设{an}是等差数列,{bn}是等比数列,且0

设{an}是等比数列,{bn}是等差数列,且b1=0,数列{cn}的前三项依次是1,1,2,且cn=an+bn 设{an}是等差数列，{bn}是等比数列，Sn、Tn分别是数列{an}、{bn}的前n项和.若a3=b3，a4=b4，且 已知等差数列｛an｝前n项和为Sn,公差d≠0,且S3+S5=50,a1,a4,a13,成等比数列 设{bn/an}是首 设{an}是等差数列,{bn}是等比数列,记{an}{bn}的前n项和分别为Sn,Tn若a3=b3,a4=b4,且（S5 设数列an是公差不为0的等差数列,Sn为其前n项和,数列bn为等比数列,且 设an为等比数列,bn为等差数列,b1=0,设cn=an+bn,且cn是1,1,2……,则cn前十项和为? 已知数列{an}是等差数列,且bn=2的an次方,求证数列{bn}是等比数列 设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+b3=13.求{an}, 设{an}是等差数列 {bn}是各项都为正数的等比数列,且a1=b1=1,a2+b3=a3+b2=7 (1)求{an}, 设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+a3=13.求[an}, 设{an}是等差数列,{bn}是各项都为正数的等比数列且a1=b1=1,a3+b5=21,a5+b3=13.求[an}, 设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13,求{an}