题型:名词解释 数列{an}的前n项和为Sn,且a1=2,an+1=13an+2n+53(n∈N+).(1)若等差数列{bn}恰好使数列{an+bn}成公比为13的等比数列,求通项bn(2)求通项an(3)求limn→∞Snn2的值. 查看答案
题型:名词解释 Let me()the case carefully before I draw a conclusion.A.look upB.look intoC.look afterD.look out 查看答案