已知数列an满足an+1=an+2*3n+1,a1=3,求数列an的通项公式
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已知数列an满足an+1=an+2*3n+1,a1=3,求数列an的通项公式
已知数列an满足an+1=an+2*3n+1,a1=3,求数列an的通项公式
已知数列an满足an+1=an+2*3n+1,a1=3,求数列an的通项公式
an+1=an+2*3n+1
=>an=a1+2*3*n(n-1)/2+(n-1)
=2+3n(n-1)+n
=3n^2-2n+2
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