问题描述: x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 1个回答 分类:数学 2014-10-25 问题解答: 我来补答 />(x+2)/(x+1)-(x+3)/(x+2)-(x+4)/(x+3)+(x+5)/(x+4)=1+1/(x+1)-1-1/(x+2)-1-1/(x+3)+1+1/(x+4)=1/(x+1)-1/(x+2)-1/(x+3)+1/(x+4)=[(x+2)-(x+1)]/[(x+1)(x+2)]-[(x+4)-(x+3)]/[(x+3)(x+4)]=1/[(x+1)(x+2)]-1/[(x+3)(x+4)]=[(x+3)(x+4)-(x+1)(x+2)]/[(x+1)(x+2)(x+3)(x+4)]=(4x+10)/[(x+1(x+2)(x+3)(x+4)] 展开全文阅读