问题描述: 求1/x(x+1)+2/(x+1)(x+3)+3/(x+3)(x+6)的值 1个回答 分类:数学 2014-11-06 问题解答: 我来补答 1/x(x+1)+2/(x+1)(x+3)+3/(x+3)(x+6)=1/x-1/(x+1)+1/(x+1)-1/(x+3)+1/(x+3)-1/(x+6)= 1/x-1/(x+6)=(x+6-x)/[x(x+6)]=6/[x(x+6)] 展开全文阅读