设数列,a1=3,an+1=3an-2,求数列an是等比数列
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设数列,a1=3,an+1=3an-2,求数列an是等比数列
设数列,a1=3,an+1=3an-2,求数列an是等比数列
设数列,a1=3,an+1=3an-2,求数列an是等比数列
a(n+1)=3an-2
a(n+1)-1=3an-3
a(n+1)-1=3(an-1)
[a(n+1)-1]/(an-1)=3
所以应该是an-1是等比数列,q=3
an=1+2*3^(n-1)
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