1 . 设首项为1的正项数列{an}的前n项和为Sn,数列
的前n项和为Tn,且
,其中p为常数.
(1)求p的值;
(2)求证:数列{an}为等比数列;
(3)证明:“数列an,2xan+1,2yan+2成等差数列,其中x、y均为整数”的充要条件是“x=1,且y=2”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df45047a9d672dd8bc9086f1df20b321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd8c35ecd3777b7f6379575c5633f1a.png)
(1)求p的值;
(2)求证:数列{an}为等比数列;
(3)证明:“数列an,2xan+1,2yan+2成等差数列,其中x、y均为整数”的充要条件是“x=1,且y=2”.
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2 . 若数列
满足①
,②存在常数
与
无关),使
.则称数列
是“和谐数列”.
(1)设
为等比数列
的前
项和,且
,求证:数列
是“和谐数列”;
(2)设
是各项为正数,公比为q的等比数列,
是
的前
项和,求证:数列
是“和谐数列”的充要条件为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ff128b22e3abab2ba8f4d3012c33ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e19364ae7c7c56b2c27ffb7da111d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7207cae2e50fa00d0f79ca5d61aaa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055ac1dc6b870acc5d654f412e7f8ef2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36fc83ff481935ce22168c809930545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0519af3f19dde038fab2e68b5e2a5387.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0519af3f19dde038fab2e68b5e2a5387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c9b799432a92e9fa83ecdba7183f36.png)
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