设bn=an-1 ,则b1=1
a(n+1)-1=3an-3=3(an-1)
b(n+1)=3bn
q=3
bn=3^(n-1)=an-1
an=3^(n-1)+1
数列[An]满足a1=2,a（n+1）=3an-2 求an
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