Giúp mik vs cb ơi huhuh Cm rằng y/x-y-x^3-xy^2/x^2+y^2.(x/x^2-2xy+y^2-y/x^2-y^2)=1

1 bình luận về “Giúp mik vs cb ơi huhuh Cm rằng y/x-y-x^3-xy^2/x^2+y^2.(x/x^2-2xy+y^2-y/x^2-y^2)=1”

1. y/(x-y)-(x^3-xy^2)/(x^2+y^2).(x/(x^2-2xy+y^2)-y/(x^2-y^2)).đkxđ:xne+-y

   =y/(x-y)-(x(x^2-y^2))/(x^2+y^2).(x/(x-y)^2-y/((x-y)(x+y)))

   =y/(x-y)-(x(x-y)(x+y))/(x^2+y^2).(x(x+y)-y(x-y))/((x-y)^2(x+y))

   =y/(x-y)-(x(x^2+xy-xy+y^2))/((x-y)(x^2+y^2))

   =y/(x-y)-x/(x-y)

   =(y-x)/(x-y)

   =-1

    

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