1 . 设数列
满足性质P:
,
.
(1)①若
是等差数列,求
;
②是否存在具有性质P的等比数列
?
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68e04c89c1b2801bab59204af1a2167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae1b1156235558a3cd8374b83f0c8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6305ad084713a5bdf0ce24179051d4.png)
(1)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68e04c89c1b2801bab59204af1a2167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
②是否存在具有性质P的等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68e04c89c1b2801bab59204af1a2167.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881453de33145e36107881c9bb7a9f07.png)
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2 . 已知等比数列{an}满足:|a2-a3|=10,a1a2a3=125.
(1) 求{an}的通项公式;
(2) 求证:对任意正整数m都成立.
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20-21高二上·全国·课后作业
解题方法
3 . 已知等差数列
的首项为
,公差为
,等比数列
的首项为
,公比为
(其中
,
均为正整数).
(1)若
,
,求数列
,
的通项公式;
(2)对于(1)中的数列
和
,对任意
在
与
之间插入
个
,得到一个新的数列
,试求满足等式
的所有正整数
的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fe0f4e8a80a2840c0f6929a8a6351b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769fe52ac96348d3b12d23d06d702595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)对于(1)中的数列
![](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/31e36bff57bcfa86432b340e25e51d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233427826eb2233641fc3a9805f6d206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f0264a379802edcf7d2a030f02606e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a483e3607a353123da4b7a5b302e8350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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