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数列{an}中,若a1=1,an+1=2an+3 (n≥1),则该数列的通项an...

数列{an}中,若a1=1,an+1=2an+3 (n≥1),则该数列的通项an=          

 

=-3 【解析】由,即=2,所以数列{ +3}是以(+3) 为首项,以2为公比的等比数列,故+3=(+3),=-3.
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