问题描述： 1/2+1/4+1/6+1/8+1/10+1/12.1/9900怎么算啊? 1个回答 分类：数学 2014-10-30 问题解答： 我来补答 原式=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/9-1/10 =1-1/10 =0.9 展开全文阅读
