已知数列an的前n项和为Sn,且满足Sn=Sn-1/2Sn-1+1,a1=1/2(1)求证:1/Sn是等差数列(2
（2）求an的表达式
人气：257 ℃ 时间：2019-08-20 05:21:51
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