赞 weishunmei 幼苗
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a(n+1)=3an +5*2^n +4
(a(n+1) + 5. 2^(n+1) + 2) = 3(an+ 5.2^n + 2 )
(a(n+1) + 5. 2^(n+1) + 2)/(an+ 5.2^n + 2 ) =3
(an+ 5.2^n + 2 )/(a1+ 12 ) = 3^(n-1)
an+ 5.2^n + 2 = 13. 3^(n-1)
an = 13. 3^(n-1) - 5.2^n - 2
(a(n+1) + 5. 2^(n+1) + 2) = 3(an+ 5.2^n + 2 )
(a(n+1) + 5. 2^(n+1) + 2)/(an+ 5.2^n + 2 ) =3
(an+ 5.2^n + 2 )/(a1+ 12 ) = 3^(n-1)
an+ 5.2^n + 2 = 13. 3^(n-1)
an = 13. 3^(n-1) - 5.2^n - 2
1年前
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