化简2x/(x^2-4)-1/(x-2) 20
5个回答
展开全部
2x/(x^2-4)-1/(x-2)
=2x/(x+2)(x-2)-(x+2)/(x+2)(x-2)
=(2x-x-2)/(x+2)(x-2)
=1/x+2
=2x/(x+2)(x-2)-(x+2)/(x+2)(x-2)
=(2x-x-2)/(x+2)(x-2)
=1/x+2
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
2013-05-05
展开全部
2x/(x^2-4)-1/(x-2)
=2x/[(x-2)(x+2)]-1/(x-2)
=1/(x-2)*[2x/(x+2)-1]
=1/(x-2)*(2x-x-2)/(x+2)
=1/(x+2)
=2x/[(x-2)(x+2)]-1/(x-2)
=1/(x-2)*[2x/(x+2)-1]
=1/(x-2)*(2x-x-2)/(x+2)
=1/(x+2)
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
2x/(x^2-4)-1/(x-2)
解:2x/(x+2)(x-2)-1/(x-2)
2x/(x-2)-1/(x-2)
1/(x-2)
解:2x/(x+2)(x-2)-1/(x-2)
2x/(x-2)-1/(x-2)
1/(x-2)
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