等差数列{an}的各项均为正数,a1=3,前n项和为Sn,{bn}为等比数列,b1=1,且b2*S2=64,b3*S3=960.求an,bn.求和1/S1+1/S2+...Sn

等差数列{an}的各项均为正数,a1=3,前n项和为Sn,{bn}为等比数列,b1=1,且b2*S2=64,b3*S3=960.求an,bn.求和1/S1+1/S2+...Sn
等差数列{an}的各项均为正数,a1=3,前n项和为Sn,{bn}为等比数列,b1=1,且b2*S2=64,b3*S3=960.
求an,bn.
求和1/S1+1/S2+...Sn

等差数列{an}的各项均为正数,a1=3,前n项和为Sn,{bn}为等比数列,b1=1,且b2*S2=64,b3*S3=960.求an,bn.求和1/S1+1/S2+...Sn
b2*S2=q*(3+3+d)=64
b3*S3=q^2*(9+3d)=960
解得,q=8,d=2(q=40/3时,a2