已知数列an,bn中,a1=b1=1,且当n≥2时,an-nan-1=0,bn=2bn-1-
已知数列an,bn中,a1=b1=1,且当n≥2时,an-nan-1=0,bn=2bn-1-
已知等比数列an中,a1=2,a4=16,数列bn中,b1=1且bn-bn-1=log2an(n≥2),求bn
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∈
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
已知数列an,bn中,a1=0,b1=1,且当n为正整数时,an,bn,an+1成等差数列,bn,an+1,bn+1成等
数列{an}中a1=1 a(n+1)=2Sn + 1等差数列{bn}中bn大于0 b1+b2+b3=15且a1+b1,a
已知:bn=(a1+2a2+...+nan)/(1+2+...+n),数列an成等差数列的充要条件是bn也是等差数列.
已知数列{an}满足an+Sn=n,数列{bn}满足b1=a1,且bn=an-a(n-1),(n≥2),试求数列{bn}
已知数列an bn其中a1=1/2数列an的前n项和Sn=n^2an(n≥1) 数列bn满足b1=2 bn+1=2bn
已知数列bn,满足b1=1,b2=5,bn+1=5bn-6bn-1(n≥2),若数列an满足a1=1,an=bn(1/b
已知数列{an}满足a1=3,且an+1-3an=3n,(n∈N*),数列{bn}满足bn=3-nan.
数列{an}和{bn}中,a1=1,a2=2,an>0,bn=根号(an*a(n+1))(n为正整数),且{bn}是以q