该式an+1=an/an+3左右同时变为倒数得 1/a(n+1)=(an+3)/an 即1/a(n+1)=3/an+1 转化成1/a(n+1)+1/2=3(1/an+1/2) 又1/a1+1/2=1 因此数列{1/an+1/2}是以1为首项 3为公比的等比数列 即1/an+1/2=3^(n-1) 所以an=1/[3^(n-1)-1/2] 祝学习顺利
数列an满足a1=2 an+1=an/an+3 求an
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