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设数列{an}满足a1=2n,n∈N* (1)求数列{an}的通项公式; (2)设bn=nan,求数列{bn}的前n项和Sn.
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高一下学期数学《2017-2018学年海南省海南中学高一(下)期中数学试卷》真题及答案
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