等差数列An,Bn的前n项和分别为Sn,Tn且Sn除以Tn等于(3n-1)/(2n+3),求a8除以b8的值
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等差数列An,Bn的前n项和分别为Sn,Tn且Sn除以Tn等于(3n-1)/(2n+3),求a8除以b8的值等差数列An,Bn的前n项和分别为Sn,Tn且Sn除以Tn等于(3n-1)/(2n+3),求
等差数列An,Bn的前n项和分别为Sn,Tn且Sn除以Tn等于(3n-1)/(2n+3),求a8除以b8的值
等差数列An,Bn的前n项和分别为Sn,Tn且Sn除以Tn等于(3n-1)/(2n+3),求a8除以b8的值
等差数列An,Bn的前n项和分别为Sn,Tn且Sn除以Tn等于(3n-1)/(2n+3),求a8除以b8的值
a8/b8=2a8/2b8=(a1+a15)/(b1+b15)
=[(a1+a15)/2]/[(b1+b15)/2]
=S15/T15=(3*15-1)/(2*15+3)
=44/33=4/3
s15=a1+a2+..+a15=(a1+a15)+(a2+a14)+...a8=15a8
t15=15b8
a8/b8=s15/t15=(3*15-1)/(2*15+3)=4/3
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