已知数列{an},{bn}满足:a1=92,2an+1-an=6•2n,bn=a
题型:解答题
问题:
已知数列{an},{bn}满足:a1=
(Ⅰ)证明数列{bn}为等比数列.并求数列{an},{bn}的通项公式; (Ⅱ)记数列{an},{bn}的前n项和分别为Sn,Tn,若对任意的n∈N*都有
|
已知数列{an},{bn}满足:a1=
(Ⅰ)证明数列{bn}为等比数列.并求数列{an},{bn}的通项公式; (Ⅱ)记数列{an},{bn}的前n项和分别为Sn,Tn,若对任意的n∈N*都有
|