因为Sn=a1+an,S9/T9=a1+a9/b1+b9,所以a5/b5=a1+a9/2/b1+b9/2,得:S9/T9=a5/b9,即:a5/b5=7*9/n+3=21/4.
等差数列{a},{b}的前n项和,分别是Sn,Tn,且Sn/Tn=7n/n+3,则a5/b5=?
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