数列{an}满足a1=a ,a(n+1)=c×an +1-c ,n为正整数,c和a为实数,且c不等于0.（1）求{an}通项公式（2）设a=1/2 ,c=1/2 ,bn = n×（1-an）,求数列{bn}的前n项和Sn

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