作业帮x^2-y^2/x+y-4x(x-y)+y^2/2x-y,过程有就OK
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x^2-y^2/x+y-4x(x-y)+y^2/2x-y,过程有就OK
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
过程有就OK
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,过程有就OK
(x^2-y^2)/(x+y)-(4x(x-y)+y^2)/(2x-y)
=(x-y)(x+y)/(x+y)-(4x^2-4xy+y^2)/(2x-y)
=(x-y)-(2x-y)^2/(2x-y)
=(x-y)-(2x-y)
=-x