设数列{an}满足a1=a,a(n+1)=can+1-c,n∈N+,其中a,c为实数,且c≠0.(1)设a=0.5,c=0.5,bn=n(1-an),n∈N+成立,求数列{bn}的前n项和Sn;(2)若0
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