какое разложение на множители многочлена правильнее ?
(y-3x)^2+(x^2+y)(3x-y)=(y-3x)[y-3x-x^2-y]=(y-3x)(-3x-x^2)
или 
(y-3x)^2+(x^2+y)(3x-y)=(y-3x)[3x-y+-x^2+y]=х(х+3)(3х-у)
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