先化简,再计算:(x^2-y^2)/(x-y)-2x+y,其中x=3,y=2
3个回答
展开全部
(x^2-y^2)/(x-y)-2x+y
=(x+y)(x-y)/(x-y)-2x+y
=x+y-2x+y
=2y-x
=2x2-3
=1
=(x+y)(x-y)/(x-y)-2x+y
=x+y-2x+y
=2y-x
=2x2-3
=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
(x^2-y^2)/(x-y)-2x+y
=(x+y)(x-y)/(x-y)-2x+y
=x+y-2x+y
=-x+2y
当x=3,y=2,得到原式=-3+4=1
=(x+y)(x-y)/(x-y)-2x+y
=x+y-2x+y
=-x+2y
当x=3,y=2,得到原式=-3+4=1
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