lim(n→∞) [a^(n+1)-2^(n-1)/a^(n-1)+2^(n+1)如题……另问:数列{an}中,a1=1,Sn是前n项和,当n≥2时,an=3Sn,则lim(n→∞)[Sn+1/S(n+1)-3]的值是?万分感谢T^T
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