若数列an满足a1=2,a(n+1)=3an+2,求数列的通项公式n、（n+1）是下标.我只做到：构造出a(n+1)+X=3(an+X) ,a(n+1)=3an+2X,2X=2,X=1过程仔细、清晰点.三克油.

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