数列{an}满足a1=2,an+1=2^(n+1)*an/((n+1/2)*an+2^n),(1)设bn=2^n/an,求bn(2)设Cn=1/n(n+1)an+1数列{an}满足a1=2,an+1=2^(n+1)*an/((n+1/2)*an+2^n),(1)设bn=2^n/an,求bn(2)cn=1/n(n+1)an,数列{cn}的n项和Sn,求出Sn,并由此证
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