1 . 设
是公比大于1的等比数列,
为数列
的前n项和.已知
,且
是
和
的等差中项.
(1)求数列
的通项公式;
(2)设
,数列
的前n项和为
,求证:
.
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ccdc17b603871d20843ffccca2df0ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911278aa8595846abac1972e1de59995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7131900393b9906bd6dcfe26ade2059f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0462c9dc4a0bd08a0ec1cc07f1d2f3e6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36925e53ab12172c7616b6d64b608b16.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/f9928e46511e601913619a427ded84a3.png)
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2020-01-04更新
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2卷引用:2020届辽宁省锦州市渤大附中、育明高中高三下学期开学摸底考试数学(文)试题
2 . 执行如图所示的程序框图,若输出
的值为
,则判断框内可填入的条件是
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625062942171136/1625885882417152/STEM/9f227f77-0808-4f13-b391-69fef82da321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d7f8159e39e6a5fb2c65f093ab13dc.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625062942171136/1625885882417152/STEM/9f227f77-0808-4f13-b391-69fef82da321.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-02-17更新
|
1266次组卷
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8卷引用:2020届辽宁省锦州市渤大附中、育明高中高三下学期开学摸底考试数学(文)试题