等差数列An,Sn=na1+[n(n-1)]*d/2,类比等比数列Bn
问题描述:
等差数列An,Sn=na1+[n(n-1)]*d/2,类比等比数列Bn
答
Tn=(a1)^n*q^(1+n-1)n/2
Tn为Bn前n项积.