数列{an}满足a1=1,a(n+1)=2^(n+1)an/an+2^n(n∈N) (1)证明数列{2^n/an}是等差数列,

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数列{an}满足a1=1,a(n+1)=2^(n+1)an/an+2^n(n∈N) (1)证明数列{2^n/an}是等差数列,