已知数列{an}满足a1=2,an=3a(n-1)+2,(n>=2),求证数列{a(n)+1}为等差数列挂号里面是下标
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已知数列{an}满足a1=2,an=3a(n-1)+2,(n>=2),求证数列{a(n)+1}为等差数列挂号里面是下标
已知数列{an}满足a1=2,an=3a(n-1)+2,(n>=2),求证数列{a(n)+1}为等差数列
挂号里面是下标
已知数列{an}满足a1=2,an=3a(n-1)+2,(n>=2),求证数列{a(n)+1}为等差数列挂号里面是下标
证:
an=3a(n-1)+2
an+1=3a(n-1)+3
an+1=3[a(n-1)+1]
所以an+1是以首项a1+1=2+1=3
公比q=3的等比数列.
wgahajjkk
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