已知数列{an}满足an=2a(n-1)+2^n-1(n∈N+,且n>=2),a4=81(1)求数列的前三项a1,a2,a3;(2)数列{(an+p)/2^n}为等差数列,求实数p的值;(3)求数列{an}的前n项和S
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