和”
,求证:
;
(3)对于任意正整数
,判断
一共有几种“交错和”的表示方法,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978be3cef71aa05b6ca98efb795dc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d70259b8ecc56afb8b3b15cf46082e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a717d685be4e0d53456f42e3cd401b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9b03740b24965e7196cbe91b82b252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e55143c8153a818863a3e5cf3cc6075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4cf5a951eef42eb9dff075e71210f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43649a490b881e3f7a5b6b7bee1a8b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59295942629ce535281d5066f14a65de.png)
(1)请将7和10表示为“交错和”;
(2)若正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978be3cef71aa05b6ca98efb795dc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7306bacb80799eeabd3fd46cb8632598.png)
(3)对于任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
【推荐2】对于正整数m,n,存在唯一的自然数a,b,使得
,其中
,我们记
.对任意正整数
,定义
的生成数列为
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874689ac8a6f70ecd93aa1aaf7d626f6.png)
.
(1)求
和
.
(2)求
的前3项.
(3)存在
,使得
,且对任意
成立.考虑
的值:当
时,定义数列
的变换数列
的通项公式为
当
时,定义数列
的变换数列
的通项公式为
若数列
和数列
相同,则定义函数
,其中函数
的定义域为正整数集.
(ⅰ)求证:函数
是增函数.
(ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad12b60594a6408ccc237cad2880088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ff38a5b95f1fb452d87fce9c80b1249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574aa06d3d4f9952157c60ec8f40b839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5914cd027a87542e12cfb0c92c0aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874689ac8a6f70ecd93aa1aaf7d626f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57dbb663375b927f3c00d1be3fda1508.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37dbd8745cf6246eea337a1bf91258c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87dc8de41005802093ae66c08f46a7a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926145a2b2232a88ceed6e69dc050265.png)
(3)存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7e9f86738335a22298559db41037a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623ebc0f0eba98e8f63b7cd982c11009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8144524289a76dadf88c02976acea2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf0ce448d146abfcd0bd689b925d168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c20d94765a05ee86edf370dd64fcff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5914cd027a87542e12cfb0c92c0aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d054e320d843bf0ca4a620519f75ebaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8121a889da1f3ecbecd5387a9473c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98b98330b62847c220ab2f127e11391.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5914cd027a87542e12cfb0c92c0aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d054e320d843bf0ca4a620519f75ebaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf19212dd24556423636ce37034cdf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d054e320d843bf0ca4a620519f75ebaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dbc1106da9238ec6300e13ca3d9b10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46498efb2e485c1172abe2189e498613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88ba8e1dc91318d8a9e1856d8ae080e.png)
(ⅰ)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88ba8e1dc91318d8a9e1856d8ae080e.png)
(ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee5e2ada7f1e99bf68508d21b8f6fb7.png)
您最近一年使用:0次