问题描述: 请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6= 1个回答 分类:数学 2014-11-18 问题解答: 我来补答 =1/2×(1/1×2-1/2×3+1/2×3-1/3×4+1/3×4-1/4×5+1/4×5-1/5×6)=1/2×(1/1×2-1/5×6)=7/30 展开全文阅读