问题描述: 1-1/3-1/9-1/27-1/81-1/243-1/729=? 1个回答 分类:数学 2014-12-06 问题解答: 我来补答 1-1/3-1/9-1/27-1/81-1/243-1/729=1-(1/3+1/9+1/27+1/81+1/243+1/729)=1-{(1/3)*[1-(1/3)^6]/[1-(1/3)]=1-[(728/729)/2]=1-(364/729)=365/729 展开全文阅读