fenshi

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/25 00:26:54

fenshi

1/[x(x+1)]+1/[(x+1)(x+1)]-1/[(x+2)(x+1)]-1/[(x+3)(x+1)]=1/(x+1)[1/x+1/(x+1)-1/(x+2)-1/(x+3)]=4/[x(x+1)(x+3)]

fenshi