已知数列{an}和{bn},对一切正整数n都有：a1bn+a2bn-1+a3bn-2+…+anb1=3^(n+1)-2n-31.如果数列{bn}为常数列,bn=1,求数列{an}的通项公式；2.如果{an}的通项公式为an=n,求证数列{bn}为等比数列；3.如果数列{bn}为
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