数列an=(1/2)^n,数列{bn}满足 bn=3+log4an ,设Tn=|b1|+|b2|+...+|bn|,求T
数列 an=2n-1 设bn=an/3^n 求和tn=b1+..bn?
设bn=(an+1/an)^2求数列bn的前n项和Tn
数列an的前n项和为Sn,Sn=2an-1,数列bn满足b1=2,bn+1=an+bn.求数列bn的前n项和Tn
an=3*2^(n-1),设bn=n/an求数列bn的前n项和Tn
设数列an,bn分别满足a1*a2*a3...*an=1*2*3*4...*n,b1+b2+b3+...bn=an^2,
设数列{an},{bn},满足an=[lg(b1)+lg(b2)+...+lg(bn)]/n,证明{an}为等差数列的冲
已知数列bn满足bn=b^2n,其前n项和为Tn,求(1-bn)/Tn
若数列{an]满足前n项和Sn=2an-4,bn+1=an+2bn,且b1=2,求:bn;{bn}的前n项和Tn
已知等比数列{An}的前n项之和Sn=2^n+p 数列{Bn}满足Bn=log2An,求和:Tn=(b1)^2-(b2)
3.设数列{an}的前n项和Sn=2an-4(n∈N+),数列{bn}满足:bn+1=an+2bn,且b1=2.求{bn
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
数列an,满足Sn=n^2+2n+1,设bn=an*2^n,求bn的前n项和Tn