已知数列{an}是等差数列,数列{bn}是等比数列,a1=b1=1,若cn=an+bn,且c2=6,c3=11,求数列{
已知数列{an}是等差数列,数列{bn}是等比数列,a1=b1=1,若cn=an+bn,且c2=6,c3=11,求数列{
已知数列{an}是等差数列,a1=1,公差为2,又已知数列{bn}为等比数列,且b1=a1,b2(a2-a1)=b1,求
已知数列{an}是等比数列,数列{bn}是等差数列,且b1=a1,b3=a2,b7=a3,求数列{an}的公比
已知数列{an}是等差数列,且a1=1,公差为2,数列{bn}为等比数列且b1=a1,b2(a2-a1)=b1
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
已知数列{an}是等差数列,数列{bn}是等比数列,又a1=b1=1,a2b2=2,a3b3=7/4,(1)求数列{an
数列{an}是等差数列,{bn}是正项等比数列,且a1=b1=1,a3+b5=21,a5+b3=13,求{an}和{bn
已知等差数列{an}中,a1=1,a7=4,数列{bn}是等比数列,b1=6,b2=a3.
若数列{an},则有数列bn=a1+a2+a3+**an/n也为等差数列,数列{an}是等比数列,且cn>0,则有dn=
高三数列题:已知数列an是递增等差数列,bn是等比数列,且a1=1,b1=2,a4=b2,a8=b3↓
已知数列{an},如果数列{bn}满足b1=a1,bn=an+a(n-1)则称数列{bn}是数列{an}的生成数列
在数列{an},{bn}中,a1=2,b1=4且an,bn,an+1成等差数列,bn,an+1,bn+1成等比数列(n∈