数列(an)满足a1=1,且8a(n+1)an -16a(n+1) +2an+5=0 ,记bn=1/an-0.5(n大于等于1)求数列(anbn)的通项公式及前n项和Sn (注:an为a的第n项,a(n+1)为a的第n+1项)
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