a1=2,an+1=2/3an+n-4 求an
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a1=2,an+1=2/3an+n-4 求an
![a1=2,an+1=2/3an+n-4 求an](/uploads/image/z/19520823-39-3.jpg?t=a1%3D2%2Can%2B1%3D2%2F3an%2Bn-4+%E6%B1%82an)
a(n+1)-3(n+1)+21=2(an-3n+21)/3
an-3n+21=(2/3)^(n-1)×(a1-3×1+21)
an=3n+20(2/3)^(n-1)-21
an-3n+21=(2/3)^(n-1)×(a1-3×1+21)
an=3n+20(2/3)^(n-1)-21
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