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x^2-2xy+y^2 / x^2+4xy+3y^2
d expresado en factores = (x-y)^2
b expresado en factores = (x+y)(x+3y)
--> paso a paso de b: x(x+y) + (3xy+3y^2)
x(x+y) + 3y(x+y)
(x+y)(x+3y)
----------------------
x^2-2xy+y^2 / x^2+4xy+3y^2 = (x-y)^2/(x+y)(x+3y)
R = (x-y)^2/(x+y)(x+3y) -> no se puede reducir mas