问题描述: 50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1 1个回答 分类:数学 2014-11-18 问题解答: 我来补答 1/(50×51)+1/(51×52)+1/(53×54)+1/(54×55)=1/50-1/51+1/51-1/52+1/53-1/54+1/54-1/55=1/50-1/55=(55-50)/(50×55)=5/(50*55)=1/550 展开全文阅读