等差数列an的前n项的和为Sn,且满足a3=10,S7=91,数列{bn+1-bn}的公比为1/2的等比数列,且满足b1=1,b2=2(1)求数列{bn}的通项公式(2)记cn=a(n+1)b(n+1)-anbn,求数列{cn}中的最大项
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