（本小题满分12分）已知数列（1）求数列的通项公式；（2）求数列

答案

(Ⅰ) (Ⅱ)

解析:

（1）当； …1分

当…3分

， …4分

（2）令 …………5分

当；

当

综上， …………12分

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（本小题满分12分）已知数列（1）求数列的通项公式；（2）求数列

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