已知数列{an}满足：a1=1,an+an+1=4n,Sn是数列{an}的前n项和；数列{bn}前n项的积为Tn,且Tn=2n(1-n)（1）求数列{an},{bn}的通项公式.麻烦帮我详细解说一下答案圈的式子怎么来的?

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