数列{an}满足a1=a,An+1=cAn+1-c,n∈N*,其中a,c为实数,且c不等于0.(符号不会打````)(1)求数列{an}的通项公式.(2)设a=1/2,c=1/2 ,Bn=n(1-An),n∈N*,求数列{bn}的前n项和Sn.备注:An 和 Bn中的n
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