x+y/x-y和y+x/y-x通分

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x+y/x-y和y+x/y-x通分x+y/x-y和y+x/y-x通分x+y/x-y和y+x/y-x通分(x+y)/(y-x)=-(x+y)/(x-y)移项{（x+y）+（x+y）}/(x-y)=02(

x+y/x-y和y+x/y-x通分
x+y/x-y和y+x/y-x通分

x+y/x-y和y+x/y-x通分
(x+y)/(y-x)=-(x+y)/(x-y)
移项
{（x+y）+（x+y）}/(x-y)=0
2(x+y)/(x-y)
分子分母同乘以（x+y)得
2（x+y）^2 /(x-y)(x+y)
化简得
(2x^2+4xy+y^2)/(x^2-y^2)

(x+y)/(y-x)=-(x+y)/(x-y),

∴公分母是(x-y)