数列{an}满足an=2an-1+2^n+1(n为正整数,n≥2）,a3=27 (1)求a1,a2的值(2)记bn=1/2^n(an+t)(n为正整数)是否存在一个实数t,使数列{bn}为等差数列.若存在,求出实数t,若不存在,请说明理由.

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