来自何钟琦的问题
已知数列{an}为等比数列,数列{bn}为等差数列,且a2a3=a5=32,b2+b3=b5=5.(Ⅰ)求数列{an},{bn}的通项公式;(Ⅱ)设数列{an}的前n项和为Sn,求和Tn=b1S1+b2S2+…+bnSn.
已知数列{an}为等比数列,数列{bn}为等差数列,且a2a3=a5=32,b2+b3=b5=5.
(Ⅰ)求数列{an},{bn}的通项公式;
(Ⅱ)设数列{an}的前n项和为Sn,求和Tn=b1S1+b2S2+…+bnSn.
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2020-11-1615:19