解题方法
1 . 已知
,集合
,把
中的元素从小到大依次排成一列,得到数列
.
(1)求数列
的通项公式;
(2)记
,设数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0badb4ea2dd1342dbb330e2e3cf5f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807064a3baca4be33b1e8da0484c3da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3ca44776d3240937c427c2cf6df97e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cfdb65957f38046b56d9ed2bc602bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e672c3d231081d12e44a4211e5ac60bf.png)
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2016-12-04更新
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3卷引用:2017届河南鹤壁高级中学高三理周练10.21数学试卷