化简:1/x-1+1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)=?要过程
3个回答
展开全部
1/x-1+1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)
=1/(x-1)+[1/(x-2)-1/(x-1)]+[1/(x-3)-1/(x-2)]+[1/(x-4)-1/(x-3)]
=1/(x-1)+1/(x-2)-1/(x-1)+1/(x-3)-1/(x-2)+1/(x-4)-1/(x-3)
=1/(x-4)
提示:1/(x-1)(x-2)=1/(x-2)-1/(x-1)
=1/(x-1)+[1/(x-2)-1/(x-1)]+[1/(x-3)-1/(x-2)]+[1/(x-4)-1/(x-3)]
=1/(x-1)+1/(x-2)-1/(x-1)+1/(x-3)-1/(x-2)+1/(x-4)-1/(x-3)
=1/(x-4)
提示:1/(x-1)(x-2)=1/(x-2)-1/(x-1)
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
1/x-1+1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)=?
=1/(x-1)+[(1/(x-2)-1/(x-1)]+[(1/(x-3)-1/(x-2)]+[1/(x-4)-1/(x-3)]
=0+0+0+1/(x-4)
=1/(x-4)
=1/(x-1)+[(1/(x-2)-1/(x-1)]+[(1/(x-3)-1/(x-2)]+[1/(x-4)-1/(x-3)]
=0+0+0+1/(x-4)
=1/(x-4)
本回答被提问者采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
1/(x-1)+1/[(x-1)(x-2)]+1/[(x-2)(x-3)]+1/[(x-3)(x-4)]
=1/(x-1)+[1/(x-1)-1/(x-2)]+[1/(x-2)-1/(x-3)]+[1/(x-3)-1/(x-4)]
=2/(x-1)-1/(x-4)
=1/(x-1)+[1/(x-1)-1/(x-2)]+[1/(x-2)-1/(x-3)]+[1/(x-3)-1/(x-4)]
=2/(x-1)-1/(x-4)
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询