小红同学在解答下列题时,给出了两种解法.

小红同学在解答下列题时,给出了两种解法.
解法一：x^2+y^2/x+y=(x+y)(x-y)/x+y=x-y
解法二：x^2-y^2/x+y=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/x^2-y^2=x-y
你认为小红同学的两种解法对吗?若解法错误,请说明理由.
分数没法打,凑合着看,帮个忙哈,
sorry,打错了,道个歉
小红同学在解答下列题时,给出了两种解法.
解法一：x^2-y^2/x+y=(x+y)(x-y)/x+y=x-y
解法二：x^2-y^2/x+y=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/x^2-y^2=x-y
你认为小红同学的两种解法对吗?若解法错误,请说明理由.
有错再提哈
无视x+y是否等于零,OK?