1.{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+a5=21,a5+b3=13,求{an}{bn}的通项公式.2.求数列1,1/2,1/2,1/3,1/3,1/3,1/4,1/4,1/4,1/4,前100项的和.1应该是:.{an}是等差数列,{bn}是各项都为正数的
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